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Acta Horticulturae Sinica ›› 2023, Vol. 50 ›› Issue (10): 2139-2156.doi: 10.16420/j.issn.0513-353x.2022-0752

• Genetic & Breeding · Germplasm Resources · Molecular Biology • Previous Articles     Next Articles

Genome-wide Identification and Abiotic Stress Response Analysis of PP2C Family Genes in Rosa chinensis‘Old Blush’

SHEN Yuxiao1, ZOU Jinyu1, LUO Ping2, SHANG Wenqian1, LI Yonghua1, HE Songlin1,3, WANG Zheng1,*(), SHI Liyun1,*()   

  1. 1 College of Landscape Architecture and Art,Henan Agricultural University,Zhengzhou 450002,China
    2 College of Horticulture Science,Zhejiang A & F University,Hangzhou 310000,China
    3 College of Horticulture and Landscape Architecture,Henan University of Science and Technology,Xinxiang,Henan 453003,China
  • Received:2023-05-09 Revised:2023-09-16 Online:2023-10-25 Published:2023-10-30

Abstract:

A total of 69 members of the PP2C family were identified from the genome of Rosa chinensis‘Old Blush’using bioinformatics techniques. The majority of the proteins were hydrophilic,and the amino acid lengths ranged from 122 to 1 082 amino acids,with isoelectric points ranging 4.03 and 9.34. Phylogenetic analysis indicated that PP2Cs were divided into 12 subfamily groups,and the genetic structure and conserved motif of the same subfamily had a high similarity. Segmental duplication events were the main reason for the expansion of PP2C family genes. A significant function for the PP2C family of genes in response to stress may be inferred from the prediction of the cis-elements of promoters,which revealed that nearly 85% of PP2Cs had stress response elements and phytohormone response elements. The expression of rose PP2Cs was specific in tissue and developmental stage,and some genes were involved in the response to drought and high-temperature stress. Among them,three members of subgroup A were significantly responsive to drought stress,one member of subgroup A and two members of subgroup G were significantly responsive to high-temperature stress. Using qRT-PCR,the expression patterns of 11 PP2Cs genes under ABA and dehydration treatment were examined. Six subgroup A genes (RC0G0099200,RC1G0458700,RC1G0569200,RC2G0066800,RC2G0089100 and RC5G0571100)and a subgroup G gene(RC3G0083700)showed significantly higher expression levels following two treatments,suggesting that these genes may be activated by ABA and take part in the dehydration response.

Key words: Rosa chinensis, PP2C gene family, abiotic stress, ABA, gene expression