荞麦水合花粉和花粉管中的被膜小泡

荞麦水合花粉粒和生长中的花粉管中内质网潴泡形成的囊袋状结构较少见，但内质网囊袋中含有丰富的被膜小泡，直径约为100－150nm。刚刚形成的花粉管中，被膜小泡主要来自于花粉粒营养细胞的细胞质。生长中的花粉管的被膜小泡可由高尔基体分泌形成。另外还观察到内质网的碎裂也是荞麦花粉管中产生被膜小泡的一种机制。花粉管的被膜小泡中含有花粉管壁的前体物质，与花粉管的壁融合参与花粉管的生长。被膜小泡可能含有与脂体和造粉质体水解有关的酶，参与此类物质的降解。荞麦花柱和柱头细胞内含物的解体物质参与花粉管的生长。

The Coated Vesicles in Hydrating Pollen Grain and Pollen Tube of Buckwheat

There are few rough endoplasmic reticulum (RER) pocket like units which have large amount of coated vesicles (100-150?nm) in the hydrating pollen grain and pollen tube of buckwheat( Fagopyrum esculentum Monch.).In the newly formed pollen tube,the coated vesicles mainly come from the pollen grain.The coated vesicles in the growing pollen tube are secreted from golgi body.And the breakage of RER is another resource of coated vesicles in the growing pollen tube.In the pollen tube of buckwheat,the function of coated vesicles which contain the precursor of pollen tube wall is to form pollen tube besides decomposing lipid bodies and amyloplast.The decomposing substance of stigma and style cells play an important role in the growth of pollen tube of buckwheat.