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  • Artikel  (20)
  • Artikel: DFG Deutsche Nationallizenzen  (20)
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  • Springer  (20)
  • American Chemical Society
  • Blackwell Publishing
  • 1980-1984  (20)
  • 1925-1929
  • 1983  (5)
  • 1980  (15)
  • 1925
  • Biologie  (20)
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  • Artikel: DFG Deutsche Nationallizenzen  (20)
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  • Springer  (20)
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  • Blackwell Publishing
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  • 1980-1984  (20)
  • 1925-1929
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  • 1
    Digitale Medien
    Digitale Medien
    Kinetics of the appearance of mRNA for light-harvesting chlorophyll a/b protein in polysomes of barley (1980)
    Springer
    Planta 148 (1980), S. 448-452 
    Details
    ISSN: 1432-2048
    Schlagwort(e): Chlorophyll protein ; Hordeum ; Photosynthesis (light harvesting) ; Poly(A)RNA ; Polysomes ; Thylakoid membranes
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Polysomes from dark-grown and illuminated barley seedlings were translated in cell-free systems. The translation products reacting with the antibody against the light-harvesting chlorophyll a/b protein (LHCP) were analyzed by polyacrylamide gel electrophoresis. It was found that, in addition to the precursor protein of LHCP, a product was obtained that co-migrated with the mature protein. Furthermore, the results show that the light-induced proly(A)RNA for LHCP is integrated into the polysomal complex without delay, indicating that the integration of LHCP into the membrane is controlled at a higher level of gene expression.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02395313
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  • 2
    Digitale Medien
    Digitale Medien
    The effect of differential root and shoot temperature on the nitrate reductase activity, assayed in vivo and in vitro in roots ofHordeum vulgare (barley) (1980)
    Springer
    Planta 148 (1980), S. 455-461 
    Details
    ISSN: 1432-2048
    Schlagwort(e): Carbohydrates (in roots) ; Hordeum ; Malate ; Nitrate reductase activity ; Temperature (and nitrate reductase activity)
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract There was a large increase in nitrate reductase activity (NAR) assayed both in vivo and in vitro in roots of barley plants (cv. Midas_ grown with roots at 10°C and shoots at 20°C, compared with whole plants grown at 20°C. There were diurnal fluctuations in NRA in roots from both treatments, but they were much greater in roots grown at 20°C, where NRA fell to a very low value in the dark period. The diurnal fluctuations in the malate content of the roots were also related to the root growth temperature. Plants with roots grown at the lower temperature had a higher malate content, especially in the dark period where it was 20 times greater than in plants with roots at 20°C. At all times there was a three-fold increase in soluble carbohydrate in cooled roots and diurnal fluctuations were much less pronounced than those of malate. Growth at low temperatures increased the total flux of amino N into the xylem sap and increased the proportion of reduced N in the total N flux. At certain times of day both 10°C- and 20°C-grown roots responded to exogeneous malate by increasing the flux of amino acid into the xylem sap, although this effect was always more pronounced in 20°C-grown roots.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02395315
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  • 3
    Digitale Medien
    Digitale Medien
    Mobilization of proline in the starchy endosperm of germinating barley grain (1980)
    Springer
    Planta 149 (1980), S. 149-154 
    Details
    ISSN: 1432-2048
    Schlagwort(e): Endosperm ; Germination (seeds) ; Hordeum ; Proline ; Reserve mobilization (seeds) ; Seed germination
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract In germinating grains of barley, Hordeum vulgare L. cv. Himalaya, free proline accumulated in the starchy endosperm during the period of rapid mobilization of reserve proteins. When starchy endosperms were separated from germinating grains and homogenized in a dilute buffer of pH 5 (the pH of the starchy endosperm), the liberation of proline continued in these suspensions. The process was completely inhibited by diisopropylfluorophosphate, indicating that it was totally dependent on serine carboxy-peptidases. The carboxypeptidases present in the starchy endosperms of germinating grains were fractionated by chromatography on DEAE-cellulose. Four peaks were obtained, all with different activity spectra on the seven carbobenzoxydipeptides (Z-dipeptides) tested. Two of the peaks corresponded to previously known barley carboxypeptidases; these as well as a third peak hydrolyzed substrates of the types Z-X-Y and Z-X-Pro (X and Y denote any amino acid residue except proline). The fourth peak corresponded to a proline carboxypeptidase specific for substrates of the Z-Pro-X type. Apparently, in the hydrolysis of longer proline-containing peptides there must be sequential cooperation between the two carboxypeptidase types. The carboxypeptidases in extracts of starchy endosperms also liberated proline from the peptides Ala-Ala-Ala-Pro and Ala-Ala-Pro while Ala-Pro and Pro-Ala were not attacked. The dipeptides, however, were rapidly hydrolyzed around pH 7 by extracts prepared from the scutella of germinating grains. It is concluded that one part of the proline residues of the reserve proteins is liberated in situ in the starchy endosperm through the combined action of acid proteinases and carboxypeptidases, while another part is taken up in the form of small peptides by the scutellum, where proline is liberated by amino- and/or dipeptidases in some “neutral compartment”.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00380876
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  • 4
    Digitale Medien
    Digitale Medien
    Nature of the phytochrome effect on the binding of glycolate oxidase to peroxisomes in vitro (1980)
    Springer
    Planta 149 (1980), S. 252-256 
    Details
    ISSN: 1432-2048
    Schlagwort(e): Glycolate oxidase ; Hordeum ; Phytochrome ; Peroxisomes
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract The attachment of glycolate oxidase to the peroxisomal fraction derived from etiolated barley leaves (Hordeum vulgare L. cr. Dvir) is affected by light. The effect of red irradiation is reversed by subsequent far-red irradiation, indicating the involvement of phytochrome. This phytochrome effect is assumed to be related to phytochrome binding. Indeed, prevention by filipin (1.2·10-6 mol g-1 f wt) or cholesterol of phytochrome binding to membranes abolishes the effect of light on the interaction between glycolate oxidase and the peroxisomal fraction. Glycolate oxidase binding is affected by addition of quasi-ionophores such as gramicidin and filipin at a concentration of 0.6·10-3 mol g-1 f wt. This fact indicates that peroxisome-glycolate oxidase interaction may be affected by membrane potential. Since both ion transport and membrane potential are known to be affected by phytochrome, it is proposed that phytochrome acts in the light-induced modulation of glycolate oxidase attachment as a quasi-ionophore.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00384561
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  • 5
    Digitale Medien
    Digitale Medien
    In vitro synthesis of barley storage proteins (1980)
    Springer
    Planta 149 (1980), S. 262-268 
    Details
    ISSN: 1432-2048
    Schlagwort(e): Hordeum ; Polyribosomes ; Protein synthesis ; RNA ; Seeds ; Storage proteins
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Membrane-bound polysomes were isolated from developing endosperms of barley (Hordeum vulgare L.) and shown to support the synthesis of trichloroacetic acid-insoluble material by an in vitro wheat germ protein synthesis system. The mRNA associated with the polysomes was separated from the ribosomes by affinity chromatography on oligo-dT cellulose and was also shown to support in vitro protein synthesis. The poly-A+ RNA isolated contained material of between 0.55 and 2.55 kilobases in length with about 6% poly A. The products of in vitro protein synthesis resembled hordeins (the prolamin storage proteins of the barley endosperm) in that they were predominantly soluble in 55% propan-2-ol, contained a low proportion of lysine as compared with leucine and had similar, but not identical, electrophoretic properties. The differences in the electrophoretic behaviour between the products of poly-A+ RNA translation and authentic hordeins is suggested to be due to the presence of an extra (leader?) sequence on the former.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00384563
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  • 6
    Digitale Medien
    Digitale Medien
    Differential expression of the genes for ribulose-1,5-bisphosphate carboxylase and light-harvesting chlorophyll a/b protein in the developing barley leaf (1980)
    Springer
    Planta 150 (1980), S. 41-45 
    Details
    ISSN: 1432-2048
    Schlagwort(e): Chlorophyll-protein ; Hordeum ; Leaf development ; Light-harvesting chlorophyll a/b protein ; mRNA ; Ribulose-1,5-bisphosphate carboxylase
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract The expression of genes in particular for light-harvesting chlorophyll a/b protein (LHCP) and ribulose-1,5-bisphosphate carboxylase (RuBPCase) has been studied in the developing barley leaf. This has been done by analysis of the occurrence of both proteins within the different regions (1 to 6, beginning from the base) of the primary 7-day-old leaf. It has been found that LHCP already appears in the base of the leaf, whereas RuBPCase is primarily expressed in the apical expanding part of the leaf. The distribution of the mRNAs for both proteins within this gradient is in accordance with that of the proteins themselves, indicating that gene expression is not regulated at the level of translation in both cases. The poly(A) mRNA for LHCP occurs mainly in the basic sections 2 and 3, whereas that for RuBPCase is found throughout the leaf but primarily in the apical sections of the leaf.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00385613
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  • 7
    Digitale Medien
    Digitale Medien
    The effect of differential root and shoot temperature on the nitrate reductase activity, assayed in vivo and in vitro in roots ofHordeum vulgare (barley) (1980)
    Springer
    Planta 148 (1980), S. 455-461 
    Details
    ISSN: 1432-2048
    Schlagwort(e): Carbohydrates (in roots) ; Hordeum ; Malate ; Nitrate reductase activity ; Temperature (and nitrate reductase activity)
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract There was a large increase in nitrate reductase activity (NAR) assayed both in vivo and in vitro in roots of barley plants (cv. Midas_ grown with roots at 10°C and shoots at 20°C, compared with whole plants grown at 20°C. There were diurnal fluctuations in NRA in roots from both treatments, but they were much greater in roots grown at 20°C, where NRA fell to a very low value in the dark period. The diurnal fluctuations in the malate content of the roots were also related to the root growth temperature. Plants with roots grown at the lower temperature had a higher malate content, especially in the dark period where it was 20 times greater than in plants with roots at 20°C. At all times there was a three-fold increase in soluble carbohydrate in cooled roots and diurnal fluctuations were much less pronounced than those of malate. Growth at low temperatures increased the total flux of amino N into the xylem sap and increased the proportion of reduced N in the total N flux. At certain times of day both 10°C- and 20°C-grown roots responded to exogeneous malate by increasing the flux of amino acid into the xylem sap, although this effect was always more pronounced in 20°C-grown roots.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00552660
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  • 8
    Digitale Medien
    Digitale Medien
    The isolation of endoplasmic reticulum from barley aleurone layers (1980)
    Springer
    Planta 150 (1980), S. 58-69 
    Details
    ISSN: 1432-2048
    Schlagwort(e): Aleurone ; α-Amylase ; Endoplasmic reticulum ; Hordeum ; Organelle isolation
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Techniques for the isolation and purification of endoplasmic reticulum (ER) from aleurone layers of barley (Hordeum vulgare L.) were assessed. Neither differential centrifugation nor density gradient centrifugation of a homogenate separate the ER or other organelles of this tissue from the lipidcontaining spherosomes. Isopycnic sucrose gradient centrifugation of organelles first purified by molecular sieve chromatography on Sepharose 4B, however, results in separation of the organelles based on their differing buoyant densities. Manipulation of the magnesium concentration of the isolation media and density-gradient solutions affords isolation of ER at a density of 1.13–1.14 g cc-1 and 1.17–1.18 g cc-1. Electron microscopy shows that the membranes sedimenting at 1.13–1.14 g cc-1 are devoid of ribosomes and are characteristic of smooth ER, while those sedimenting at 1.17–1.18 g cc-1 are studded with ribosomes and have the features of rough ER. Endoplasmic reticulum isolated by isopycnic density gradient centrifugation can be further purified by rate-zonal centrifugation.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00385616
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  • 9
    Digitale Medien
    Digitale Medien
    Quantitative and qualitative changes in the endoplasmic reticulum of barley aleurone layers (1980)
    Springer
    Planta 150 (1980), S. 70-81 
    Details
    ISSN: 1432-2048
    Schlagwort(e): Aleurone ; α-Amylase ; Endoplasmic reticulum ; Gibberellin ; Hordeum ; Organelle isolation
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Changes in the level of the endoplasmicreticulum (ER) marker enzyme cytochrome-c reductase (EC 1.6.2.1) were followed with time of imbibition of de-embryonated half-seeds of barley (Hordeum vulgare L.) and the subsequent incubation of their aleurone layers in gibberellic acid (GA3) and H2O. During imbibition there is an increase in the level of cytochrome-c-reductase activity and in the amount of 280-nm absorbance associated with this enzyme. When aleurone layers are incubated for a further 42 h in water, there is a doubling of the cytochrome-c-reductase activity. In GA3, the activity of cytochrome-c reductase reaches a maximum at 24 h of incubation and thereafter falls to below 70% of its level at the beginning of the incubation period. Changes in the cytochrome-c-reductase activity correlate with changes in the fine structure of the aleurone cell. The ER isolated in low Mg2+ from aleurone layers incubated in buffer for up to 18 h has buoyant density of 1.13–1.14 g cc-1 while that from layers incubated in GA3 for 7.5–18 h has a density of 1.11–1.12 g cc-1. The α-amylase (EC3.2.1.1) isolated with the organelle fraction by Sepharose gel filtration is associated with the ER on isopycnic and rate-zonal density gradients, and its activity can be enhanced by Triton X-100. The soluble α-amylase fraction from Separose-4B columns, on the other hand, is not Triton-activated but is acid-labile. Acid phosphatase (EC3.1.3.2) is distributed in at least three peaks on isopycnic gradients. In low Mg2+ the second peak of activity has a density of 1.12 g cc-1 in GA3-treated tissue and 1.13–1.14 g cc-1 in H2O-treated tissue. With high-Mg2+ buffers, this peak of phosphatase activity disappears. Acid-phosphatase activity is not enhanced by Triton X-100 nor is it acid-labile.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00385617
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  • 10
    Digitale Medien
    Digitale Medien
    The presence of phytochrome in purified barley etioplasts and its in vitro regulation of biologically-active gibberellin levels in etioplasts (1980)
    Springer
    Planta 148 (1980), S. 312-318 
    Details
    ISSN: 1432-2048
    Schlagwort(e): Etioplast ; Gibberellin ; Hordeum ; Phytochrome
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Data are presented confirming that purified barley etioplasts contain, or have associated with them, consistently detectable amounts of photoreversible phytochrome. Etioplasts, separated from mitochondrial contamination by sucrose gradient centrifugation, respond in vitro to red light treatment by an increase in the level of extractable gibberellin-like substances. It is concluded that earlier reports of the substances. It is concluded that earlier reports of the phytochrome regulation of biologically-active gibberellin levels in crude plastid fractions represent responses of the etioplast alone.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00388117
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  • 11
    Digitale Medien
    Digitale Medien
    Primer dependent and independent forms of soluble starch synthetase from developing barley endosperms (1980)
    Springer
    Planta 148 (1980), S. 412-416 
    Details
    ISSN: 1432-2048
    Schlagwort(e): α-Glucan ; Hordeum ; Starch synthetase
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract The activity of soluble starch synthetase (ADP-glucose: α-1,4-glucan α-4-glucosyltransferase) in the non-purified extract from 16 day-old Bomi barley endosperms (Hordeum vulgare L.) was low and the reaction was non-linear when plotted against protein concentration. Starch synthetase was purified by ammonium sulfate precipitation and DEAE-cellulose chromatography and separated into four fractions. In the absence of an added carbohydrate primer two of the four fractions catalized the synthesis of a methanol-precipitable α-glucan when high concentrations of sodium citrate and bovine serum albumim were added. The rate of α-glucan synthesis by the unprimed reaction was higher than for the primed reaction. The four enzyme fractions were active with ADP-Glc, but not with UDP-Glc, both in the primed and in the unprimed reaction.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00388131
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  • 12
    Digitale Medien
    Digitale Medien
    Kinetics of the appearance of mRNA for light-harvesting chlorophyll a/b protein in polysomes of barley (1980)
    Springer
    Planta 148 (1980), S. 448-452 
    Details
    ISSN: 1432-2048
    Schlagwort(e): Chlorophyll protein ; Hordeum ; Photosynthesis (light harvesting) ; Poly(A)RNA ; Polysomes ; Thylakoid membranes
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Polysomes from dark-grown and illuminated barley seedlings were translated in cell-free systems. The translation products reacting with the antibody against the light-harvesting chlorophyll a/b protein (LHCP) were analyzed by polyacrylamide gel electrophoresis. It was found that, in addition to the precursor protein of LHCP, a product was obtained that co-migrated with the mature protein. Furthermore, the results show that the light-induced proly(A)RNA for LHCP is integrated into the polysomal complex without delay, indicating that the integration of LHCP into the membrane is controlled at a higher level of gene expression.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00552658
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  • 13
    Digitale Medien
    Digitale Medien
    Symplasmic and apoplasmic radial ion transport in plant roots (1980)
    Springer
    Planta 148 (1980), S. 130-137 
    Details
    ISSN: 1432-2048
    Schlagwort(e): Hordeum ; Ion localization ; Ion uptake ; Plasmolysis ; Symplast uptake (ions)
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract The kinetics and localization of Rb+ uptake by barley roots were studied as function of the water potential of the medium. At potentials causing plasmolysis, uptake is reduced and becomes restricted to the outer surface of the root. The conclusion is that, at least for Rb+ in the range of low external concentrations (〈1 mM), the mature root cortex has little if any primary absorption1 capacity. Therefore, the apoplasmic pathway is of little or no significance for radial transport, which occurs by primary absorption at the epidermis and — perhaps — hypodermis followed by symplasmis transport to and through the cortex. Young cortex cells possess a primary absorption capacity comparable to that of the epidermis, but this feature is (largely) lost during differentiation.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00386413
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  • 14
    Digitale Medien
    Digitale Medien
    The assimilation of ammonium by barley roots (1983)
    Springer
    Planta 159 (1983), S. 483-486 
    Details
    ISSN: 1432-2048
    Schlagwort(e): Ammonium assimilation ; Glutamate dehydrogenase ; Hordeum ; NH 4 + assimilation
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Enzyme assays of the roots of barley (Hordeum vulgare L.) fed NH 4 + show high glutamate-dehydrogenase (GDH; EC 1.4.1.3) activity compared with glutamine-synthetase (GS; EC 6.3.1.2) activity, indicating that GDH may be involved in ammonium assimilation in the root. When 15NH 4 + is fed to barley roots, a high accumulation of 15N takes place in free amino compounds, particularly glutamine and glutamate. When the GS inhibitor, methionine sulfoximine (MSO), is added to the 15NH 4 + feeding medium the free amino compounds remain unlabelled while 15NH 4 + accumulates rapidly in the roots. Root enzyme assays demonstrate that GS is completely inhibited by MSO treatment, while the activity of GDH remains unaffected. The feeding of 15N-amido glutamine to the roots in the presence of MSO and the subsequent 15N enrichment of the free amino compounds of the root show that MSO does not interfere substantially with nitrogen assimilation after the formation of glutamine. These results indicate that in the barley root, ammonium absorbed from the soil is assimilated entirely via the GS-glutamate synthase (GOGAT) pathway, and that GDH plays little, if any, part in this process.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00409136
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  • 15
    Digitale Medien
    Digitale Medien
    Translocation and metabolism of glycine betaine by barley plants in relation to water stress (1980)
    Springer
    Planta 150 (1980), S. 191-196 
    Details
    ISSN: 1432-2048
    Schlagwort(e): Betaine ; Hordeum ; Water stress
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract The glycine betaine which accumulated in shoots of young barley plants (Hordeum vulgare L.) during an episode of water stress did not undergo net destruction upon relief of stress, but its distribution among plant organs changed. During stress, betaine accumulated primarily in mature leaves, whereas it was found mainly in young leaves after rewatering. Well-watered, stressed, and stressed-rewatered plants were supplied with [methyl-14C]betaine (8.5 nmol) via an abraded spot on the second leaf blade, and incubated for 3 d. In all three treatments the added 14C migrated more or less extensively from the second leaf blade, but was recovered quantitatively from various plant organs in the form of betaine; no labeled degradation products were found in any organ. When 0.5 μmol of [methyl-14C]betaine was applied via an abraded spot to the second leaf blades of well-watered, mildly-stressed, and stressed-rewatered plants, 14C was translocated out of the blades at velocities of about 0.2–0.3 cm/min which were similar to velocities found for applied [14C]sucrose. Heat-girdling of the sheath prevented export of [14C]betaine from the blade. When 0.5 μmol [3H]sucrose and 0.5 μmol [14C]betaine were suppled simultaneously to second leaf blades, the 3H/14C ratio in the sheath tissue was the same as that of the supplied mixture. After supplying tracer [14C]betaine aldehyde (the immediate precursor of betaine) to the second leaf blade, the 14C which was translocated into the sheath was in the form of betaine. Thus, betaine synthesized by mature leaves during stress behaves as an inert end product and upon rewatering is translocated to the expanding leaves, most probably via the phloem. Accordingly, it is suggested that the level of betaine in a barley plant might serve as a useful cumulative index of the water stress experienced during growth.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00390825
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  • 16
    Digitale Medien
    Digitale Medien
    The effect of light on the biosynthesis of the light-harvesting chlorophyll a/b protein (1980)
    Springer
    Planta 150 (1980), S. 426-430 
    Details
    ISSN: 1432-2048
    Schlagwort(e): Chlorophyll a/b protein, synthesis ; Hordeum ; Light-harvesting chlorophyll protein ; Phytochrome
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract The effect of light on the biosynthesis of the light-harvesting chlorophyll a/b protein (LHCP) is investigated in wild-type barley (Hordeum vulgare L.) and in the chlorophyll b-less mutant chlorina f2. In dark-grown plants a short red light pulse triggers the appearance of mRNA activity for the LHCP. While the accumulation of this mRNA is controlled by phytochrome (Apel (1979) Eur. J. Biochem. 97, 183–188), the red light treatment is not sufficient to induce the appearance of the LHCP within the membrane. Thus, at least one of the subsequent steps in the biosynthetic pathway leading to the assembly of the LHCP is controlled by light. The red light-induced mRNA is taken up into the polysomes during the subsequent dark period and is translated in vitro in a cell-free protein synthesizing system. However, an accumulation of the freshly synthesized polypeptide within the plant is not observed. The apparent instability of the polypeptide might be explained by the deficiency of chlorophyll in the red light-treated plants. In the chlorophyll b-less barley mutant chlorina f2 an accumulation of the freshly synthesized apoprotein of the LHCP can be observed in the light. Thus, chlorophyll a formation seems to be a light-dependent step which is required for the stabilization of the LHCP.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00390180
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  • 17
    Digitale Medien
    Digitale Medien
    Chromosome elimination in Hordeum vulgare x H. bulbosum hybrids (1983)
    Springer
    Theoretical and applied genetics 66 (1983), S. 141-146 
    Details
    ISSN: 1432-2242
    Schlagwort(e): Hordeum ; Stable hybrids ; Chromosome elimination ; Chromosome stability ; Gene balance
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary The hybrid progeny from a stable amphidiploid of H. vulgare x H. bulbosum involving the cultivar ‘Vada’ and an unstable amphidiploid involving the cultivar ‘Emir’ were studied. The genotypes examined contained two genomes from ‘Vada’ or one from ‘Vada’ and one from ‘Emir’, with one or two genomes from H. bulbosum. Comparisons between the chromosome numbers in root-tips and anthers revealed that there was no chromosome elimination in most plants, whether there was one or two Vada genomes present. The one plant in which chromosome elimination was positively identified had ‘Emir’ as opposed to ‘Vada’ cytoplasm. It also had a high incidence of degraded or fragmented chromosomes in the PMCs. Differences in stability between a 27 chromosome plant and other hypotetraploids suggest that ‘Vada’ contains both elimination genes and elimination suppressor genes. Upon selfing, again irrespective of the number of ‘Vada’ genomes present, circa triploid hybrids gave rise to diploid H. vulgare offspring while hypotetraploids produced hybrid-like plants. These included diploids, triploids and tetraploids. There was evidence that suggested that H. vulgare as well as H. bulbosum chromosomes had been eliminated.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00265189
    Standort Signatur Erwartet Verfügbarkeit
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  • 18
    Digitale Medien
    Digitale Medien
    Chromosome elimination in Hordeum vulgare x H. bulbosum hybrids (1983)
    Springer
    Theoretical and applied genetics 66 (1983), S. 135-140 
    Details
    ISSN: 1432-2242
    Schlagwort(e): Hordeum ; Amphidiploids ; Chromosome elimination ; Chromosome stability ; Gene balance
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary Both diploid and tetraploid hybrids of Hordeum vulgare x H. bulbosum exhibit chromosome instability during plant development and generally lose the H. bulbosum chromosomes by the next generation. However an amphidiploid involving the cultivar ‘Vada’ was found to retain the bulbosum chromosomes through a sexual cycle. Comparisons were made between this stable amphidiploid and a second, unstable amphidiploid involving the cultivar ‘Emir’. At meiosis there was a wide range of chromosome numbers in the ‘Emir’ amphidiploid but only a narrow range in the ‘Vada’ amphidiploid. Degraded chromosomes were commonly found in the PMCs of the ‘Emir’ amphidiploid but none was found in the stable ‘Vada’ amphidiploid. The two amphidiploids were reciprocally crossed and the chromosome numbers of the progeny checked. The H. bulbosum chromosomes had been retained in many of the progeny and both triploid and tetraploid hybrids were found. It is proposed that a gene(s) exists in ‘Vada’ capable of preventing the elimination of bulbosum chromosomes from H. vulgare x H. bulbosum hybrids.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00265188
    Standort Signatur Erwartet Verfügbarkeit
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  • 19
    Digitale Medien
    Digitale Medien
    RuBP carboxylase determination by enzymic estimation of D-3-PGA formed (1983)
    Springer
    Photosynthesis research 4 (1983), S. 145-149 
    Details
    ISSN: 1573-5079
    Schlagwort(e): coupled enzymes ; enantiomers ; Hordeum ; spectrophotometric assay ; radiometric assay
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract RuBPcarboxylase activity was measured in extracts of barley (Hordeum Vulgare L., cv. HOP) seedlings both with the standard radiometric method and by measuring D-3-phosphoglyceric acid formed enzymically in a two stage assay. In the different conditions used, characterized by different NaHCO3 concentrations, different pH and the presence and absence of oxygen, essentially the same ratio of D-3-PGA formed per 14CO2 fixed was obtained. This ratio respected the known stoichiometry of two molecules of D-3-PGA formed per CO2 fixed. It is suggested that measurement of D-3-PGA enzymically in a two stage assay can be routinely used for the determination of RuBP case activity instead of the radiometric method. The advantages and the validity of the method are discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00052376
    Standort Signatur Erwartet Verfügbarkeit
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  • 20
    Digitale Medien
    Digitale Medien
    RuBP carboxylase determination by enzymic estimation of D-3-PGA formed (1983)
    Springer
    Photosynthesis research 4 (1983), S. 145-149 
    Details
    ISSN: 1573-5079
    Schlagwort(e): coupled enzymes ; enantiomers ; Hordeum ; spectrophotometric assay ; radiometric assay
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract RuBPcarboxylase activity was measured in extracts of barley (Hordeum Vulgare L., cv. HOP) seedlings both with the standard radiometric method and by measuring D-3-phosphoglyceric acid formed enzymically in a two stage assay. In the different conditions used, characterized by different NaHCO3 concentrations, different pH and the presence and absence of oxygen, essentially the same ratio of D-3-PGA formed per 14CO2 fixed was obtained. This ratio respected the known stoichiometry of two molecules of D-3-PGA formed per CO2 fixed. It is suggested that measurement of D-3-PGA enzymically in a two stage assay can be routinely used for the determination of RuBP case activity instead of the radiometric method. The advantages and the validity of the method are discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00041810
    Standort Signatur Erwartet Verfügbarkeit
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