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Rhythmic changes in transcriptional activity during the development of potato tubers

✍ Scribed by Manfred Wechselberger; Bernard Wielgat; Günter Kahl

Publisher
Springer-Verlag
Year
1979
Tongue
English
Weight
484 KB
Volume
147
Category
Article
ISSN
0032-0935

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✦ Synopsis

Chromatin-bound, DNA-dependent RNA polymerase (EC 2.7.7.6) activity and chromatin template availability, as measured with saturating amounts of E. coli RNA polymerase, changes rhythmically during the formation, dormancy, and sprouting of potato tubers. Active growth processes coincide with the highest RNA polymerase activity as well as the greatest template accessibility, during tuberization and sprouting. Consequently, chromatin-associated RNA and protein content is highest in young developing tubers and in old tubers at the onset of sprouting. Ribosomal RNA content, in turn, is maximal in small tubers, remains constant during dormancy, and decreases when sprouting begins, probably due to the translocation of rRNA into the sprouts. The nucleolus changes its shape and size concomitantly with the process of tuberization.

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