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Role of cyto kinins in the development and metabolism of barley hordeum vulgare cultivar damazy leaves 5. effect of light and kinetin on the transcriptional activity of chromatin in etiolated leaves



Role of cyto kinins in the development and metabolism of barley hordeum vulgare cultivar damazy leaves 5. effect of light and kinetin on the transcriptional activity of chromatin in etiolated leaves



Biochemie und Physiologie der Pflanzen (BPP) 176(7): 614-624



During the first 6 h after illumination of etiolated barley leaves the transcriptional activity of chromatin rapidly increased. The intensity of this light-induced reaction was greatly influenced by leaf age. Kinetin treatment affected chromatin activity, but the response differed also with leaf age. In younger leaves (7 days old) kinetin treatment diminished the effect of light, while in older leaves (9-10 days old) kinetin additionally stimulated the activity of chromatin. Since the observed responses to light and kinetin were primarily due to the .alpha.-amanitin-resistant activity, then they were apparently connected with the transcription controlled by RNA polymerase I responsible for the rRNA synthesis. These findings are discussed in relation to the greening process of etiolated leaves and involvement of cytokinins in this process.

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