Abstract
In nucleoli of ageing tuber disks of Solanum tuberosum L. a rapid increase of the Pars granulosa begins shortly after slicing. At the same time vacuoles of different sizes can be observed. In some nucleoli however only one central vacuole is formed, which increases continuously. Maximal size of this vacuole is reached 48 hours after wounding. At this time the remaining material of the nucleolus is arranged in a small ring around this structure. The size of these giant vacuoles, which contain RNA, is raduced in the subsequent period of woundhealing. The simultaneous existence of vacuoles with different size and the formation of giant vacuoles without application of hormones is discussed in connection with the process of wound healing.
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