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Authors: Yan-lun Ju, Bo-chen Liu, Xue-lei Xu, Jin-ren Wu, Wei Sun and Yu-lin Fang.
Scientia Horticulturae (2022)
Highlights • The effects of SL and MeJA on the quality of grapes were revealed. • GR24 and MeJA treatments promoted the ripening and coloration of grapes. • GR24+MeJA co-treatment increased the contents of UFAs in grapes. • GR24 and MeJA treatments increased volatile compounds contents. • The relationships between metabolites and gene expressions were revealed.
Abstract: "The aim of this work was to gain insight on the effects of exogenous strigolactone (SL) and methyl jasmonate (MeJA) on grape quality. ‘Cabernet Sauvignon’ grapes were used as materials. High-performance liquid chromatography (HPLC) and gas chromatography mass spectrometry (GC-MS) were used for targeted metabolomic analyzed. Real-time quantitative PCR (qRT-PCR) was used for the genes expressions measurement. As results, GR24 (SL analogue) and MeJA treatments, especially GR24+MeJA co-treatment, promoted the ripening and coloration of grapes and induced the accumulation of anthocyanins and the expression of anthocyanin-related genes including VvUFGT, VvCHS, VvC4H and VvF3’H. Both the GR24 or MeJA treatment alone or the GR24+MeJA co-treatment significantly increased the contents of total soluble sugar (TSS) and organic acids in grape berries, except for citric acid. GR24 and MeJA treatments, especially GR24+MeJA co-treatment, enhanced the accumulation of volatile compounds. Moreover, GR24+MeJA co-treatment significantly increased the contents of C6 volatiles, derived from fatty acids by inducing the expression of VvLOXA, VvLOXB, VvLOXC, VvLOXD, VvHPL1, and VvHPL2. Overall, SL and MeJA applications, especially GR24+MeJA co-treatment may be useful for the quality improvement of red wine grapes."
