谷子(Sotaria italioa Beauv)的花药发育和小孢子发生

谷子药壁的发育属单子叶型。在花粉成熟时,药壁仅剩下药室内壁和表皮,中层和绒毡层分别在小孢子母细胞和花粉的发育过程中退化消失。绒毡层为分泌类型。小孢子母细胞减数分裂前期Ⅰ存在染色质穿壁现象。由小孢子母细胞减数分裂形成的四分体有两侧对称、交互对称、直列式和T形。胞质分裂为连续型。在花序顶端自旗叶露出后的1—2天之内,是采集减数分裂材料的最佳时期。

The Development of Anther and Microsporogenesis in Setaria italica Beauv.

The development of anther wall is of monocotyledonous type. At the matureof pollen, anther wall contains only endothecium and epidermis, and middle lay-er and tapetum have disappeared respectively in the course of the development ofmicrospore mother cells and pollen grains. The tapetum is a secretory tapetum.In the prophase of the meiosis of microspere mother cells exists cytomixis. Thetetrad is isolateral, decussate, linear and T-shaped. 1--2days in which the topof inflorescence is exposing from flag leaf are the best time for collecting thematerial of meiosis.