Deposition of starch in plastids initiates at this stage.Part of plastids vacuolated with invagination of plastid membrane, which possess the same function as that of vacuole in the cell.

 
  • 质体开始积累淀粉,部分质体呈空泡状,并出现质体膜内陷,这与液泡具相似的功能。
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