Results 91 to 100 of about 3,016 (118)
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Some aspects of geotropism in coleoptiles
Planta, 1970Auxin transport was studied in coleoptile sections that were stimulated geotropically. The early time course of auxin-transport asymmetry was measured. An initial phase in which more IAA was delivered into the receptor for the upper half was found after 5 min of horizontal exposure.
B, Filner, R, Hertel, C, Steele, V, Fan
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Expansins and coleoptile elongation in wheat
Protoplasma, 2008Expansins are now generally accepted to be the key regulators of wall extension during plant growth. The aim of this study was to characterize expansins in wheat coleoptiles and determine their roles in regulating cell growth. Endogenous and reconstituted wall extension activities of wheat coleoptiles were measured. The identification of beta-expansins
Qiang, Gao +5 more
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Glucanase activity in coleoptiles of Avena
Archives of Biochemistry and Biophysics, 1969Abstract The presence of five different β-glucanases has been investigated in coleoptiles of Avena with the use of specific substrates. A high activity of β-1,3-glucanase is found associated with the coleoptiles. With regard to β-1,4-glucanase activity a strong activity of exo -cellulase which splits glucose (or cellobiose) from the end of the ...
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Polyamines and Anaerobic Elongation of Rice Coleoptile
Plant and Cell Physiology, 1989Description d'une difference dans le metabolisme des polyamines entre des coleoptiles de riz poussant en conditions aerobie et anaerobie. En condition anaerobie, on observe une accumulation de putrescine libre. L'utilisation de putrescine exogene et d'inhibiteurs de la synthese des polyamines a permis de demontrer la necessite de ces substances pour l ...
Reggiani R, Hochkoeppler A, Bertani A
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Plastids of the Avena Coleoptile
Nature, 1960PHOTOTROPIC curvature of the Avena coleoptile may, for reasons which have been summarized elsewhere1, be mediated through the plastids. Geotropic curvature may have a similar basis, for it has long been thought2,3 that the geotropic responses of both shoots and roots are mediated by special starch grains or ‘statoliths’, and these in fact are plastids ...
HELEN P. SOROKIN, KENNETH V. THIMANN
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American Journal of Botany, 1949
probably more than elsewhere in the hierarchy of taxonomic categories, nomenclature and phylogeny come in close contact and are frequently in conflict. This instability in the application of nomenclaturally safe designations for many higher categories is hardly more desirable than it is with regard to the lower categories. New systems of classification
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probably more than elsewhere in the hierarchy of taxonomic categories, nomenclature and phylogeny come in close contact and are frequently in conflict. This instability in the application of nomenclaturally safe designations for many higher categories is hardly more desirable than it is with regard to the lower categories. New systems of classification
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Surface charge on isolated maize-coleoptile amyloplasts
Planta, 1983Whole amyloplasts were isolated from Zea mays L. coleoptiles. Electron microscopy confirmed that their envelopes consisted of two intact membranes. Their surface charge was quantified through electrokinetic measurements employing a vertically oriented cataphoresis cell.
F D, Sack, D A, Priestley, A C, Leopold
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HISTOLOGICAL STUDIES ON THE COLEOPTILE. I. TISSUE AND CELL TYPES IN THE COLEOPTILE TIP
American Journal of Botany, 1965The uppermost 1‐4 mm of 25‐mm coleoptiles of oats and wheat have been studied at the optical microscope level, using newer histological methods and sections 1‐4 μ thick. The outer epidermal wall, which shows very fine wrinkling, is continuous with the thinner wall of the inner epidermis through the pore.
Terence P. O'Brien, Kenneth V. Thimann
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Stimulation of rice coleoptile growth by ethylene
Planta, 1970The growth rate of rice coleoptiles is increased by low concentrations of ethylene, especially in oxygen concentrations lower than air; carbon dioxide enhanced this response. C2H4 is produced by rice seedlings, and this production is also enhanced by carbon dioxide.
H S, Ku +3 more
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Accelerated endogenous growth in Avena coleoptile segments
Planta, 1974An unexpected acceleration in elongation of Avena coleoptile segments has been observed with a position sensor transducer 2 to 2.5 h after excision when the segments are immersed in 5 mM succinate buffer (pH 6). The cause of the accelerated growth is unknown.
M G, Cline, M, Edgerton, M M, Rehm
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