1994 年 58 巻 6 号 p. 1077-1079
Cells at the apical part of developing stolons of the potato (Solanum tuberosum L. cv. Norin 1) were analyzed for the occurrence of putative precursors to amyloplasts, designated "amyloplast initial." Ultrastructural studies showed that the cells contained the expected novel organelle. It was about 1μm in diameter, devoid of thylakoid membranes, and was stained to a similar extent as the stroma of amyloplasts by uranyl acetate and lead citrate. Formation of thylakoid membranes and starch granules takes place at an early stage of development of these initials when they are just a few μm in diameter. At this stage, proliferation of the initials takes places by division at random sites.
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