Journal
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
Volume 66, Issue 50, Pages 13321-13327Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jafc.8b05355
Keywords
tea plant; caffeine; theobromine; quantitative trait loci
Funding
- National Natural Science Foundation of China [31500568]
- Earmarked Fund for the China Agriculture Research System [CARS-019]
- Chinese Academy of Agricultural Sciences through the Agricultural Science and Technology Innovation Program [CAAS-ASTIP-2017-TRICAAS]
- Central Public-interest Scientific Institution Basal Research Fund [1610212017004, 1610212016002]
- Major Science and Technology Project for New Crop Varieties Breeding of Zhejiang Province [2016C02053-1]
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Understanding the genetic basis of theobromine and caffeine accumulation in the tea plant is important due to their contribution to tea flavor. Quantitative trait loci (QTL) analyses were carried out to identify genetic variants associated with theobromine and caffeine contents and ratio using a pseudo-testcross population derived from an intervarietal cross between two varieties of Camellia sinensis. A total of 10 QTL controlling caffeine content (CAF), theobromine content (TBR), sum of caffeine and theobromine (SCT), and caffeine-to-theobromine ratio (CTR) were identified over four measurement years. The major QTL controlling CAF, qCAF1, was mapped onto LG01 and validated across years, explaining an average of 20.1% of the phenotypic variance. The other QTL were detected in 1 or 2 years, and of them there were four, two, and three for TBR, SCT, and CTR, respectively. The present results provide valuable information for further fine mapping and cloning functional genes and for genetic improvement in tea plant.
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