Wang Wu, Feng Jiao, Wei Lingling, Khalil-Ur-Rehman Muhammad, Nieuwenhuizen Niels J, Yang Lina, Zheng Huan, Tao Jianmin
College of Horticulture, Nanjing Agricultural University, 210095 Nanjing, China.
The New Zealand Institute for Plant and Food Research Ltd (PFR), Private Bag 92169 Auckland, New Zealand.
J Agric Food Chem. 2021 Feb 3;69(4):1413-1429. doi: 10.1021/acs.jafc.0c06591. Epub 2021 Jan 22.
Terpenes and their derivatives are important biomarkers of grape quality as they contribute to the flavor and aroma of grapes. However, the molecular basis of terpene biosynthesis throughout the grapevine phenological developmental cycle remains elusive. Our current study investigates the free and bound terpene biosynthesis of berries at different phenological stages from preveraison to harvest. Detailed gene expression (transcriptomics) analysis, terpenoid volatile production by gas chromatography-mass spectrometry (GC-MS), and transient expression were employed. Our results show that concentrations of most individual terpenes at different stages are distinctive and increase from preveraison to the veraison stage followed by a decrease from veraison to maturity. The combined transcriptomic analysis and terpene profiling revealed that 22 genes belonging to the MEP pathway and multiple classes of transcription factor family members including bHLH and several hormone biosynthesis- or signaling-related genes likely participate in the regulation of terpenoid biosynthesis according to their specific expression patterns in berries. Quantitative real-time polymerase chain expression analysis of 8 key differentially expressed genes in MEP pathways and further 12 randomly selected genes was performed during 8 sampling stages and validated the RNA-seq-derived expression profiles. To further confirm the function of a subset of the differentially expressed genes, we investigated the effects of combined overexpression of 1-deoxy-d-xylulose-5-phosphate synthase (), 1-deoxy-d-xylulose-5-phosphate reductoisomerase (), and terpene synthase () on the production of terpenes by transient overexpression in leaves. The overall developmental patterns of total terpenes and gene expression profiles will help guide the functional analyses of further candidate genes important for terpene biosynthesis of grape as well as identifying the master transcriptional and hormonal regulators of this pathway in the future.
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