The Combined Analysis of Transcriptome and Metabolome Provides Insights into Purple Leaves in <i>Eruca vesicaria</i> subsp. <i>sativa</i>
Dandan Xi,
Xiaofeng Li,
Changwei Zhang,
Lu Gao,
Yuying Zhu,
Shiwei Wei,
Ying Li,
Mingmin Jiang,
Hongfang Zhu,
Zhaohui Zhang
Affiliations
Dandan Xi
Shanghai Key Laboratory of Protected Horticultural Technology, Horticultural Research Institute, Zhuanghang Comprehensive Experiment Station, Shanghai Academy of Agricultural Sciences, Shanghai 201403, China
Xiaofeng Li
Shanghai Key Laboratory of Protected Horticultural Technology, Horticultural Research Institute, Zhuanghang Comprehensive Experiment Station, Shanghai Academy of Agricultural Sciences, Shanghai 201403, China
Changwei Zhang
State Key Laboratory of Crop Genetics and Germplasm Enhancement, College of Horticulture, Nanjing Agricultural University, Nanjing 210095, China
Lu Gao
Shanghai Key Laboratory of Protected Horticultural Technology, Horticultural Research Institute, Zhuanghang Comprehensive Experiment Station, Shanghai Academy of Agricultural Sciences, Shanghai 201403, China
Yuying Zhu
Shanghai Key Laboratory of Protected Horticultural Technology, Horticultural Research Institute, Zhuanghang Comprehensive Experiment Station, Shanghai Academy of Agricultural Sciences, Shanghai 201403, China
Shiwei Wei
Shanghai Agrobiological Gene Center, Shanghai 201106, China
Ying Li
State Key Laboratory of Crop Genetics and Germplasm Enhancement, College of Horticulture, Nanjing Agricultural University, Nanjing 210095, China
Mingmin Jiang
Institute of Vegetable Science, Suzhou Academy of Agricultural Sciences, Suzhou 215155, China
Hongfang Zhu
Shanghai Key Laboratory of Protected Horticultural Technology, Horticultural Research Institute, Zhuanghang Comprehensive Experiment Station, Shanghai Academy of Agricultural Sciences, Shanghai 201403, China
Zhaohui Zhang
Shanghai Key Laboratory of Protected Horticultural Technology, Horticultural Research Institute, Zhuanghang Comprehensive Experiment Station, Shanghai Academy of Agricultural Sciences, Shanghai 201403, China
Background: Arugula is an essential oil crop of cruciferous species worldwide and serves as a salad vegetable. Purple plant leaves provide nutrients benefiting human beings and are mainly attributed to high anthocyanins. In this study, we collected a purple arugula cultivar with purple leaves and a green arugula with green leaves. The genetic bases and mechanisms underlying purple leaf formation in arugula remain unclear. Therefore, we conducted integrative metabolomics and transcriptomics of two arugula cultivars with different leaf colors. Methods: To study the underlying mechanisms, transcriptomic and metabolomic analyses were carried out. Results: Metabolomic analysis revealed that 84 of 747 metabolites were significantly differentially expressed, comprising 30 depleted and 49 enriched metabolites. Further analysis showed that cyanidin is the main components responsible for the purple color. A total of 144,790 unigenes were obtained by transcriptomic analysis, with 13,204 unigenes differentially expressed, comprising 8120 downregulated and 5084 upregulated unigenes. Seven structural genes, PAL, C4H, 4CL, CHS, CCoAOMT, LDOX, and UFGT, were identified as candidate genes associated with anthocyanin accumulation through combined analysis of transcriptome and metabolome. Conclusions: Collectively, the differences in the expression levels of PAL, C4H, 4CL, CHS, CCoAOMT, LDOX, and UFGT might be responsible for purple leaf coloration, providing important data for the discovery of candidate genes and molecular bases controlling the purple leaves in arugula.
