Results 161 to 170 of about 26,188 (195)
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Development of the pollen grain wall in Canna
Nordic Journal of Botany, 1986During the tetrad period spinules form on the Canna L. plasma membrane at intervals of 1–2 μm on a microspore surface of ca. 100 μm 2 . The isolated spinules represent all that there is of a primexine‐like nature.
John R. Rowley, John J. Skvarla
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Proteolytic activity in the maize pollen wall
Physiologia Plantarum, 1996A new protease from maize (Zea mays L.) pollen is described. It was purified using gel filtration, ion exchange and high performance liquid chromatography. SDS‐PAGE and HPLC showed that the enzyme has a dimeric structure of M, ca 60,000. Inhibitor investigations indicated an aspartic acid residue in its active site.
Marek Radlowski +4 more
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Mechanisms of pollen wall development in Lysimachia vulgaris
ProtoplasmaExine, this complex sporopollenin-containing and highly variable among taxa envelope of the male gametophyte, consists of two layers, ectexine and endexine. We traced in detail the pollen wall development in Lysimachia vulgaris (Primulaceae), with emphasis on driving forces and critical ontogenetic time.
Nina I. Gabarayeva +2 more
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Pollen wall proteins: Pollen-Stigma interactions in ragweed and Cosmos (compositae)
Journal of Cell Science, 1973ABSTRACT The release of wall-held materials from the pollen of ragweed (Ambrosia tenuifolia) and Cosmos bipimuxtus on to the stigma surface has been followed. When fresh stigmas were viewed by scanning electron microscopy, a fluid material was observed coating pollen grains, pollen tubes and adjacent stigmatic papillae.
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Molecular Cell Biology of Pollen Walls
2013The pollen wall comprises the outer exine and the inner intine layers. It plays important roles in protecting pollen from various environmental stresses including microbial attack and in cell-cell recognition during pollination. The exine is further divided into a sexine and a nexine layer. The material for the exine is provided directly by the tapetal
Yue Lou, Jun Zhu, Zhongnan Yang
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Pollen Wall Development of Austrobaileya maculata
Botanical Gazette, 1984Pollen wall development of Austrobaileya maculata was investigated from the initiation of pollen mother cells to anthesis. Pollen wall development can be divided into three phases: premeiotic, tetrad, and free spore. The ektexine develops within the tetrad phase and follows the pattern for other tectate-columellate angiosperm pollen thus far ...
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In vitro and In vivo digestion comparison of bee pollen with or without wall‐disruption
Journal of the Science of Food and Agriculture, 2021Jiangtao Qiao, Hongcheng Zhang
exaly
OsLTP47 may function in a lipid transfer relay essential for pollen wall development in rice
Journal of Genetics and Genomics, 2022Libin Chen, Chonghui Ji, Degui Zhou
exaly