PJB-1986-14
SPONTANEOUS MUTAGENESIS IN WILD TYPE AND RADIATION DEFECTIVE MUTANTS OF CYANOBACTERIUM ANACYSTIS NIDULANS
S.A. RASOOL, L.E. KARBISHEVA*
AND V.D.
ZHEVNER*
Abstract
Comparative studies on the spontaneous mutation rate on eryr marker of wil& type
cyanobac¬terium Anacystis nidulans and its
UV sensitive (and UV resistant) mutants were carried out in order to determine the
effect of repair processes affecting
mutations. Some of the UVS and XRS mutations decreased the rate of spontaneous mutations while other similar mutations did
not affect the level of spontaneous mutagenesis compared with the increased
level of UV induced mutations. The process of spontaneous mutagenesis in cyanobacterium A. nidulans is controlled by
complicated genetical systems that are responsible for radiation sensitivity of the
cells. Moreover, the rate of spontaneous and induced mutagenesis was correlated in majority of the strains tested.
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