摘要
植物开花时间是植物适应不同自然环境的重要生物学特性。近年来模式双子叶长日植物拟南芥中的研究结果表明拟南芥的开花时间受到光周期途径、春化途径、自主途径和赤霉素途径的调节,成花素FT(FLOWERING LOCUS T)是这些调控途径最重要的整合因子之一。水稻是典型的单子叶模式短日植物,水稻中Hd3a(HEADING DATE 3a)是拟南芥FT的同源基因,它的表达产物即是水稻的成花素,可以从叶片移动到顶端分生组织,促进开花。虽然FT和Hd3a在拟南芥和水稻中的功能和序列高度保守,但通过对水稻中其它开花控制基因的研究表明,水稻Hd3a的上游调控因子和调控机制和拟南芥存在很大差异。本文对目前关于水稻成花素Hd3a及其表达调控的研究进展进行综述,为进一步研究Hd3a基因的作用机制提供参考。
Flowering time is a key trait essential for environmental adaptation of plants. Studies in Arabidopsis have revealed that flowering time is controlled by an intricate regulatory network composing of four signaling pathways, namely the photoperiod pathway, the vernalization pathway, the autonomous pathway and the GA pathway. Florigen FT （FLOWERING LOCUS T） is one of the most important common components integrating the effects of these pathways. Hd3a is the rice ortholog of Arabidopsis FF. The Hd3a （HEADING DATE 3a） protein is the candidate of florigen in rice, moving up from light induced leaf to the shoot apex, and eventually promoting flowering. Although the function of FT and Hd3a are conserved, the upstream regulatory factors and associated mechanisms on Hd3a expression are different from that in Arabidopsis. This article reviews the recent progress on rice florigen Hd3a and its regulatory mechanism, intending to provide valuable information for further studies.
出处
《上海交通大学学报（农业科学版）》
2010年第3期296-304,共9页
Journal of Shanghai Jiaotong University(Agricultural Science)
基金
国家973计划项目(2006CB101700)
关键词
光周期
开花时间
成花素
水稻
短日植物
photoperiod
flowering time
florigen
Oryza sativa L.
short-day plant
