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The mechanism of color difference between purple-red and green Partridge tea leaves.

BACKGROUND
Partridge tea (Mallotus oblongifolius) is used as an important beverage and medical plant in Hainan province of China. Although some informations of the morphology, cytology and genetics of partridge tea have been reported somewhere, but the knowledge about this plant is still very limited. Leaves are the most important part for every tea plants as the nutrition and other functional compounds are from leaves. The leaves of different cultivars of partridge tea are different in colors and functions. The molecular mechanism of color formation of Partridge tea leaf is still unclear. We reveal the molecular mechanism of colors difference between purple-red and green Partridge tea leaves through metabolome and transcriptome analysis.


RESULTS
We identified 665 compounds in the two partridge tea cultivars through metabolome analysis. Among these compounds, 324 were different in contents between the two cultivars. We also annotated 50042 unigenes in the two cultivars by transcriptome analysis. 9665 unigenes of them were differently expressed between the two cultivars. Integrated analysis of the metabolome and transcriptome datas, we found that the compounds and genes involved in anthocyanin biosynthesis were up-regulated in the purple-red leaves, compared with the green leaves.


CONCLUSION
Our results showed that the anthocyanin biosynthesis pathway genes were up-regulated and results in the up-regulation of the anthocyanin, which made the leaf color purple-red. Our study reveals the molecular mechanism of the colors difference between purple-red and green Partridge tea, and lays a foundation for Partridge tea genetic breeding and volatile components utilization. This article is protected by copyright. All rights reserved.