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Acta Horticulturae Sinica ›› 2021, Vol. 48 ›› Issue (12): 2360-2374.doi: 10.16420/j.issn.0513-353x.2020-0911

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Genome-wide Identification and Expression Analysis of Prunus avium Gretchen Hagen 3(GH3)Gene Family

HOU Qiandong1, SHEN Tianjiao1, YU Huanhuan1, QIU Zhilang1, WEN Zhuang1, ZHANG Huimin1,2, WU Yawei3, WEN Xiaopeng1,*()   

  1. 1Key Laboratory of Plant Resource Conservation and Germplasm Innovation in Mountainous Region(Ministry of Education),Collaborative Innovation Center for Mountain Ecology & Agro-Bioengineering(CICMEAB),Institute of Agro-bioengineering,College of Life Sciences,Guizhou University,Guiyang 550025,China
    2Institute for Forest Resources & Environment of Guizhou,College of Forestry,Guizhou University,Guiyang 550025,China
    3Institute of Fruit Tree Research,Guizhou Provincial Academy of Agricultural Sciences,Guiyang 550006,China
  • Received:2021-01-06 Revised:2021-05-06 Published:2022-01-04
  • Contact: WEN Xiaopeng E-mail:xpwensc@hotmail.com

Abstract:

Auxin plays a crucial role in regulating the growth and development of plants. The acyl acid amido synthetase Gretchen Hagen 3(GH3)may modulate auxin levels via conjugting both indole-3-acetic acid(IAA)and salicylic acid(SA)in response to environment changes. In the current investigation,genome-wide identification and comprehensive analysis of the GH3 gene family in sweet cherry(Prunus avium)were conducted using the genomic sequence. Totally,eight members of PavGH3 genes were identified from the whole genome of sweet cherry,which are not evenly distributed on the chromosomes,with the coding sequence of 1 683-1 851 bp,most of which were forecasted in chloroplast. The analysis of gene structure and domain revealed that PavGH3 demonstrated high similarity among the members,and the number of exons was three or four. A total of 16 conserved domains were obtained,and the number of the conserved domains varied among the members. These gene members were clustered into two major groups(I and II),based on phylogenetic analysis. Sequence analysis of promoters showed many cis-regulatory elements which presumably responsed to phytohormones such as abscisic acid,methyl jasmonate etc. Synteny block indicated that PavGH3.5 and PavGH3.6 showed collinearity with GH3 in Arabidopsis thaliana,suggesting that they were evolutionarily conserved. Multiple sequence alignment demonstrated that these members are highly similar and conserved. As detected by qRT-PCR in 17 tissues. PavGH3.2,PavGH3.3 and PavGH3.6 were highy expressed in these tissues. PavGH3.4 and PavGH3.5 were up-regulated in the dropped-fruit of the second physiological abscission in comparison with that of the first one. Compared with retention fruits,surprisingly,PavGH3.5 and PavGH3.7 were significantly down-regulated in the first physiological fruit drops,PavGH3.4 and PavGH3.6 were up-regulated. IAA,GA3,ABA and MeJA were used to foliar application,and PavGH3.2,PavGH3.3,PavGH3.6 and PavGH3.7 were differentially expressed in response to the type and application stage of the phytohormones,however,no responses were observed in the others. Therefore,it is speculated that the PavGH3 gene family is considerably involved in the regulation of the growth and development of sweet cherry,and probably in the fruit abscission.

Key words: Prunus avium, Gretchen Hagen 3, gene family, auxin response, expression analysis

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