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A novel F-box gene, SlSE2.2, is responsible for the stigma exsertion degree in tomato (Solanum lycopersicum)

文献类型： 外文期刊

作者： Zhao, Pan 1 ; Zhang, Yanhong 1 ; Sun, Zhengliang 1 ; Cheng, Baohui 1 ; Meng, Liangzhe 1 ; Muhammad, Tayeb 3 ; Yao, Yuhe 1 ; Abbas, Muhammad Mehran 1 ; Zhan, Xiangqiang 1 ; Zhang, Fei 1 ; Liang, Yan 1 ;

作者机构： 1.Northwest A&F Univ, Coll Hort, Xian 712100, Shaanxi, Peoples R China

2.Northwest A&F Univ, State Agr Minist Lab Northwest Hort Plant Germplas, Xian 712100, Shaanxi, Peoples R China

3.Xinjiang Acad Agr Sci, Inst Hort Crops, Key Lab Genome Res & Genet Improvement Xinjiang Ch, Urumqi, Peoples R China

关键词： Fine mapping; SlSE2.2 gene; Stigma exsertion degree; Hormones; Tomato

期刊名称：PLANT SCIENCE （ 影响因子：4.1； 五年影响因子：5.1 ）

ISSN： 0168-9452

年卷期： 2025 年 356 卷

页码：

收录情况： SCI

摘要： Tomato stigma exsertion is an important trait in positional sterility genotypes, which can eliminate the need for manual emasculation and promote hybrid production. In this study, we discovered a new tomato accession, J59, with a stably inherited stigma exsertion trait. To explore the regulatory genes of the stigma exsertion trait, J59 and inserted stigma genotypes M82 were crossed to obtain mapping populations. Through three years mapping, a quantitative trait locus (QTL) associated with the stigma exsertion trait was narrowed down to a 52.635 kb interval on chromosome 2, Solyc02g087270 was identified as the candidate gene responsible for this trait, named SlSE2.2. This gene encoded an F-box protein of the FBA subfamily. Sequences analysis revealed that an 11 bp deletion occurred in the first exon of SlSE2.2 in J59, resulting in premature termination of translation. Subcellular localization revealed that SlSE2.2 is located to the nucleus. Knockout of SlSE2.2 increased anther and style lengths, which reduced the values of anther length minus pistil length, changing the relative length of anthers and pistils, called stigma exsertion degree, whereas, overexpression of SlSE2.2 showed the opposite phenotype. Hormone levels analysis revealed that SlSE2.2 negatively modulated IAA, ETH, and JA levels and positively modulated ABA content. Transcriptomic analysis showed that SlSE2.2 affected the expression of SlIAA19, SlIAA36, SlETR6, SlJAZ, and SlSnRK2 related to the hormone signal transduction. This study identified the important role of a new gene, SlSE2.2, which provided a helpful insight to explore the regulatory mechanisms of stigma exsertion degree in tomato.

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