The tetrasporophyte wrapped by callose is of simultaneous type.

四分体呈四面体型，被胼胝质壁所包围。

T: Tapetal; N: Nucleus; TE：Tetrad; TW: Wall of tapetal cell; V: V acuole; D: Dictyosome; C: Callose; M: Mitochondria.

绒层，N：，TE:四分体，TW：绒层壁，V：,D：尔基体，C：胼胝质壁，M：线粒体。

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

营养的质中继续积累胼胝质，花粉成熟对胼胝质在小孢子形成和发育过程中的功能进行了讨论。