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  • Articles  (15)
  • Zea  (15)
  • Springer  (15)
  • American Meteorological Society
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  • International Union of Crystallography
  • Springer Nature
  • Taylor & Francis
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  • 2000-2004
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  • 1980-1984  (15)
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  • 1980  (15)
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  • Biology  (15)
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  • Architecture, Civil Engineering, Surveying
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  • Articles  (15)
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  • Springer  (15)
  • American Meteorological Society
  • American Physical Society (APS)
  • International Union of Crystallography
  • Springer Nature
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  • 2000-2004
  • 1995-1999
  • 1980-1984  (15)
  • 1955-1959
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  • Biology  (15)
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  • 1
    Electronic Resource
    Electronic Resource
    Enzymes of nitrogen assimilation in maize roots (1980)
    Springer
    Planta 148 (1980), S. 477-484 
    Details
    ISSN: 1432-2048
    Keywords: Enzymes ; Nitrogen assimilation ; Root ; Zea
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The enzymes nitrate reductase (NR), glutamate dehydrogenase (GDH), glutamate synthase (GOGAT), glutamine synthetase (GS) and asparagine synthetase (AS) have been assayed in various regions along the seedling root ofZea mays L. In the intact attached root and calculated on a protein basis NR, GOGAT, and GS are found to have slightly higher specific activities in the apical 5 mm than in more mature regions of the root. GDH and AS, on the other hand, are much more active in extracts prepared from mature regions of the root than in the apical region. In excised root tips incubated in the presence of NH4 + and NO3 − there was a marked increase in GDH and AS, and a slight decrease in GOGAT and GS. Additions of NO3 − are required for NR activity but neither NO3 − nor NH4 + additions altered the activity levels of the other four enzymes. Additions of glucose to the medium inhibited the development of AS and GDH activities and resulted in higher activity levels of NR, GS and GOGAT. Glucose additions also enhanced the incorporation of acetate-14C and leucine-14C into protein. Additions of cycloheximide inhibit the development of NR, AS and GDH activities and also the incorporation of acetate-14C and leucine into protein.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02395318
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  • 2
    Electronic Resource
    Electronic Resource
    Auxin action on proton influx in corn roots and its correlation with growth (1980)
    Springer
    Planta 148 (1980), S. 510-512 
    Details
    ISSN: 1432-2048
    Keywords: Auxin ; Cell wall pH ; Growth (roots) ; Proton flux and growth ; Root growth ; Zea
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract At concentrations inhibitory to the elongation of corn (Zea mays L.) roots, the auxins, indole-3-acetic acid (IAA) and α-naphthaleneacetic acid (α-NAA), cause an increase in the pH of the bathing medium; this increase occurs with an average latent period shorter than the latent period for the inhibitory effect of these auxins on elongation. Indole-2-carboxylic acid, an inactive structural analogue of IAA, and β-naphthaleneacetic acid, an inactive analogue of α-NAA, affect neither growth nor the pH of the medium. Since acid pH is known to promote and basic pH to inhibit root elongation, the data are consistent with the hypothesis that hormone-induced modification of cell-wall pH plays a role in the control of elongation of roots, as has been proposed for elongation of stems and coleoptiles.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02395322
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  • 3
    Electronic Resource
    Electronic Resource
    The phytochrome system in light-grown Zea mays L. (1980)
    Springer
    Planta 149 (1980), S. 91-96 
    Details
    ISSN: 1432-2048
    Keywords: Light-grown plants ; Phytochrome ; SAN 9789 ; Zea
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The phytochrome system is analyzed in light-grown maize (Zea mays L.) plants, which were prevented from greening by application of the herbicide SAN 9789. The dark kinetics of phytochrome are not different in the first, second or third leaf. It is concluded that in light-grown maize plants phytochrome levels are regulated by Pr formation and Pfr and Pr destruction, rather than by Pfr→Pr dark reversion. Pr undergoes destruction after it has been cycled through Pfr. The consequences of this Pr destruction on the phytochrome system are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00386232
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  • 4
    Electronic Resource
    Electronic Resource
    pH-Dependent accumulation of indoleacetic acid by corn coleoptile sections (1980)
    Springer
    Planta 147 (1980), S. 457-466 
    Details
    ISSN: 1432-2048
    Keywords: Auxin (transport, accumulation) ; Chemiosmotic hypothesis ; Coleoptile ; Transport (auxin) ; Zea
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The uptake of auxin by 1-mm slices of corn (Zea mays L.) coleoptiles, a tissue known to transport auxin polarly, depends on the pH of the medium. Short-term uptake of indole-3-acetic acid (IAA) in coleoptiles increases with decreasing pH of the buffer as would be expected if the undissociated weak acid, IAA·H, were more permeable than the auxin anion, IAA-, and IAA- accumulates in the tissues because of the higher pH of the cytoplasm. Although uptake of [3H]IAA is reduced in neutral buffers, it is greater than expected if it were limited to just the extracellular space of the tissue. The radioactivity accumulated by the tissue can be quantitatively extracted by organic solvents and identified as IAA by thin-layer chromatography. The tissue radioactivity is freely mobile and can efflux from the tissue. Thus these cells in pH 5 buffer are able to retain an average internal concentration of mobile IAA that is at least several times greater than the external concentration. A prominent feature of auxin uptake from acidic buffers is enhanced accumulation at high auxin concentration. This indicates that, in addition to fluxes of IAA·H, a saturable site is involved in auxin uptake. Whenever the auxin-anion gradient is directed outward, saturating the efflux of auxin anions increases accumulation. Furthermore, the observed slowing of short-term uptake of radioactive IAA by increasing concentrations of IAA or K+ indicates either an activation of the presumptive auxin leak or saturation of another carrier-mediated uptake system such as a symport of auxin anions with protons. By contrast in neutral buffers, effects of concentration on uptake rates disappear. This implies that at neutral pH the anion leak is decreased and influx depends on the symport.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00380188
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  • 5
    Electronic Resource
    Electronic Resource
    Small RNA species in maize tissue (1980)
    Springer
    Planta 150 (1980), S. 406-411 
    Details
    ISSN: 1432-2048
    Keywords: Maize tissue ; RNA metabolism ; Small RNA species ; Zea
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The low molecular weight RNA components of maize have been analyzed after labeling callus and leaf tissue with [3H]uridine in vitro. Electrophoresis of the isolated RNA on acrylamide slab gels reveals, apart from 5S and transfer RNA, three major and about five minor RNA species with chain lengths between 140 and 280 nucleotides. These RNA molecules are labeled as rapidly as 5S, transfer RNA, and do not represent degradation products of large ribosomal RNA molecules. Furthermore, like 5S and transfer RNA, these small RNA species are stable and show no detectable turnover within forty-eight hours. Fractionation of the tissue into crude subcellular fractions indicates a preferential association of some of the small stable RNA species with the nucleus, while others appear to be located in the cytoplasm. The low molecular weight RNA spectrum from the leaf is similar to that observed in callus, with the major small RNA species equally present in both tissues.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00390177
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  • 6
    Electronic Resource
    Electronic Resource
    In vitro binding of riboflavin to subcellular particles from maize coleoptiles and Cucurbita hypocotyls (1980)
    Springer
    Planta 147 (1980), S. 312-319 
    Details
    ISSN: 1432-2048
    Keywords: Cucurbita ; Endoplasmic reticulum ; Light (blue) receptor ; Plasmalemma ; Riboflavin binding ; Zea
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Saturable and reversible in vitro binding of [14C]riboflavin was found to occur on subcellular, sedimentable particles from maize coleoptiles and Cucurbita hypocotyls. The KD was ca. 6 μM, the pH optimum was near 6.0, and the number of binding sites amounted to 0.1–0.5 μM on a fresh-weight basis. When the reducing agent dithionite was present, riboflavin binding increased-the KD was 2.5 μM, and the pH optimum above 8.0. The binding was specific: flavin mononucleotide (FMN) and flavin adenosine-dinucleotide (FAD) bound less tightly to these sites than riboflavin and another major soluble flavin, the previously described riboflavin-analog “FX”, occurring in grass coleoptiles. These flavin-binding sites were localized on vesicles derived from plasmalemma and endoplasmic reticulum by analyzing sucrose and metrizamide density gradients and marker enzymes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00379839
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  • 7
    Electronic Resource
    Electronic Resource
    Enzymes of nitrogen assimilation in maize roots (1980)
    Springer
    Planta 148 (1980), S. 477-484 
    Details
    ISSN: 1432-2048
    Keywords: Enzymes ; Nitrogen assimilation ; Root ; Zea
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The enzymes nitrate reductase (NR), glutamate dehydrogenase (GDH), glutamate synthase (GOGAT), glutamine synthetase (GS) and asparagine synthetase (AS) have been assayed in various regions along the seedling root ofZea mays L. In the intact attached root and calculated on a protein basis NR, GOGAT, and GS are found to have slightly higher specific activities in the apical 5 mm than in more mature regions of the root. GDH and AS, on the other hand, are much more active in extracts prepared from mature regions of the root than in the apical region. In excised root tips incubated in the presence of NH4 + and NO3 − there was a marked increase in GDH and AS, and a slight decrease in GOGAT and GS. Additions of NO3 − are required for NR activity but neither NO3 − nor NH4 + additions altered the activity levels of the other four enzymes. Additions of glucose to the medium inhibited the development of AS and GDH activities and resulted in higher activity levels of NR, GS and GOGAT. Glucose additions also enhanced the incorporation of acetate-14C and leucine-14C into protein. Additions of cycloheximide inhibit the development of NR, AS and GDH activities and also the incorporation of acetate-14C and leucine into protein.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00552663
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  • 8
    Electronic Resource
    Electronic Resource
    Auxin action on proton influx in corn roots and its correlation with growth (1980)
    Springer
    Planta 148 (1980), S. 510-512 
    Details
    ISSN: 1432-2048
    Keywords: Auxin ; Cell wall pH ; Growth (roots) ; Proton flux and growth ; Root growth ; Zea
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract At concentrations inhibitory to the elongation of corn (Zea mays L.) roots, the auxins, indole-3-acetic acid (IAA) and α-naphthaleneacetic acid (α-NAA), cause an increase in the pH of the bathing medium; this increase occurs with an average latent period shorter than the latent period for the inhibitory effect of these auxins on elongation. Indole-2-carboxylic acid, an inactive structural analogue of IAA, and β-naphthaleneacetic acid, an inactive analogue of α-NAA, affect neither growth nor the pH of the medium. Since acid pH is known to promote and basic pH to inhibit root elongation, the data are consistent with the hypothesis that hormone-induced modification of cell-wall pH plays a role in the control of elongation of roots, as has been proposed for elongation of stems and coleoptiles.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00552667
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  • 9
    Electronic Resource
    Electronic Resource
    Ca2+ transport in mitochondrial and microsomal fractions from higher plants (1980)
    Springer
    Planta 150 (1980), S. 1-8 
    Details
    ISSN: 1432-2048
    Keywords: Calcium uptake ; Microsomes ; Mitochondria ; Transport (Ca2+) ; Zea
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Mitochondria from etiolated corn possess a much greater Ca2+ uptake capacity per mg protein than microsomes from the same source. Differences in energy requirements, sensitivity to specific inhibitors, and sedimentation properties enabled us to study both Ca2+ uptake mechanisms without mutual contamination. The microsomal Ca2+ uptake does not vary much among different plants as compared to the mitochondrial Ca2+ uptake; this is also true for different organs of the same plant. Mitochondrial Ca2+ uptake is more dependent on the age of the seedlings than microsomal uptake, because of changes in active Ca2+ uptake activity rather than of changes in efflux. Intactness and the oxidative and phosphorylative properties of the mitochondria remained unchanged during this time period. Na+ and Mg2+ do not induce Ca2+ release from mitochondria.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00385606
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  • 10
    Electronic Resource
    Electronic Resource
    Effect of indoleacetic acid, abscisic acid, root tips and coleoptile tips on growth and curvature of maize roots (1980)
    Springer
    Planta 150 (1980), S. 32-36 
    Details
    ISSN: 1432-2048
    Keywords: Abscisic Acid ; Auxin ; Geotropism ; Root tip ; Zea
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The effect of externally applied indoleacetic acid (IAA) and abscisic acid (ABA) on the growth of roots of Zea mays L. was measured. Donor blocks of agar with IAA or ABA were placed laterally on the roots and root curvature was measured. When IAA was applied to vertical roots, a curvature directed toward the donor block was observed. This curvature corresponded to a growth inhibition at the side of the root where the donor was applied. When IAA was applied to horizontal roots from the upper side, normal geotropic downward bending was delayed or totally inhibited. The extent of retardation and the inhibition of curvature were found to depend on the concentration of IAA in the donor block. ABA neither induced curvature in vertical roots nor inhibited geotropic curvature in horizontal roots; thus the growth of roots was not inhibited by ABA. However, when, instead of donor blocks, root tips or coleoptile tips were placed onto vertical roots, a curvature of the roots was observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00385611
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