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Journal of Integrative Agriculture  2023, Vol. 22 Issue (6): 1720-1739    DOI: 10.1016/j.jia.2023.04.031
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Molecular characterization of the SAUR gene family in sweet cherry and functional analysis of PavSAUR55 in the process of abscission
HOU Qian-dong1*, HONG Yi1*, WEN Zhuang1, SHANG Chun-qiong2, LI Zheng-chun2, CAI Xiao-wei1, QIAO Guang1, WEN Xiao-peng1#

1 Key Laboratory of Plant Resource Conservation and Germplasm Innovation in Mountainous Region (Ministry of Education), College of Life Sciences/Institute of Agro-bioengineering, Guizhou University, Guiyang 550025, P.R.China

2 College of Forestry/Institute for Forest Resources & Environment of Guizhou, Guizhou University, Guiyang 550025, P.R.China

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Small auxin up RNA (SAUR) is a large gene family that is widely distributed among land plants.  In this study, a comprehensive analysis of the SAUR family was performed in sweet cherry, and the potential biological functions of PavSAUR55 were identified using the method of genetic transformation.  The sweet cherry genome encodes 86 SAUR members, the majority of which are intron-less.  These genes appear to be divided into seven subfamilies through evolution.  Gene duplication events indicate that fragment duplication and tandem duplication events occurred in the sweet cherry.  Most of the members mainly underwent purification selection pressure during evolution.  During fruit development, the expression levels of PavSAUR16/45/56/63 were up-regulated, and conversely, those of PavSAUR12/61 were down-regulated.  Due to the significantly differential expressions of PavSAUR13/16/55/61 during the fruitlet abscission process, they might be the candidate genes involved in the regulation of physiological fruit abscission in sweet cherry.  Overexpression of PavSAUR55 in Arabidopsis produced earlier reproductive growth, root elongation, and delayed petal abscission.  In addition, this gene did not cause any change in the germination time of seeds and was able to increase the number of lateral roots under abscisic acid (ABA) treatment.  The identified SAURs of sweet cherry play a crucial role in fruitlet abscission and will facilitate future insights into the mechanism underlying the heavy fruitlet abscission that can occur in this fruit crop.

Keywords:  sweet cherry        small auxin up RNA        gene family        expression profile        fruitlet abscission  
Received: 16 September 2022   Online: 28 April 2023   Accepted: 24 March 2023
Fund: This project was supported by grants from the National Natural Science Foundation of China (32272649) and the Core Program of Guizhou Education Department, China (KY 2021-038).
About author:  HOU Qian-dong, E-mail:; HONG Yi, E-mail:; #Correspondence WEN Xiao-peng, E-mail: *These authors contributed equally to this work.

Cite this article: 

HOU Qian-dong, HONG Yi, WEN Zhuang, SHANG Chun-qiong, LI Zheng-chun, CAI Xiao-wei, QIAO Guang, WEN Xiao-peng. 2023. Molecular characterization of the SAUR gene family in sweet cherry and functional analysis of PavSAUR55 in the process of abscission. Journal of Integrative Agriculture, 22(6): 1720-1739.

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