Tapetum begins to degenerate at the early stage of free microspore, producing lots of ubisch bodies, and it becomes completely degenerated at anther dehiscence.

 
  • 小孢子发育早期绒毡层开始降解并分泌形成大量乌氏体,花药开裂时绒毡层完全消失,剩下少量乌氏体。
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