LEAFY HEAD2,which encodes a putative RNA-binding protein,regulates shoot development of rice  

作　　者：Guo Sheng Xiong Xing Ming Hu Yong Qing Jiao Yan Chun Yu Cheng Cai Chu Jia Yang Li Qian Qian Yong Hong Wang 

机构地区：[1]State Key Laboratory of Plant Genomics and National Center for Plant Gene Research, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing 100101, China [2]State Key Laboratory of Rice Biology, China National Rice Research Institute, Chinese Academy of Agricultural Sciences, Hangzhou 310006 China [3]Graduate University of Chinese Academy of Sciences, Beijing 100049, China

出　　处：《Cell Research》2006年第3期267-276,共10页细胞研究（英文版）

摘　　要：During vegetative development, higher plants continuously form new leaves in regular spatial and temporal patterns. Mutants with abnormal leaf developmental patterns not only provide a great insight into understanding the regulatory mechanism of plant architecture, but also enrich the ways to its modification by which crop yield could be improved. Here, we reported the characterization of the rice leafy-head2 （lhd2） mutant that exhibits shortened plastochron, dwarfism, reduced tiller number, and failure of phase transition from vegetative to reproductive growth. Anatomical and histological study revealed that the rapid emergence of leaves in lhd2 was resulted from the rapid initiation of leaf primordia whereas the reduced tiller number was a consequence of the suppression of the tiller bud outgrowth. The molecular and genetic analysis showed that LHD2 encodes a putative RNA binding protein with 67% similarity to maize TEl. Comparison of genome-scale expression profiles between wild-type and lhd2 plants suggested that LHD2 may regulate rice shoot development through KNOXand hormone-related genes. The similar phenotypes caused by LHD2 mutation and the conserved expression pattern of LHD2 indicated a conserved mechanism in controlling the temporal leaf initiation in grass.

关 键 词：PHYLLOTAXY PLASTOCHRON LHD2 RNA-binding protein stem elongation plant architecture Oryza sativa L 

分 类 号：S511[农业科学—作物学]