Abstract
Cyanobacreria generally possesses many genes that encode phytochrome-like protein. We performed following experiment to examine the regulatory role of phytochrome-like protein on light-responsive gene expressions. We incubated mutant cells in which genes sll0821, sll1124, sll1473, slr0473, slr1212, slr1393, slr1805, slr1969 encoding phytochrome-like protein have been destroyed under the darkness for 12-hour and then illuminated by white light for one hour. We selected light-responsive genes whose expression level was increased more than twice or reduced less than half by transition from dark to light, but the rate of induction or reduction was decreased less than half in the mutants by DNA microarray analysis. In consequence, It was clarified that the induction of the expression of cpcG2 by illumination was almost eliminated in sll1473 mutant. In addition, characteristic effects were observed in other mutants. We will also report our ongoing study about the regulation light-responsive cpcG2 expression.
