摘要: 脯氨酸在提高植物抗逆性方面起着非常重要的作用。本研究以朝鲜碱茅茎叶组织提取的RNA为模板,根据已报道的P5CS基因同源序列设计引物,通过RT-PCR法扩增出1个P5CS的cDNA序列,全长2 158 bp,是一个完整开放阅读框,编码含716个氨基酸的蛋白,Genebank登陆号为:HQ637435。与其他植物P5CS基因进行同源性比对的结果显示,朝鲜碱茅P5CS基因的核苷酸和氨基酸序列与小麦的同源性最高。并对其信号肽、疏水性、跨膜结构、二级结构和主要功能域做了预测。半定量RT-PCR结果表明,PuP5CS基因在朝鲜碱茅的根部和叶片均有表达,但是根部的表达量较低,叶片中的表达量较高,在4种胁迫处理条件下,表达规律也不尽相同。
关键词:
朝鲜碱茅,
&Delta,
&rsquo,
-吡咯啉-5-羧酸合成酶,
基因克隆
Abstract: Delta 1-pyrroline-5-carboxylate synthetase(P5CS) plays a critical role in improving the stress tolerance of plants. In this study, the full length cDNA sequence of P5CS gene was cloned from Alkaligrass(Puccinellia chinampoensis) leaves using RT-PCR method, the primers were designed according to the homologous P5CS gene sequences of other plant species. Sequence analysis showed that the nucleotide sequence of this gene is 2 158 bp,containing a complete open reading frame and encoding 716 amino acids,Genebank: HQ637435. Nucleotide and amino acid sequence analysis revealed that PuP5CSshares high identity with the orthologs from Triticum aestivum. And its signal peptide,hydrophobicity /hydrophilic, trans-membrane domain,secondary structure and main functional domains were predicted. Semi-quantitative RT-PCR analysis showed that PuP5CSexpressed in different tissues,but the expression in root was lower,and in leaf much higher. Various elevated levels of PuP5CSexpression have been detected when exposed to 4 different stress experimental treatment,and the results was not the same.
Key words:
Puccinellia chinampoensis,
P5CS,
Gene clone
中图分类号:
徐博, 任伟, 徐安凯, 王志锋, 孙启忠. 朝鲜碱茅Δ’-吡咯啉-5-羧酸合成酶(P5CS)基因的克隆及表达分析[J]. 华北农学报, 2011, 26(6): 20-26. doi: 10.7668/hbnxb.2011.06.005.
XU Bo, REN Wei, XU An-kai, WANG Zhi-feng, SUN Qi-zhong. Molecular Cloning and Expression Analysis of Delta 1-pyrroline-5-carboxylate Synthetase(P5CS) Gene in Puccinellia chinampoensis[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2011, 26(6): 20-26. doi: 10.7668/hbnxb.2011.06.005.