Localization of Reactivation after UV-Inhibition of Root Growth.

Autor:	Burström, H. G., Gabrielsson, B. E. S.
Předmět:	ROOT growth PLANT growth PLANT physiology CELL division CELL proliferation ULTRAVIOLET radiation RADIATION PLANT cells & tissues PLANT anatomy
Zdroj:	Physiologia Plantarum; 1964, Vol. 17 Issue 4, p964-974, 11p
Abstrakt:	UV-inhibition and reactivation by white light of longitudinal growth have been studied on roots of lasione montana. Determinations have been made by means of photographic recording of the cell division activity and the elongation of segments of the intact root measured on the epidermal cells. UV-irradiation for 15 minutes inhibited for 22 hours in darkness the cell divisions and the cell elongation practically completely. Immediate and continuous illumination by white light following the UV-treatment reactivated cell divisions to 3/4 and the elongation of newly formed cells probably entirely. The initial zone of elongation was the part of the root most sensitive to UV; the second phase of the elongation was inhibited irreversibly under the given conditions, the first phase was partly reactivated. From the meristem through the zone of elongation there is a continuous gradient of decreasing reactivation with increasing vacuolation of the cells. [ABSTRACT FROM AUTHOR]
Databáze:	Complementary Index
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