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  • 1
    Electronic Resource
    Electronic Resource
    Light-induced Activation of Cytoplasmic Protein Synthesis in Verticillium agaricinum (1975)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 34 (1975), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The level of protein synthetic activity in dark-grown cultures of Verticillium agaricinum was significantly enhanced by light. As expected the enhancement of protein synthetic activity was accompanied by a transformation of cytoplasmic monoribosomes to polyribosomes. Amino acid incorporation studies utilizing the synthetic mRNA, poly (U), suggest that the transformation was preceded by an activation of pre-existing ribosomes. The change in ribosome activity related, at least in part, to an increase in the level of peptidyl-tRNA associated with the ribosomes. In this regard the response of V. agaricinum ribosomes was similar to ribosome activation in several higher plant systems. The initial response at the level of the ribosome remains to be elucidated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1975.tb03820.x
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  • 2
    Electronic Resource
    Electronic Resource
    Light and Nitrate Requirements for Induction of Nitrate Reductase Activity in Hordeum vulgare (1970)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 23 (1970), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The importance of light to the induction of nitrate reductase activity in barley (Hordeum vulgare L.) was studied. Activity in etiolated leaves in darkness stayed at a low endogenous level even while large amounts of nitrate were actively accumulated. Light was required for any increase in activity, though the requirement may be satisfied to a limited extent before nitrate is available. Nitrate reductase activity was induced in the dark in green leaves which had not previously had nitrate but were supplied nitrate at the beginning of the dark period. If the nitrate then made available was sufficient, nitrate reductase activity increased until the effect of the previous light treatment was exhausted. Activity then decreased even though nitrate uptake continued. Upon returning the leaves to light, enzymatic activity increased again, as expected.Nitrate uptake was eliminated as an experimental variable by giving dark-grown plants nitrate, then detaching the leaves for induction studies. Under these conditions light saturation occurred between 3600 and 7700 lux at exemplary periods of illumination. At intensities of 3600 lux and above, activity increased sharply after a 6-hour lag period. As light intensity was decreased below 3600 lux the lag period became longer. Thus, when sufficient nitrate was available, the extent of induction of nitrate reductase activity was regulated by light.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1970.tb06461.x
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  • 3
    Electronic Resource
    Electronic Resource
    Corn and kidney bean root endoplasmic reticulum vesicles reduce a fungal iron chelate, ferrirhodotorulic acid, in vitro (1991)
    Springer
    Protoplasma 161 (1991), S. 160-167 
    Details
    ISSN: 1615-6102
    Keywords: Endomembranes ; Iron deficiency ; Siderophore
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Endoplasmic reticulum vesicles from both corn and kidney bean roots are capable of reducing ferrirhodotorulic acid, a fungal iron chelator, in vitro, using NADH as the reductant. In magnesium containing linear 15–45% sucrose density gradients, the activity was in a wide, high density band. The activity shifted in density to 1.07–1.08 when EDTA was included instead of magnesium. No plasma membrane reducing activity was found, even with iron deficient plants, using both NADH and NADPH as electron donors. It is speculated that the Eo′ value for ferrirhodotorulic acid, −0.36 V, may be too low for this chelate to be reduced by the iron deficiency induced iron chelate reductase found in the plasma membrane of nonpoaceous plants. Most of the activity was in the microsomal fraction rather than the soluble fraction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01322728
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  • 4
    Electronic Resource
    Electronic Resource
    Effect of NaCl and mannitol on plasma membrane proteins in corn roots (1990)
    Springer
    Protoplasma 155 (1990), S. 76-84 
    Details
    ISSN: 1615-6102
    Keywords: Endomembranes ; Protein synthesis ; Salt-stress
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The short-term effects of NaCl and mannitol stress on plasma membrane (PM) polypeptides from corn roots (Zea mays L.) were determined using two-dimensional gel electrophoresis following radiolabeled amino acid incorporation. After 2.5 hours, both stress treatments altered synthesis of several polypeptides. Changes included up-regulation of some polypeptides with concomitant down-regulation of others. Some changes were unique to the stress treatment while others were common to both NaCl and mannitol. No new polypeptides appeared in either case. Pulse-chase experiments following 0.5-hours and 2.5-hours incubation periods with radiolabeled amino acids did not reveal differences in turnover of PM polypeptides. The results support the contention that altered synthesis of PM proteins under stress may contribute to the alteration of membrane function.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01322617
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  • 5
    Electronic Resource
    Electronic Resource
    Plasma membrane phospholipid and sterol synthesis in soybean hypocotyl segments undergoing auxin-induced elongation (1995)
    Springer
    Protoplasma 185 (1995), S. 83-92 
    Details
    ISSN: 1615-6102
    Keywords: Auxin ; Cell elongation ; Phospholipid ; Plasma membrane ; Soybean ; Sterol
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Auxin-induced cell elongation necessitates plasma membrane enlargement. The effect of auxin (10 μM 2,4-dichlorophenoxyacetic acid) treatment on amount, composition, and rate of synthesis of plasma membrane lipids was examined. Auxin-treated and control soybean (Glycine max L.) hypocotyl segments were incubated with [14C]acetate for times ranging from 0.5 to 18 h, prior to isolation of plasma membrane by aqueous two-phase partitioning. The composition of individual plasma membrane lipids in elongating segments did not differ from the composition in treatment time-matched control segments, except that after longer auxin treatments, phospholipids had more unsaturated fatty acids. Plasma membrane phospholipid and free sterol content both increased in elongating segments. The relative proportion of sterols and phospholipids in the plasma membrane primarily depended on time after segment excision, for both auxin-treated and control segments. Auxin enhanced the rate of lipid incorporation into the plasma membrane by 6 h, and stimulated the synthesis of some phospholipids and sterols.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01272756
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  • 6
    Electronic Resource
    Electronic Resource
    Plasma membrane protein composition and synthesis in soybean hypocotyl segments undergoing auxin-induced elongation (1994)
    Springer
    Protoplasma 177 (1994), S. 144-152 
    Details
    ISSN: 1615-6102
    Keywords: Auxin ; Cell elongation ; Plasma membrane ; Protein synthesis ; Soybean
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The types and amount of plasma membrane proteins synthesized during cell elongation in response to auxin (2,4-dichlorophenoxyacetic acid) treatment were investigated. Auxin-treated and control soybean (Glycine max L.) hypocotyl segments were incubated with [35S]methionine for various times, ranging from 0.5 to 18 h, prior to isolation of plasma membrane by aqueous two-phase partitioning. Protein accumulated in the plasma membrane after auxin treatment. Despite this accumulation, the protein incorporation rate, estimated by the amount of label in the plasma membrane following a 0.5 h [35S]methionine pulse, was unaffected by auxin treatment at both 0.5 and 18 h of treatment. Protein apparently accumulated by a mechanism distinct from enhanced incorporation. The plasma membrane proteins synthesized by elongating segments differed from controls at 18 h, as evidenced by the pattern of fluorographs following a 0.5 h radiolabelling. However, auxin treatment did not alter the 2-D gel pattern of the polypeptides detectable by silver stain.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01378988
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  • 7
    Electronic Resource
    Electronic Resource
    Glycosylated polypeptides of soybean root endomembranes (1987)
    Springer
    Protoplasma 136 (1987), S. 125-135 
    Details
    ISSN: 1615-6102
    Keywords: Concanavalin A ; Endoplasmic reticulum ; Glycine max ; Glycoprotein ; Golgi ; Plasma membrane
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Endoplasmic reticulum, Golgi apparatus, plasma membrane and mitochondria vesicles were isolated from the roots of four-day-old dark-grown soybean [Glycine max (L.) Merr. cv. Wells II] seedlings and characterized by marker enzyme analyses. Glycoproteins of enriched membrane fractions were identified by concanavalin A (con A)-peroxidase staining of polypeptides separated by two-dimensional IEF-SDS-PAGE and transferred to nitrocellulose. Con A bound to many polypeptides in each endomembrane-enriched fraction with several glycopolypeptides common to all fractions. The mitochondria-enriched fraction possessed few glycopolypeptides and those appeared to be highly glycosylated contaminants of endomembrane origin. Comparison of the endomembrane con A-binding patterns revealed changes in relative stain intensity, molecular weight and isoelectric point of several membrane glycopolypeptides suggestive of processing reactions of the endomembrane complex.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01276361
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  • 8
    Electronic Resource
    Electronic Resource
    Soluble and membrane-associated heat shock proteins in soybean root (1990)
    Springer
    Protoplasma 156 (1990), S. 174-182 
    Details
    ISSN: 1615-6102
    Keywords: Endomembranes ; Endoplasmic reticulum ; Golgi apparatus ; Plasma membrane
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Localization of heat shock proteins (Hsp) in endomembranes and determination of whether they are integral or peripheral membrane proteins will aid in understanding the physiological function of the heat shock response. Radiolabeled endomembranes (endoplasmic reticulum, Golgi, and plasma membrane), obtained by sucrose gradient centrifugation of heat-shocked soybean (Glycine max L.) root tissue were solubilized and the polypeptides separated by two-dimensional IEF-SDS-PAGE. Autoradiography revealed three groups of Hsp. A diverse group fo 25 low mol wt Hsp (18 to 24 kDa) with isoelectric point (pI) between 5 and 7; an intermediate mol wt group (30 to 47 kDa) with pI of 5.5 to 6.0; and a group of two high mol wt Hsp (75 to 80 kDa) with pI 4.8 to 5.2. The plasma membrane fraction lacked the Hsp pair of 47 kDa detected in the endoplasmic reticulum and Golgi fractions but possessed a unique Hsp of 30 kDa, pI 5.5. Comparison of soluble and microsome fractions revealed a difference in the pattern of the low mol wt Hsp class. The soluble fraction contained Hsp of 16–20 kDa with pI between 5 and 7.8 while the microsome fraction was characterized by Hsp of 18–24 kDa with pI between 5.8 and 6.5. The microsomal Hsp were not released by 1 M KCl. Treatment of the microsome fraction with Triton X-100 selectively released several Hsp, and Na2CO3 treatment removed additional Hsp from the membrane fraction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01560655
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  • 9
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    Nitrate Uptake, Efflux, and In Vivo Reduction by Pima and Acala Cotton Cultivars (1997)
    Wiley
    Details
    Publication Date: 1997-11-01
    Print ISSN: 0011-183X
    Electronic ISSN: 1435-0653
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Published by Wiley
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  • 10
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    Paraheliotropic Leaf Movements in Mature Alfalfa Canopies 1 (1987)
    Wiley
    Details
    Publication Date: 1987-03-01
    Print ISSN: 0011-183X
    Electronic ISSN: 1435-0653
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Published by Wiley
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