Cloning and Functional Analysis of SIDP301 Gene in Oryza sativa
- 生命科学－已发表论文 
水稻是一种重要的粮食作物,也是单子叶植物研究的模式植物,其抗逆相关基因的克隆与功能分析具有重要的理论和现实意义.水稻SIDP301基因编码的蛋白质含有DUF1644家族保守结构域和锌指结构域.实时荧光定量PCR(qRT-PCR)数据表明SIDP301基因在水稻各个组织中均有表达,其中在根和叶中表达水平较高.SIDP301基因的表达受高盐、高温和茉莉酸诱导.与对照相比,超量表达转基因植株的耐盐性不明显,而抑制表达转基因植株对高盐较敏感.进一步用qRT-PCR检测抗逆相关标记基因,结果表明P5CS、DREB2A、Rab16a和Lea3-1在超量表达转基因植株中的表达量高于野生型植株,而在抑制表达转基因植株中这些基因的表达变化不明显.上述结果说明SIDP301是一个抗逆相关基因,其表达量受抑制时会降低水稻的抗逆性.Rice is an important food crop,and it is also a model plant for the study of monocotyledon.It is of important theoretical and practical significance to clone the resistance genes in rice.SIDP301 gene is cloned from rice,which encodes a protein containing a DUF1644 conservative domain and zinc finger domain.Quantitative RT-PCR( qRT-PCR) data showed that SIDP301 was expressed in all tissues and organs of rice and with higher level in roots and leaves.Its expression was induced by stresses including salt,heat and jasmonate.The salt tolerance of SIDP301-overexpressing transgenic plants had no significant difference compared to the wild-type plants.However,SIDP301-suppressing transgenic plants exhibited hyposensitivity to salt stress compared to the wild-type plants.Through expression profiling analysis using qRT-PCR,all of the examined stress-responsive genes( eg. P5 CS,DREB2A,Rab16 a and Lea3-1) were found to be up-regulated in SIDP301-overexpressing transgenic plants compared to the wild-type plants under salt stress,but the levels of gene expression had no significant difference in the SIDP301-suppressing transgenic plants compared to the wild-type plants. These results indicate that SIDP301 is a stress-related gene,and the suppression of its expression was able to decrease the resistance of rice.