数字农科院2.0

Fine Mapping of fw6.3, a Major-Effect Quantitative Trait Locus That Controls Fruit Weight in Tomato

文献类型： 外文期刊

作者： Yu Ning;Kai Wei;Shanshan Li;Li Zhang;Ziyue Chen;Feifei Lu;Pei Yang;Mengxia Yang;Xiaolin Liu;Xiaoyan Liu;Xiaotian Wang;Xue Cao;Xiaoxuan Wang;Yanmei Guo;Lei Liu;Xin Li;Yongchen Du;Junming Li;Zejun Huang

作者机构：

关键词： fine mapping;fruit weight;fw6.3;overdominance;soluble solids content;tomato

期刊名称： Plants

ISSN： 2223-7747

年卷期： 2023 年 12 卷 11 期

页码：

收录情况： SCIE（2023版）

摘要： Tomato (Solanum lycopersicum) is a widely consumed vegetable, and the tomato fruit weight is a key yield component. Many quantitative trait loci (QTLs) controlling tomato fruit weight have been identified, and six of them have been fine-mapped and cloned. Here, four loci controlling tomato fruit weight were identified in an F2 population through QTL seq.; fruit weight 6.3 (fw6.3) was a major-effect QTL and its percentage of variation explanation (R2) was 0.118. This QTL was fine-mapped to a 62.6 kb interval on chromosome 6. According to the annotated tomato genome (version SL4.0, annotation ITAG4.0), this interval contained seven genes, including Solyc06g074350 (the SELF-PRUNING gene), which was likely the candidate gene underlying variation in fruit weight. The SELF-PRUNING gene contained a single-nucleotide polymorphism that resulted in an amino acid substitution in the protein sequence. The large-fruit allele of fw6.3 (fw6.3HG) was overdominant to the small-fruit allele fw6.3RG. The soluble solids content was also increased by fw6.3HG. These findings provide valuable information that will aid the cloning of the FW6.3 gene and ongoing efforts to breed tomato plants with higher yield and quality via molecular marker-assisted selection.

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