Leaf Downward Curvature and Delayed Flowering Caused by AtLH Overexpression in Arabidopsis thaliana  

作　　者：WUHao YULin TANGXiang-Rong SHENRui-Juan HEYu-Ke 

机构地区：[1]StateKeyLaboratoryofPlantMolecularGenetics,ShanghaiInstituteofPlantPhysiologyandEcology,ShanghaiInstitutesofBiologicalSciences,TheChineseAcademyofSciences,Shanghai200032,China

出　　处：《Acta Botanica Sinica》2004年第9期1106-1113,共8页Acta Botanica Sinica（植物学报：英文版）

摘　　要：AtLHgene of Arabidopsis is a BcpLH(leafy head) homolog of Chinese cabbage, which encodes a double-stranded RNA-binding protein related to the curvature of folding leaf leading to the formation of leafy head. In order to elucidate the regulatory function of AtLH in the development of leaf curvature, we made a construct of 35S::AtLHand transformed it to Arabidopsis. In transgenic plants for sense-AtLH, transcripts of AtLH gene were increased significantly in leaves and flowers, giving rise to the AtLH-overexpressed plants in which the rosette leaves curved downward or outward in a manner of enhanced epinastic growth. Compared with normal plants, bolting and flowering time of the transgenic plants was significantly delayed. Moreover, the apical dominance of transgenic plants was weaker in vegetative shoots since more axillary shoots emerged from axil of rosette leaves, while stronger in flowering shoots because fewer cauline inflorescences were observed on the main inflorescence. In other aspects, these transgenic plants exhibited an increase in root-stimulating response to IAA and decrease in root-inhibitory reaction on ABA. It indicates that overexpression of AtLH causes downward curvature of transgenic plants.

关 键 词：叶 下屈率 成熟 阿布属 基因 开花时间 生物量 

分 类 号：Q943.2[生物学—植物学]