In most seed plants the pollen grains are single (monads). In some angiosperms the microspores and the pollen grains that develop from the microspores are united in twos (dyads; for example, in Scheuchzeria) or fours (tetrads; for example, in many Ericaceae and some Orchidaceae) or in ei...
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...
2. Determine the Relationship Between Meiotic Divisions and Pollen Grains: - From one meiotic division, four microspores (which develop into pollen grains) are produced. - Therefore, to find out how many meiotic divisions are needed to produce a certain number of pollen grains, we can use the...
(B) Pollen grains from wild-type plant (a), heterozygous T-DNA insertion mutant plant (b), complementa- tion transgenic plant (c), and RNAi transgenic plant (d). Arrows showed abnormal pollen grains. (C) The expression levels of AtMGT9 transcripts in wild-type plant (wt), heterozygous...
In pollen grains from flowers in bloom, MBFs changed to lysosomal structures with acid phosphatases (lytic vacuole). They gradually increased in number and volume, and decomposed the cytoplasm. The autolysis of pollen grains is the first finding in this study, which may contribute to the loss ...
Pollen grains from homozy- gous plants mutated in PECTIN METHYLESTERASE48 gene developed multiple germinating sites due to the presence of more abundant highly methylesterified pectin in the intine wall10. A T-DNA insertion line mutated in the Callose Synthase 9 gene produced pollen grains able ...
Levels of GABA are elevated 4-fold in mutant pollen grains (Table 2) and are likely to increase in tubes after exposure to exogenous GABA. The complexity of the in vivo environment challenges direct comparisons with in vitro data; nonetheless, it is likely that the concentrations of GABA in ...
Pollen grains are, in essence, plant sperm. Or perhaps more technically, sperm sedans. Inside, they contain the male gametes, which is the portion of DNA needed for plant reproduction. There are many unique adaptations to help the pollen get where it needs to go -- namely, its own species...
In a rich medium, microspores and young pollen grains develop into mature pollen that is fertile. When pollen is treated by a stress treatment such as a hunger treatment in a sucrose - and/or nitrogen - free medium, embryogenic pollen is formed that, after transfer to a rich medium, ...
in vitro pollen germination Pollen grains from open male flowers were lightly swept into the pollen germination medium [15% (w/v) sucrose, 0.01% (w/v) boric acid, 1 mM Ca(NO3)2, and 0.5% (w/v) agar, pH 6.5] using a soft brush54. After being cultured in light and humid at 28...