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中国农学通报 ›› 2020, Vol. 36 ›› Issue (35): 1-13.doi: 10.11924/j.issn.1000-6850.casb20191200983

所属专题: 生物技术 水稻 农业生态

• 生物科学 •    下一篇

不同水稻种质中渗透胁迫抗性基因DREB2A的遗传多样性分析

谭景发(), 贺文闯, 董西龙, 党腾飞, 谢怿, 席锟, 孙勇胜, 胡亚林, 靳德明()   

  1. 华中农业大学植物科学技术学院,农业部长江中游作物生理生态与耕作重点实验室,武汉 430070
  • 收稿日期:2019-12-22 修回日期:2020-02-06 出版日期:2020-12-15 发布日期:2020-12-18
  • 通讯作者: 靳德明
  • 作者简介:谭景发,男,1996年出生,黑龙江齐齐哈尔人,硕士研究生,研究方向:水稻种质资源。通信地址:430070 湖北武汉洪山区狮子山街1号 华中农业大学,E-mail: 952050369@qq.com
  • 基金资助:
    国家重点研发计划-粮食丰产增效科技创新专项“湖北单双季稻混作区周年机械化丰产增效技术集成与示范”(2018YFD0301306)

DREB2A Gene Resistant to Osmotic Stress in Rice Germplasms: Genetic Diversity Analysis

Tan Jingfa(), He Wenchuang, Dong Xilong, Dang Tengfei, Xie Yi, Xi Kun, Sun Yongsheng, Hu Yalin, Jin Deming()   

  1. MOA Key Laboratory of Crop Physiology, Ecology and Cultivation (the Middle Reaches of Yangtze River), College of Plant Science and Technology, Huazhong Agricultural University, Wuhan 430070
  • Received:2019-12-22 Revised:2020-02-06 Online:2020-12-15 Published:2020-12-18
  • Contact: Jin Deming

摘要:

本研究旨在分析转录因子DREB2A基因在不同水稻种质中的遗传多样性,以期为水稻耐渗透胁迫遗传改良提供分子工具。利用单倍型分析、系统进化树、遗传距离和密码子偏好性分析,对85份不同类型水稻种质中DREB2A基因的功能性核苷酸序列变异及遗传多样性进行了研究。共鉴定出55个核苷酸变异位点,其中12个位于编码区,43个位于非编码区;鉴定出12个DREB2A等位基因型,其中来自非洲栽培稻(Oryza glaberrima)的3个等位基因型表现大片段变异;根据DREB2A基因的序列变异鉴定出39个单倍型,其中33个为新单倍型;将所有单倍型分为三组(Group I、II和III),其中非洲栽培稻(Oryza glaberrima)中的10个单倍型单独分为一组(Group III);系统进化树、遗传距离和密码子偏好性分析均表明Group III与其他两组具有较大差异。对85份不同类型水稻种质中DREB2A基因的序列分析表明,非洲栽培稻(Oryza glaberrima)中的DREB2A等位基因在序列变异、系统进化关系和密码子偏好性方面均明显不同于其他种质材料中的等位基因。

关键词: 水稻, 渗透胁迫, 转录因子, DREB2A, 遗传多样性, 密码子偏好性

Abstract:

The purpose is to analyze the genetic diversity of DREB2A gene in different rice germplasms and to provide molecular tools for genetic improvement of osmotic stress-resistance in rice. Haplotype analysis, phylogenetic tree, genetic distance and codon preference analysis were used to study the functional nucleotide sequence variation and genetic diversity of DREB2A gene in 85 rice germplasms of different types. A total of 55 nucleotide mutation sites were identified, 12 of which were located in the coding region and 43 were located in the non-coding region. Twelve DREB2A alleles were identified, including 3 alleles of African cultivated rice (Oryza glaberrima) with large block variation; and 39 haplotypes were identified according to sequence variations of the DREB2A, of which 33 were new haplotypes; all haplotypes were divided into three groups (Group I, II and III), and Group III was made of 10 haplotypes from African rice; Group III showed greater differences with other two groups according to phylogenetic tree, genetic distance and codon usage preference analysis. Sequence analysis of DREB2A genes in 85 rice germplasms of different types showed that DREB2A alleles in African rice were apparently different to the alleles from other types of germplasms in sequence variation, phylogenetic relationship and codon preference.

Key words: rice, osmotic stress, transcription factor, DREB2A, genetic diversity, codon preference

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