期刊
FRONTIERS IN PLANT SCIENCE
卷 12, 期 -, 页码 -出版社
FRONTIERS MEDIA SA
DOI: 10.3389/fpls.2021.802864
关键词
CsOr gene; orange endocarp; beta-carotene; genotyping-by-sequencing; whole-genome sequencing; cucumber
资金
- Cooperative Research Program for National Agricultural Genome Program Rural Development Administration, Korea [PJ01343201]
- Korea Institute of Planning and Evaluation for Technology in Food, Agriculture, Forestry, and Fisheries (IPET) - Ministry of Agriculture, Food, and Rural Affairs (MAFRA) [821009-03]
This study identified the orange endocarp color gene in cucumber through genetic mapping and whole-genome sequencing, revealing that a single recessive gene encodes a chaperone DnaJ protein responsible for the orange endocarp phenotype. Point mutations in the CsOr gene were found to increase beta-carotene content in the endocarp tissue, providing insights into developing beta-carotene-rich cucumber varieties.
The cucumber is a major vegetable crop around the world. Fruit flesh color is an important quality trait in cucumber and flesh color mainly depends on the relative content of beta-carotene in the fruits. The beta-carotene serves as a precursor of vitamin A, which has dietary benefits for human health. Cucumbers with orange flesh contain a higher amount of beta-carotene than white fruit flesh. Therefore, development of orange-fleshed cucumber varieties is gaining attention for improved nutritional benefits. In this study, we performed genotyping-by-sequencing (GBS) based on genetic mapping and whole-genome sequencing to identify the orange endocarp color gene in the cucumber breeding line, CS-B. Genetic mapping, genetic sequencing, and genetic segregation analyses showed that a single recessive gene (CsaV3_6G040750) encodes a chaperone DnaJ protein (DnaJ) protein at the Cucumis sativus(CsOr) locus was responsible for the orange endocarp phenotype in the CS-B line. The Or gene harbored point mutations T13G and T17C in the first exon of the coding region, resulting in serine to alanine at position 13 and isoleucine to threonine at position 17, respectively. CS-B line displayed increased beta-carotene content in the endocarp tissue, corresponding to elevated expression of CsOr gene at fruit developmental stages. Identifying novel missense mutations in the CsOr gene could provide new insights into the role of Or mechanism of action for orange fruit flesh in cucumber and serve as a valuable resource for developing beta-carotene-rich cucumbers varieties with increased nutritional benefits.
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