Genome-Wide Analysis of SAUR Gene Family Identifies a Candidate Associated with Fruit Size in Loquat (Eriobotrya japonica Lindl.)
文献类型： 外文期刊
作者： Peng, Ze 1 ; Li, Wenxiang 1 ; Gan, Xiaoqing 1 ; Zhao, Chongbin 1 ; Paudel, Dev 3 ; Su, Wenbing 4 ; Lv, Juan 5 ; Lin, Shunquan 1 ; Liu, Zongli 1 ; Yang, Xianghui 1 ;
作者机构： 1.South China Agr Univ, State Key Lab Conservat & Utilizat Subtrop Agrobi, Guangzhou 510642, Peoples R China
2.South China Agr Univ, Coll Hort, Minist Agr & Rural Affairs, Key Lab Innovat & Utilizat Hort Crop Resources So, Guangzhou 510642, Peoples R China
3.Univ Florida, Gulf Coast Res & Educ Ctr, Dept Environm Hort, IFAS, Wimauma, FL 33598 USA
4.Fujian Acad Agr Sci, Fruit Res Inst, Fuzhou 350013, Peoples R China
5.South China Agr Univ, Coll Mat & Energy, Guangzhou 510642, Peoples R China
关键词： auxin; cell expansion; fruit size; loquat; SAUR
期刊名称：INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES （ 影响因子：6.208； 五年影响因子：6.628 ）
ISSN：
年卷期： 2022 年 23 卷 21 期
页码：
收录情况： SCI
摘要： Fruit size is an important fruit quality trait that influences the production and commodity values of loquats (Eriobotrya japonica Lindl.). The Small Auxin Upregulated RNA (SAUR) gene family has proven to play a vital role in the fruit development of many plant species. However, it has not been comprehensively studied in a genome-wide manner in loquats, and its role in regulating fruit size remains unknown. In this study, we identified 95 EjSAUR genes in the loquat genome. Tandem duplication and segmental duplication contributed to the expansion of this gene family in loquats. Phylogenetic analysis grouped the SAURs from Arabidopsis, rice, and loquat into nine clusters. By analyzing the transcriptome profiles in different tissues and at different fruit developmental stages and comparing two sister lines with contrasting fruit sizes, as well as by functional predictions, a candidate gene (EjSAUR22) highly expressed in expanding fruits was selected for further functional investigation. A combination of Indoleacetic acid (IAA) treatment and virus-induced gene silencing revealed that EjSAUR22 was not only responsive to auxin, but also played a role in regulating cell size and fruit expansion. The findings from our study provide a solid foundation for understanding the molecular mechanisms controlling fruit size in loquats, and also provide potential targets for manipulation of fruit size to accelerate loquat breeding.
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