1. 一个专门英文学习的网站：
https://www.biologiks.co.in/home/sexual-reproduction-in-plants
2. 绒毡层功能
i. Secretion of the enzyme callase to dissolve the callosic wall of the tetrad and set them free.
ii. Secretion of polysaccharides into the locules during the free microspore stage.
iii. Secretion of sporopollenin precursor.
vi. Formation of different structures.
v. Formation of buisch bodies.
vi. Formation of pollenkitt and tryphine.
vii. Formation of pollen wall during post-meiotic period.
- 小麦花药发育的形态学观察
参考：小麦花药和花粉粒的发育
