| Title: | Characterization of Transcriptional Expression and Regulation of Carotenoid Cleavage Dioxygenase 4b in Grapes |
| Author(s): | Meng N; Wei Y; Gao Y; Yu K; Cheng J; Li XY; Duan CQ; Pan QH; |
| Address: | "Center for Viticulture and Enology, College of Food Science and Nutritional Engineering, China Agricultural University, Beijing, China. Key Laboratory of Viticulture and Enology, Ministry of Agricultural and Rural Affairs, Beijing, China" |
| ISSN/ISBN: | 1664-462X (Print) 1664-462X (Electronic) 1664-462X (Linking) |
| Abstract: | "Norisoprenoids are important aromatic volatiles contributing to the pleasant floral/fruity odor in grapes and wine. They are produced from carotenoids through the cleavage of carotenoid cleavage dioxygenases (CCDs). However, the underlying mechanisms regulating VvCCD expression remain poorly understood. In this study, we showed that VvCCD4b expression was positively correlated with the accumulation of beta-damascenone, beta-ionone, 6-methyl-5-hepten-2-one, geranylacetone, dihydroedulan I, and total norisoprenoids in developing grapes in two vintages from two regions. VvCCD4b was found to be principally expressed in flowers, mature leaves, and berries. Abscisic acid strongly induced the expression of this gene. Additionally, the present study preliminarily indicated that the activity of the VvCCD4b promoter was dropped under 37 degrees C treatment and also responded to the illumination change. VvCCD4b was expressed in parallel with VvMADS4 in developing grape berries. The latter is a MADS family transcription factor and nucleus-localized protein that was captured by yeast one-hybrid. A dual-luciferase reporter assay in tobacco leaves revealed that VvMADS4 downregulated the activity of the VvCCD4b promoter. VvMADS4 overexpression in grape calli and Vitis quinquangularis Rehd. leaves repressed the VvCCD4b expression. In summary, this work demonstrates that VvCCD4b expression is positively correlated with the accumulation of norisoprenoids, and VvMADS4 is a potential negative regulator of VvCCD4b. Our results provide a new perspective for understanding the regulation of VvCCD4b expression and norisoprenoid accumulation in grapes" |
| Keywords: | Vitis vinifera L.VvMADS4 carotenoid cleavage dioxygenase 4b expression and regulation norisoprenoids; |
| Notes: | "PubMed-not-MEDLINEMeng, Nan Wei, Yi Gao, Yuan Yu, Keji Cheng, Jing Li, Xiang-Yi Duan, Chang-Qing Pan, Qiu-Hong eng Switzerland 2020/05/28 Front Plant Sci. 2020 May 8; 11:483. doi: 10.3389/fpls.2020.00483. eCollection 2020" |
