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Plant Physiol

Title:		Sensory-Directed Genetic and Biochemical Characterization of Volatile Terpene Production in Kiwifruit
Author(s):		Zeng Y; Wang MY; Hunter DC; Matich AJ; McAtee PA; Knabel M; Hamiaux C; Popowski EA; Jaeger SR; Nieuwenhuizen NJ; Yauk YK; Atkinson RG;
Address:		"Key Laboratory of Horticultural Plant Biology, College of Horticulture and Forestry Science, Huazhong Agricultural University, Wuhan 430070, P.R. China. The New Zealand Institute for Plant and Food Research Ltd. (PFR), Auckland 1142, New Zealand. PFR, Palmerston North 4442, New Zealand. PFR, Te Puke 3182, New Zealand. The New Zealand Institute for Plant and Food Research Ltd. (PFR), Auckland 1142, New Zealand ross.atkinson@plantandfood.co.nz"
Journal Title:		Plant Physiol
Year:		2020
Volume:		20200317
Issue:		1
Page Number:		51 - 66
DOI:		10.1104/pp.20.00186
ISSN/ISBN:		1532-2548 (Electronic) 0032-0889 (Print) 0032-0889 (Linking)
Abstract:		"Terpene volatiles are found in many important fruit crops, but their relationship to flavor is poorly understood. Here, we demonstrate using sensory descriptive and discriminant analysis that 1,8-cineole contributes a key floral/eucalyptus note to the aroma of ripe 'Hort16A' kiwifruit (Actinidia chinensis). Two quantitative trait loci (QTLs) for 1,8-cineole production were identified on linkage groups 27 and 29a in a segregating A. chinensis population, with the QTL on LG29a colocating with a complex cluster of putative terpene synthase (TPS)-encoding genes. Transient expression in Nicotiana benthamiana and analysis of recombinant proteins expressed in Escherichia coli showed four genes in the cluster (AcTPS1a-AcTPS1d) encoded functional TPS enzymes, which produced predominantly sabinene, 1,8-cineole, geraniol, and springene, respectively. The terpene profile produced by AcTPS1b closely resembled the terpenes detected in red-fleshed A chinensis AcTPS1b expression correlated with 1,8-cineole content in developing/ripening fruit and also showed a positive correlation with 1,8-cineole content in the mapping population, indicating the basis for segregation is an expression QTL. Transient overexpression of AcTPS1b in Actinidia eriantha fruit confirmed this gene produced 1,8-cineole in Actinidia Structure-function analysis showed AcTPS1a and AcTPS1b are natural variants at key TPS catalytic site residues previously shown to change enzyme specificity in vitro. Together, our results indicate that AcTPS1b is a key gene for production of the signature flavor terpene 1,8-cineole in ripe kiwifruit. Using a sensory-directed strategy for compound identification provides a rational approach for applying marker-aided selection to improving flavor in kiwifruit as well as other fruits"
Keywords:		"Actinidia/*metabolism Alkyl and Aryl Transferases/*metabolism Fruit/*metabolism Gene Expression Regulation, Plant/physiology Odorants Plant Proteins/metabolism Quantitative Trait Loci/genetics Terpenes/*metabolism Volatile Organic Compounds/metabolism;"
Notes:		"MedlineZeng, Yunliu Wang, Mindy Y Hunter, Denise C Matich, Adam J McAtee, Peter A Knabel, Mareike Hamiaux, Cyril Popowski, Elizabeth A Jaeger, Sara R Nieuwenhuizen, Niels J Yauk, Yar-Khing Atkinson, Ross G eng Research Support, Non-U.S. Gov't 2020/03/19 Plant Physiol. 2020 May; 183(1):51-66. doi: 10.1104/pp.20.00186. Epub 2020 Mar 17"