callose

The tetrasporophyte wrapped by callose is of simultaneous type.

四分体呈四面体型，被胝质壁所包围。

These results indicate that callose metabolism is active and very important not only in microsporogenesis but also in microgametogenesis in rice.

营养细胞细胞质中继续积累胝质，花粉熟对胝质在小孢子形和发育过程中功能进行了讨论。