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Acta Prataculturae Sinica ›› 2024, Vol. 33 ›› Issue (1): 102-116.DOI: 10.11686/cyxb2023100

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Genome-wide identification and expression analysis of the SOD gene family in Alternanthera philoxeroides

Shuo HAN1,2(), Xiao-wen HAN1,2, Yi-feng HU4, Zhong-yi CHEN1,3, Yong-xing ZHU1,3, Jun-liang YIN1,2()   

  1. 1.Engineering Research Center of Wetland Ecology and Agricultural Use,Ministry of Education,Yangtze University,Jingzhou 434025,China
    2.College of Agriculture,Yangtze University,Jingzhou 434025,China
    3.College of Horticulture and Gardening,Yangtze University,Jingzhou 434025,China
    4.College of Life Science,South-Central University for Nationalities,Wuhan 430074,China
  • Received:2023-04-03 Revised:2023-06-14 Online:2024-01-20 Published:2023-11-23
  • Contact: Jun-liang YIN

Abstract:

Superoxide dismutase (SOD) is a conserved antioxidant enzyme, which plays an important role in plant growth and development and stress response. Currently, there is a lack of systematic understanding of the SOD gene family members of Alternanthera philoxeroides (Ap). This study systematically identified and analyzed the SOD gene family in A. philoxeroides using bioinformatics methods. The physicochemical properties, conserved motifs, gene structure, phylogenetic relationship, miRNA targeting relationship and expression pattern were analyzed. The results showed that a total of 43 ApSOD proteins were identified, of which 22 belonged to the Cu/ZnSOD subfamily and 21 belonged to the Fe/MnSOD subfamily. Protein characteristic analysis showed that 36 ApSOD proteins were hydrophilic proteins, and 37 ApSOD proteins were stable proteins; subcellular localization prediction showed that most Cu/ZnSOD proteins were localized in chloroplasts or the cytoplasm, and most Fe/MnSOD proteins were localized in mitochondria. Conserved domain analysis showed that members of the same subfamily had similar conserved motifs and gene structures. Prediction of miRNA targeting relationships showed that 17 miRNAs target to 14 ApSODs through cleavage or translation inhibition. Expression pattern analysis showed that the expression level of ApSODs were relatively stable in different environmental conditions and tissues. The expression patterns of 6 ApSODs were analyzed by RT-qPCR under herbicide treatment. Six ApSODs were significantly up-regulated within 7 d under oxadiazon and fluroxypyr stresses; under fluoroglycofen stress, the expression of four ApSODs initially increased and then decreased, and then increased again with extended duration of herbicide exposure. Under glyphosate stress, the expression of six ApSODs were significantly up-regulated at 7 d; the expression of four ApSODs were significantly down-regulated at 1 d under isoproturon stress. These results indicate that ApSODs showed different expression patterns under the stress of different herbicides. This study systematically identified and characterized the ApSOD family members and provided a preliminary description of the expression characteristics of six genes under herbicide stress, laying a foundation for further research on the biological role of ApSODs in response to herbicide stress.

Key words: superoxide dismutase, Alternanthera philoxeroides, expression pattern analysis, herbicide