Chinese Bulletin of Botany ›› 2024, Vol. 59 ›› Issue (2): 188-203.DOI: 10.11983/CBB23107

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Identification of XTH Family Genes in Antirrhinum majus and Screening of Genes Involoved in Sclerotinia sclerotiorum Resistance and Stamen Petalization

Hanqian Zhao, Jiayi Song, Jie Yang, Yongjing Zhao, Wennian Xia, Weizhuo Gu, Zhongyi Wang, Nan Yang, Huizhen Hu*   

  1. Yunnan Province Engineering Research Center for Functional Flower Resources and Industrialization, College of Landscape Architecture and Horticulture Sciences, Southwest Forestry University, Kunming 650224, China
  • Received:2023-08-07 Revised:2024-01-28 Online:2024-03-01 Published:2024-01-30
  • Contact: Huizhen Hu

Abstract:

Xyloglucan endotransglucosylase/hydrolases (XTH) belongs to glycoside hydrolase, 16 family (GH16) and is a class of enzymes that mediate the construction and recombination of xyglucan-cellulose skeleton. To explore the potential biological functions of XTH family genes in Antirrhinum majus. In this paper, bioinformatics analysis, RNA-seq analysis and qRT-PCR were used to investigate the expression levels of the family genes in the petalized and non-petalized stamens and disease-resistant materials. The results showed that the main conserved motif of 33 identified AmXTH genes was ExDxE, which was divided into 3 subgroups. Most of the cis-acting elements of AmXTH promoter are growth and development, disease resistance and stress resistance. RNA-seq and qRT-PCR revalidation finally unearthed four candidate genes (AmXTH3, 14, 18, and 33) and one candidate genes (AmXTH23) for positively mediated Sclerotinia sclerotiorum resistance. There were 12 positive AmXTH candidate genes (AmXTH1, 7, 9, 11, 21, 22, 23, 24, 26, 28, 29 and 33) and 2 negative AmXTH candidate genes (AmXTH15 and 31). Among them, AmXTH23 and 33 may play a role in both the resistance of A. majus to S. sclerotiorum resistance and stamen petalization. In this study, the candidate AmXTH genes involved in S. sclerotiorum resistance and stamen petalization of A. majus were preliminarily excavated, which laid a foundation for further revealing the gene function.

Key words: A. majus, Xyloglucan endotransglucosylase/hydrolases family, S. sclerotiorum resistance, stamen petalization, differential gene expression