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The Tea Tree Genome Provides Insights into Tea Flavor and Independent Evolution of Caffeine Biosynthesis

  • [设施]:种质库
  • [期刊/会议名称]:Molecular Plant
  • [摘要]:Teaistheworld’soldestandmostpopularcaffeine-containingbeveragewithimmenseeconomic,medicinal, andculturalimportance.Here,wepresentthefirsthigh-qualitynucleotidesequenceoftherepeat-rich(80.9%), 3.02-GbgenomeofthecultivatedteatreeCamelliasinensis.Weshowthatanextraordinarilylargegenomesize ofteatreeisresultedfromtheslow,steady,andlong-termamplificationofafewLTRretrotransposonfamilies. Inadditiontoarecentwhole-genomeduplicationevent,lineage-specificexpansionsofgenesassociatedwith flavonoid metabolic biosynthesis were discovered, which enhance catechin production, terpene enzyme activation,andstresstolerance,importantfeaturesforteaflavorandadaptation.Wedemonstrateanindepen- dent and rapid evolution of the tea caffeine synthesis pathway relative to cacao and coffee. A comparative study among 25 Camellia species revealed that higher expression levels of most flavonoid- and caffeine- but not theanine-related genes contribute to the increased production of catechins and caffeine and thus enhancetea-processingsuitabilityandteaquality.Thesenovelfindingspavethewayforfurthermetabolomic and functional genomic refinement of characteristic biosynthesis pathways and will help develop a more diversified set of tea flavors that would eventually satisfy and attract more tea drinkers worldwide.
  • [发表日期]:2017
  • [第一作者]:En-Hua Xia , Hai-Bin Zhang , Jun Sheng , Kui Li
  • [第一作者单位]: Plant Germplasm and Genomics Center, Germplasm Bank of Wild Species in Southwestern China, Kunming Institute of Botany, Chinese Academy of Sciences
  • [通讯作者]: Evan E. Eichler and Li-Zhi Gao
  • [通讯作者单位]: Plant Germplasm and Genomics Center, Germplasm Bank of Wild Species in Southwestern China, Kunming Institute of Botany, Chinese Academy of Sciences
  • [论文类型]:0
  • [期刊分类]:SCI1区
  • [学科分类]:生物学_ 生物化学
  • [影响因子]:6.885
  • [关键词]: Tea tree genome, Comparative genomics, Tea flavor, Tea-proccessing suitability, Global adaptation, Caffeine biosynthesis
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