Results 151 to 160 of about 26,188 (195)
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CYTOCHEMICAL REACTIVITY OF POLLEN WALLS
Journal of Histochemistry & Cytochemistry, 1973Cytochemical staining reactions in pollen grain walls of three species of Compositae, Ambrosia trifida, Artemisia pycnocephala and Gerbera jamesonii, were examined. The intine gives positive reactions for protein and for insoluble polysaccharides including pectic acid, callose and hemicellulose.
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1992
Publisher Summary Pollen grain is the carrier of the male gametes or their progenitor cell. The pollen grain has a heterogeneously developed wall, and pollen grains are distinguished by a multitude of sculptures and structures. The pollen wall, the sporoderm, is the most complex wall system in the life cycle of higher plants.
R. Wiermann, S. Gubatz
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Publisher Summary Pollen grain is the carrier of the male gametes or their progenitor cell. The pollen grain has a heterogeneously developed wall, and pollen grains are distinguished by a multitude of sculptures and structures. The pollen wall, the sporoderm, is the most complex wall system in the life cycle of higher plants.
R. Wiermann, S. Gubatz
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A signaling peptide locks pollen tube walls
Science, 2023A protein-peptide complex generates and stabilizes a cell-wall carbohydrate ...
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Pollen-wall proteins: localization and enzymic activity
Journal of Cell Science, 1970ABSTRACT Cytochemical methods have been used to examine the distribution of acid phosphatase, ribonuclease, esterase, amylase and protease activity and protein in the walls of pollen grains and spores. Enzyme activity was detected in the walls of 50 angiosperm pollens, in pine, and in the spore wall of a species of Equisetum.
R B, Knox, J, Heslop-Harrison
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Hemicellulose of the pollen tube wall of Camellia japonica
Plant and Cell Physiology, 1980Successive fractionation of the pollen tube wall polysaccharides of Camellia japonica was carried out to analyze the sugar composition of each fraction. The hemicellulose fraction extracted with dimethylsulfoxide accounted for about 47% of the pollen tube wall. A purified preparation of this fraction was comprised essentially of glucose. A low specific
N, Nakamura, K, Yoshida, H, Suzuki
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Sugar composition of pollen grain and pollen tube cell walls
Phytochemistry, 1981Abstract The sugar composition of pollen grain and pollen tube cell walls was studied for Camellia japonica, C. sasanqua, C. sinensis, Tulipa gesneriana and Lilium longiflorum . In all species, the main components of pollen grain walls were arabinose, galactose, glucose and uronic acid.
Norio Nakamura, Hiroshi Suzuki
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Pollen wall stratification and pollination
Plant Systematics and Evolution, 2000Qualities of the stratified pollen walls were evaluated for their possible role in pollination (pollination modes, and pollen tube formation). The importance of studying pollen grains in their respective natural state is noted. Examples of pollen morphological features specific to pollination vectors are rare and difficult to demonstrate. However, some
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Uncommon pollen walls: reasons and consequences).
Verhandlungen der Zoologisch-Botanischen Gesellschaft in Osterreich, 2011The mature pollen wall of gymnosperms and angiosperms consists in principle of two fundamentally different layers, the complex, thick sporopolleninous exine and the homogeneous, thin, single-layered pectocellulosic intine. In angiosperms, the typical exine is usually formed by a tectum, columellae, a foot layer, and an endexine.
Pacini, Ettore, Hesse, Michael
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Zymolyase removes callose from germinating pollen and pollen tube walls
Cell Biology International Reports, 1985The impermeable callosic wall that surrounds germinating pollen grains and pollen tubes is removed by brief treatment with Zymolyase, an enzyme preparation that hydrolyzes linear glucose polymers with beta-1,3 linkages. Zymolyase treatment does not interfere with pollen tube growth or cylosis in the vegetative cell.
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FINE STRUCTURE OF PARKINSONIA ACULEATA POLLEN. I. THE POLLEN WALL
American Journal of Botany, 1961L arson , D onald A., and C. W illard L ewis , J r . (U. Texas, Austin.) Fine structure of Parki
Donald A. Larson, C. Willard Lewis
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