The U.S. Forest Products Laboratory, Madison.
Planta. 1966 Dec;69(4):319-37. doi: 10.1007/BF00392283.
At maturity, the enucleate sieve element of Primula obconica is lined with a parietal layer of cytoplasm consisting of plasmalemma, one or more cisterna-like layers of endoplasmic reticulum, numerous mitochondria and plastids, and a membrane which apparently separates these cytoplasmic components from a large central cavity. The central cavity contains numerous longitudinally oriented slime tubules. We believe these tubules normally form strands which run the length of the cell and traverse consecutive cells through the sieve-plate pores. Developmental aspects are discussed.
在成熟过程中，珍珠菜属筛分子的无核部分由一层质膜、一到多个类似内质网囊泡的层、许多线粒体和质体组成的壁层细胞质所围绕，还有一层膜将这些细胞质成分与一个大的中央腔隔开。中央腔含有许多纵向排列的粘液小管。我们认为这些小管通常形成贯穿细胞并通过筛板孔穿过连续细胞的链。本文讨论了发育方面的问题。
