Biotechnology Bulletin ›› 2023, Vol. 39 ›› Issue (4): 136-147.doi: 10.13560/j.cnki.biotech.bull.1985.2022-0533

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Genome-wide Identification of Catalase Family Genes and Expression Analysis in Kiwifruit

LAI Rui-lian(), FENG Xin, GAO Min-xia, LU Yu-dan, LIU Xiao-chi, WU Ru-jian, CHEN Yi-ting()   

  1. Fruit Research Institute, Fujian Academy of Agricultural Sciences, Fuzhou 350013
  • Received:2022-04-29 Online:2023-04-26 Published:2023-05-16

Abstract:

Catalase(CAT)is one of the main antioxidant enzymes in plants. In order to reveal the sequence characteristics and expression patterns of kiwifruit CAT family genes(AcCATs), genome-wide identification and expression analysis were performed. The genome-wide identification and bioinformatics analysis of AcCATfamily genes were carried out, and its expression changes in different organs and during fruit storage were analyzed. Nine genes of AcCAT family were identified from kiwifruit genome using bioinformatics method and named as AcCAT1-AcCAT9 respectively according to their chromosome location information. There were high similarities in protein physicochemical properties, gene structure, conserved motifs and cis-acting elements in different members. AcCAT genes were unevenly distributed on four chromosomes, five AcCAT genes formed two tandem duplication gene clusters, and six AcCAT genes had segmental duplication. By psRNAtarget analysis, AcCAT genes were predicted to be mainly regulated by miR166 family members. Phylogenetic analysis showed that 23 CAT proteins from kiwifruit, Camellia sinensis, Gossypium hirsutum and Oryza sativa could be classified into three groups, and the classification was not completely conducted by species. Transcriptome analysis of different kiwifruit organs revealed that AcCAT3 expressed highly in the root, AcCAT1 and AcCAT4 expressed highly in the flower, AcCAT2, AcCAT5, AcCAT6, AcCAT8 and AcCAT9 were mainly expressed in the leaf, while AcCAT7 was up-expressed both in the root and flower. During the storage of kiwifruit, the expression levels of AcCAT5and AcCAT6 decreased gradually, but AcCAT1 and AcCAT2 were up-expressed in early stage, while the expression of AcCAT3, AcCAT4 and AcCAT8 increased in late stage. Additionally, the expressions of miR166 family members increased during this process. AcCAT family genes are conservative in evolution, and they play important regulatory roles in the growth and during the storage of kiwifruit.

Key words: kiwifruit, catalase, genome-wide identification, gene expression