Welcome to Chinese Agricultural Science Bulletin,

Chinese Agricultural Science Bulletin ›› 2020, Vol. 36 ›› Issue (35): 1-13.doi: 10.11924/j.issn.1000-6850.casb20191200983

Special Issue: 生物技术 水稻 农业生态

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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 E-mail:952050369@qq.com;djin@mail.hzau.edu.cn

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

CLC Number: