FIS1 encodes a GA2-oxidase that regulates fruit firmness in tomato

Ren Li, Shuai Sun, Haijing Wang, Ketao Wang, Hong Yu, Zhen Zhou, Peiyong Xin, Jinfang Chu, Tongmin Zhao, Huanzhong Wang, Jiayang Li and Xia Cui ()
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Ren Li: Chinese Academy of Agricultural Sciences
Shuai Sun: Chinese Academy of Agricultural Sciences
Haijing Wang: Chinese Academy of Agricultural Sciences
Ketao Wang: Zhejiang Agriculture and Forestry University
Hong Yu: Chinese Academy of Sciences
Zhen Zhou: Chinese Academy of Agricultural Sciences
Peiyong Xin: Chinese Academy of Sciences
Jinfang Chu: Chinese Academy of Sciences
Tongmin Zhao: Jiangsu Academy of Agricultural Science
Huanzhong Wang: University of Connecticut
Jiayang Li: Chinese Academy of Sciences
Xia Cui: Chinese Academy of Agricultural Sciences

Nature Communications, 2020, vol. 11, issue 1, 1-12

Abstract: Abstract Fruit firmness is a target trait in tomato breeding because it facilitates transportation and storage. However, it is also a complex trait and uncovering the molecular genetic mechanisms controlling fruit firmness has proven challenging. Here, we report the map-based cloning and functional characterization of qFIRM SKIN 1 (qFIS1), a major quantitative trait locus that partially determines the difference in compression resistance between cultivated and wild tomato accessions. FIS1 encodes a GA2-oxidase, and its mutation leads to increased bioactive gibberellin content, enhanced cutin and wax biosynthesis, and increased fruit firmness and shelf life. Importantly, FIS1 has no unfavorable effect on fruit weight or taste, making it an ideal target for breeders. Our study demonstrates that FIS1 mediates gibberellin catabolism and regulates fruit firmness, and it offers a potential strategy for tomato breeders to produce firmer fruit.

Date: 2020
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DOI: 10.1038/s41467-020-19705-w

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