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Acta Prataculturae Sinica ›› 2022, Vol. 31 ›› Issue (1): 181-194.DOI: 10.11686/cyxb2021237

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Identification and expression characteristics of a cation/H+ exchanger gene family in Medicago truncatula

Tong WU(), Yun-miao LIU, Jun JIN, Wei-feng DONG, Xiao-xi CAI, Ming-zhe SUN, Bo-wei JIA(), Xiao-li SUN()   

  1. Crop Stress Molecular Biology Lab,Heilongjiang Bayi Agricultural University,Daqing 163319,China
  • Received:2021-06-17 Revised:2021-07-19 Online:2021-12-01 Published:2021-12-01
  • Contact: Bo-wei JIA,Xiao-li SUN

Abstract:

The CPA (cation proton antiporter) superfamily regulates intracellular ion and pH homeostasis by transporting proton and monovalent metal ions. Cation/H+ exchangers (CHX) belong to cation proton antiporter 2 (CPA2) superfamily. CPA2 members contain an Na+/H+ exchanger domain at the N terminus, which plays an important role in maintaining ion balance and flower organ development. In this study, CHX family genes from Medicago truncatula were systematically analyzed using bioinformatics, and a total of 47 non-redundant MtCHXs were identified by genome-wide screening. Chromosome location analysis showed that MtCHXs were distributed on 8 different chromosomes. Homology analysis indicated that alfalfa was closely related to Arabidopsis, but far removed from rice (Oryza sativa). According to their evolutionary relationship, the 47 MtCHXs were further divided into 5 groups, andgene structure and motif of MtCHX genes within each group were conserved. In addition, analysis of the cis-acting element revealed that the MtCHXs gene promoter contained numbers of light-responsive elements, hormone-responsive elements, drought, low temperature and wound responsive elements. Further analysis of expression characteristics indicated that MtCHXs were highly expressed in reproductive organs and responded to abiotic stresses such as drought and low temperature.

Key words: Medicago truncatula, cation proton antiporter, CHX, bioinformatics