Transcriptomics Integrated with Metabolomics Unveil Carotenoids Accumulation and Correlated Gene Regulation in White and Yellow-Fleshed Turnip (Brassica rapa ssp. rapa)

Turnip (Brassica rapa ssp. rapa) is considered to be a highly nutritious and health-promoting vegetable crop, whose flesh color can be divided into yellow and white. It is widely accepted that yellow-fleshed turnips have higher nutritional value. However, reports about flesh color formation is lacki...

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Bibliographic Details
Published in:Genes 2022-05, Vol.13 (6), p.953
Main Authors: Ren, Yanjing, Han, Rui, Ma, Yidong, Li, Xiaojuan, Deng, Changrong, Zhao, Mengliang, Li, Jiang, Hou, Quangang, Zhong, Qiwen, Shao, Dengkui
Format: Article
Language:English
Subjects:
Analysis
Biosynthesis
Biotechnology
Brassica rapa
Carotenoids
Cloning
Cultivars
Gene expression
Gene regulation
Genetic aspects
Genetic engineering
Genomes
Growth
Health aspects
Inbreeding
Metabolites
Metabolomics
Methods
Nutritive value
Plasmids
Post-transcription
Quality standards
Software
Tobacco
Transcription factors
Transcriptomics
Transgenic plants
Turnips
Vegetables
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Summary:Turnip (Brassica rapa ssp. rapa) is considered to be a highly nutritious and health-promoting vegetable crop, whose flesh color can be divided into yellow and white. It is widely accepted that yellow-fleshed turnips have higher nutritional value. However, reports about flesh color formation is lacking. Here, the white-fleshed inbred line, W21, and yellow-fleshed inbred line, W25, were profiled from the swollen root of the turnip at three developmental periods to elucidate the yellow color formation. Transcriptomics integrated with metabolomics analysis showed that the PSY gene was the key gene affecting the carotenoids formation in W25. The coding sequence of BrrPSY-W25 was 1278 bp and that of BrrPSY-W21 was 1275 bp, and BrrPSY was more highly expressed in swollen roots in W25 than in W21. Transient transgenic tobacco leaf over-expressing BrrPSY-W and BrrPSY-Y showed higher transcript levels and carotenoids contents. Results revealed that yellow turnip formation is due to high expression of the PSY gene rather than mutations in the PSY gene, indicating that a post-transcriptional regulatory mechanism may affect carotenoids formation. Results obtained in this study will be helpful for explaining the carotenoids accumulation of turnips.
ISSN:2073-4425
2073-4425
DOI:10.3390/genes13060953