Abstract
Photoperiods control several morphogenic responses such like flowering throughout plant life cycle. Recently, rice Hd3a protein was shown to be an important component of the mobile florigen signal. To study the function and localization of Hd3a protein in rice, we expressed the Hd3a-GFP gene by fusing it with phloem-specific Hd3apromoter. Transgenic rice plants flowered (headed) significantly earlier than wild-type plants, suggesting that expression of Hd3a-GFPcauses early flowering. To examine tissue localization of the Hd3a protein in Hd3a-GFP transgenic plants, we analyzed GFP fluorescence in the SAM by confocal laser scanning microscopy. The GFP signal was detected in the SAM. There are some mechanisms that regulate the distribution of Hd3a protein in the SAM. But there mechanisms are unclear. So, we study that where Hd3a protein is localized in the SAM and Hd3a protein regulated in the SAM.
