以地被菊(Chrysanthemum morifolium Ramat.)'七月桃花'为材料,利用同源基因克隆法结合RACE技术克隆了光周期调控开花重要基因FLOWERING LOCUS T(FT)的类似基因(基因登陆号GQ925916,命名为CmFT)。该基因开放阅读框有525bp,可编...以地被菊(Chrysanthemum morifolium Ramat.)'七月桃花'为材料,利用同源基因克隆法结合RACE技术克隆了光周期调控开花重要基因FLOWERING LOCUS T(FT)的类似基因(基因登陆号GQ925916,命名为CmFT)。该基因开放阅读框有525bp,可编码174个氨基酸。蛋白比对发现,CmFT所推测的氨基酸序列包含FT类蛋白保守基序和两个关键性氨基酸残基。通过系统遗传进化树分析进一步表明CmFT属于FT亚家族成员。SYBR GREEN法实时荧光定量RT-PCR表达分析结果表明CmFT在花芽的表达量最高,茎的表达量次之,叶片表达量最低。在短日条件下,该基因的表达量呈昼夜节律表达型,在光照期间呈下降趋势,在夜间逐渐上升,光照前4h时达到最高水平。在长日条件下,其相对表达量显著低于短日条件下且趋于零。由此推测,该基因主要与菊花光周期敏感性密切相关,可能在光周期促进开花中发挥一定的作用。展开更多
The receptor for activated C-kinase 1 （RACK1） is a highly conserved scaffold protein with versatile functions, and plays important roles in the regulation of plant growth and development. Transgenic rice plants, in ...The receptor for activated C-kinase 1 （RACK1） is a highly conserved scaffold protein with versatile functions, and plays important roles in the regulation of plant growth and development. Transgenic rice plants, in which the expression of RACK1 gene was inhibited by RNA interference （RNAi）, were studied to elucidate the possible functions of RACK1 in responses to drought stress in rice. Real-time PCR analysis showed that the expression of RACK1 in transgenic rice plants was inhibited by more than 50%. The tolerance to drought stress of the transgenic rice plants was higher as compared with the non-transgenic rice plants. The peroxidation of membrane and the production of malondialdehyde were significantly lower and the superoxide dismutase activity in transgenic rice plants was significantly higher than those in non-trangenic rice plants It is suggested that RACK1 negatively regulated the redox system-related tolerance to drought stress of rice plants.展开更多
基金supported by the National Natural Science Foundation of China (Grant No. 30571120)the National High Technology Research and Development Program of China (Grant No.2008AA10Z120)the Research Fund for the Doctoral Program of Higher Education, China
文摘The receptor for activated C-kinase 1 （RACK1） is a highly conserved scaffold protein with versatile functions, and plays important roles in the regulation of plant growth and development. Transgenic rice plants, in which the expression of RACK1 gene was inhibited by RNA interference （RNAi）, were studied to elucidate the possible functions of RACK1 in responses to drought stress in rice. Real-time PCR analysis showed that the expression of RACK1 in transgenic rice plants was inhibited by more than 50%. The tolerance to drought stress of the transgenic rice plants was higher as compared with the non-transgenic rice plants. The peroxidation of membrane and the production of malondialdehyde were significantly lower and the superoxide dismutase activity in transgenic rice plants was significantly higher than those in non-trangenic rice plants It is suggested that RACK1 negatively regulated the redox system-related tolerance to drought stress of rice plants.
