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The Sepal Curvature Regulator Gene Encodes a MADS-Box Protein Regulating Sepal Shape in Tomato
Xue Gong1, Yingjie Sun1, Hao Tian1
1College of Horticulture and Landscape Architecture, Northeast Agricultural University, Harbin150030, China.
Scientists identified the sepal curvature regulator (SCR) gene in tomato. This gene controls sepal shape, impacting fruit quality and providing valuable resources for tomato breeding.
Area of Science:
- Plant genetics
- Molecular biology
- Agricultural science
Background:
- Tomato sepal morphology significantly influences fruit external quality.
- The genetic mechanisms regulating sepal curvature are not well understood.
Purpose of the Study:
- To identify the gene responsible for sepal curvature in tomato.
- To understand the genetic regulation of sepal development.
Main Methods:
- Construction of a segregating population from noncurling and inward-curling tomato lines.
- Fine-mapping of the sepal curvature locus using BSA-seq and genetic mapping.
- Analysis of candidate genes, including expression levels and effects of knockout mutations.
Main Results:
- A major sepal curvature locus was mapped to a 25-kb region on chromosome 4.
- The Type I MADS-box gene Solyc04g064860, designated SCR, was identified as the causal gene.
- SCR expression was lower in inward-curling lines, and SCR knockout induced sepal curling and altered hormone levels.
Conclusions:
- SCR is a critical regulator of tomato sepal curvature.
- Findings provide insights into sepal development and genetic resources for breeding.
- Understanding SCR function can lead to improved tomato fruit quality.
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