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Int. J. Mol. Sci. 2017, 18(12), 2705; doi:10.3390/ijms18122705

Differential Expression of VvLOXA Diversifies C6 Volatile Profiles in Some Vitis vinifera Table Grape Cultivars

1,†
,
2,†
,
1
,
1,* and 2,*
1
Department of Food Science and Engineering, College of Biological Sciences and Technology, Beijing Forest University, Beijing 100083, China
2
Beijing Academy of Forestry and Pomology Sciences, Beijing 100093, China
These authors contributed equally to this work.
*
Authors to whom correspondence should be addressed.
Received: 21 October 2017 / Revised: 1 December 2017 / Accepted: 2 December 2017 / Published: 20 December 2017
(This article belongs to the Section Molecular Botany)
View Full-Text   |   Download PDF [1990 KB, uploaded 20 December 2017]   |  

Abstract

C6 volatiles are synthesized through lipoxygenase-hydroperoxide lyase (LOX-HPL) pathway and these volatiles play important roles in the aromatic quality of grape berries. This study investigated the evolution of both C6 volatiles and the key genes in the LOX-HPL pathway in different table grape cultivars during the berry development period, and further assessed the correlation between the accumulation of C6 volatiles and the expression of these genes in these cultivars. Results showed that hexanal, (E)-2-hexenal, (E)-2-hexen-1-ol and (Z)-3-hexen-1-ol were found to be the dominant C6 volatiles in these ripened grape cultivars under two consecutive vintages, and their flavor notes were incorporated in the overall aroma of these cultivars. The cultivar “Xiangfei” showed the most abundant level of C6 aldehydes and C6 acid, whereas the cultivar “Tamina” and “Moldova” possessed the highest C6 alcohol content. The “Muscat of Alexandria” cultivar was found to contain the highest level of C6 esters. C6 volatiles were grouped into three evolutionary patterns in these cultivars during berry development, and their evolution was consistent with the evolution of the LOX-HPL pathway genes’ expression. Pearson’s correlation analysis indicated that the LOX-HPL-pathway-related genes were correlated to the accumulation of C6 volatiles in these cultivars, and VvLOXA appeared to be an important gene that regulated the synthesis of all C6 volatiles. View Full-Text
Keywords: Vitis vinifera grapes; C6 volatiles; gas chromatography-mass spectrometry (GC-MS); VvLOXA expression; lipoxygenase-hydroperoxide lyase (LOX-HPL) pathway; multivariate analysis Vitis vinifera grapes; C6 volatiles; gas chromatography-mass spectrometry (GC-MS); VvLOXA expression; lipoxygenase-hydroperoxide lyase (LOX-HPL) pathway; multivariate analysis
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Qian, X.; Sun, L.; Xu, X.-Q.; Zhu, B.-Q.; Xu, H.-Y. Differential Expression of VvLOXA Diversifies C6 Volatile Profiles in Some Vitis vinifera Table Grape Cultivars. Int. J. Mol. Sci. 2017, 18, 2705.

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