Biotechnology Bulletin ›› 2022, Vol. 38 ›› Issue (7): 160-170.doi: 10.13560/j.cnki.biotech.bull.1985.2021-1285

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Structural and Functional Characterization of AOX Gene Family

WANG Hui1(), MA Yi-wen2, QIAO Zheng-hao3, CHANG Yan-cai3, ZHU Kun3, DING Hai-ping3, NIE Yong-xin3(), PAN Guang-tang1()   

  1. 1. Maize Research Institute of Sichuan Agricultural University,Chengdu 611130
    2. Tonghua Academy Agricultural Sciences,Tonghua 135007
    3. State Key Laboratory of Crop Biology,Shandong Agricultural University,Tai'an 271018
  • Received:2021-10-09 Online:2022-07-26 Published:2022-08-09
  • Contact: NIE Yong-xin,PAN Guang-tang E-mail:wanghui18310256976@163.com;pangt@sicau.edu.cn;nyx03@163.com

Abstract:

AOX(alternative oxidase,AOX)is a terminal oxidase in the respiratory pathway of plants. Through the identification and analysis of AOX genes in 8 species of Zea mays,Oryza sativa,Arabidopsis thaliana,Brachypodium distachyon,Solanum lycopersicum,Solanum tuberosum,Sorghum bicolor and Glycine max,we aim to further explore the function and regulatory mechanism of AOX gene. A total of 35 genes encoding AOX protein in these 8 species were identified,and these 35 genes were divided into 5 subfamilies by cluster analysis. The phylogenetic analysis and comparison of the chromosome position exon-intron structure and the conserved motif composition of AOX further supported the subfamily division model,and revealed that the AOX gene maintained a strong conserved nature during the evolution process. The prediction of cis-acting elements,miRNA target sites and the GO annotation analysis of AOX protein revealed that AOX gene may play an important role in plant growth and development and stress response. After stress treatment at the seedling stage of maize,the qRT-PCR analysis of 4 AOX genes in maize showed that the 4 AOX genes presented different degrees of inducible expression,suggesting that they were closely related in response to abiotic stress. These results lay a foundation for further understanding the biological function of AOX genes and their regulatory mechanism in response to abiotic stress.

Key words: AOX, gene family identification, expression analysis, abiotic stress