Abstract
Red- and far-red-sensing photoreceptors; phytochromes are encoded by small gene families in higher plants. The phytochrome gene family consists of three members known as phyA, phyB and phyC in case of rice. Each member of phytochromes has distinct as well as cooperative roles in monitoring and responding to the environmental light signals. We made each promoter-GUS transgenic rice plants and found the different patterns of GUS expression among these promoters in mature leaf as we reported in the 49st annual meeting. In this study, we analyzed GUS expression patterns in seedlings and developing leaves, and observed effects of light circumstance and phytochrome mutations on these patterns. In order to discuss biological meanings of the expression patterns, we tested complementarity of own or swapped promoter-phytochrome transgenes and each phytochrome mutations. Photomorphogenesis of T1 seedlings indicated that phyA promoter could regulate enough for phyB function but phyB promoter could not for phyA. Now, we are monitoring the flowering time of these transgenic plants and going to report this result at this meeting.
