Within the rice anther, meiosis of the pollen mother cell produces microspores, which further develop intopollen grains.───水稻的小孢子母细胞在花粉囊中进行减数分裂产生小孢子,小孢子进一步发育成花粉粒。 When the bee lands on a flower on another tree , it brushes against the pistil of the flo...
Pollen grains are covered by the complex extracellular structure, called exine, which in most species is deposited on the pollen surface non-uniformly. Certain surface areas receive fewer exine deposits and develop into regions whose structure and morphology differ significantly from the rest of pollen...
Development of the pollen grain is completed when the pollen tube reaches the embryo sac, into which both spermatozoids participating in double fertilization enter. In most seed plants the pollen grains are single (monads). In some angiosperms the microspores and the pollen grains that develop ...
Above all, half of the pollen grains in F1 hybrids were aborted because of failure during the first mitosis, little starch accumulation and defects in pollen wall structure. To investigate the developmental defects of embryo sacs in the F1 hybrids, confocal laser scanning microscopy was used to ...
Each pollen grain is a double-walled structure (except in some cases) that contains different metabolites like proteins, carbohydrates, hormones, organic acids, pigments, minerals, etc. The proteins present inside pollen grains can activate strong immunological responses in the sensitized peoples known ...
Some observations are also reported from pollen development and structure in the South American species Laurelia sempervirens, mature pollen of which can be distinguished from that of L. novae-zelandiae. The aperture begins to develop while pollen of L. novaezelandiae is still in tetrads, and ...
a one-way special train for special passengers Xiongpo Peng, Meng-Xiang Sun ⇑ College of Life Science, Wuhan University, Wuhan 430072, China Double fertilization is a specific characteristic of angiosperms, in which two sperm cells fuse with the egg and central cell respec- tively [1]. Di...
Considering the higher expression of CsALC in male gametophytes (Fig. 1e), we first investigated the pollen devel- opment and viability by Alexander staining and in vitro germination assays. As shown in Supplementary Fig. 2d, Csalc pollen grains were morphologically normal and able to germinate...
We develop a numerical model in which pollinators carry pollen whose stickiness determines the proportions of pollen deposited on a stigma during a visit and pollen lost from a pollinator body during a flight. Using this model, we explore the evolutionarily stable level of pollen stickiness and ...
10.1038/ncomms4855 OPEN The tapetal AHL family protein TEK determines nexine formation in the pollen wall Yue Lou1,*, Xiao-Feng Xu1,*, Jun Zhu1,*, Jing-Nan Gu1, Stephen Blackmore2 & Zhong-Nan Yang1 The pollen wall, an essential structure for pollen function, consists of two layers,...