microsporangium

1. The studies on the developmental anatomy of the microsporangium and male gamete in Pyrus bretschneideri Rehd;
   用石蜡切片等技术对京白梨和鸭梨雄配子体发育以及花粉败育进行了解剖学观察。
2. The primary sporogenous cells functioned directly as microspore mother cells and were arranged in a single row in a microsporangium.
   初生造孢细胞直接行小孢子母细胞的功能，在小孢子囊中成单列。
3. The chromatin of tapetal cell has a period of becoming condensed and then spreading accompanying the meiosis of the microspore mother cells, which will affect the entering of nutrient into the inner part of microsporangium.
   绒毡层细胞的染色质伴随着小孢子母细胞减数分裂有一个浓缩和伸展的时期，这个时期影响营养物质向小孢子囊内部转运。
4. It was found that the callose component initially occurred at late sporogenous cells stage in the cells located in center of microsporangium, and late extended towards the cells lying at its two ends.
   结果发现，黑麦花药中胼胝质的合成最早出现在造孢细胞晚期，并首先在小孢子囊中央的造孢细胞中沉积，随后向小孢子囊两端的细胞扩展。
5. It is suggested that the abnormality of callose wall and short of spro pollenin in the male sterile plant during the genesis and development of the microspore are the main reasons for abortion of microsporangium.
   不育株小孢子发生和发育过程中胼胝质的异常和小孢子缺乏孢粉素是引起小孢子囊败育的原因之一。

noun

1. a plant structure that produces microspores