Results 171 to 180 of about 24,573 (227)
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Characteristics of pollen diffusates and pollen wall cytochemistry in poplars
Journal of Cell Science, 1980ABSTRACT Pollen diffusates, known to be important in pollen-stigma interactions controlling inter-specific incompatibility between Populus deltoides and Populus alba, have been partly characterized and shown to contain more than 20 protein bands by polyacrylamide gel electro-phoresis, at least 4 of these being glycoproteins.
A E, Ashford, R B, Knox
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A biological nanofoam: The wall of coniferous bisaccate pollen
Science Advances, 2021The outer layer of the pollen grain, the exine, plays a key role in the survival of terrestrial plant life. However, the exine structure in different groups of plants remains enigmatic. Here, modern and fossil coniferous bisaccate pollen were examined to
Ruxandra Cojocaru +5 more
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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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A signaling peptide locks pollen tube walls
Science, 2023A protein-peptide complex generates and stabilizes a cell-wall carbohydrate ...
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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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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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The Basic Pollen Wall Types in Araceae
International Journal of Plant Sciences, 1999An ultrastructural investigation of 60 species, representing 47 genera, of Araceae showed two basic pollen wall types, each with two subtypes. The two main types are distinguished by presence (type 1) or absence (type 2) of an acetolysisâresistant ektexine.
Weber, Martina +2 more
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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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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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In Vitro and In Vivo Digestion Comparison of Bee Pollen with or without Wall-disruption.
The Journal of the Science of Food and Agriculture, 2020BACKGROUND Bee pollen is recommended as a treasure trove of human and animal nutrients due to its extensive nutritional and therapeutic properties. However, the sophisticated pollen wall can largely limit the digestibility and bioavailability of these ...
Wei Wu +5 more
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