Abstract
Hormone treatment enhanced the content of osmotic substances under high-temperature conditions. The effect of ABA and BR treated separately is better than treated together. To determine the effect of abscisic acid (ABA), brassinolide (BR) and ABA + BR on grape quality under high-temperature stress, various metabolites were analyzed. Compared with the control (CK), DL-tryptophan, D-raffinose, geniposidic acid, dodecanedioic acid and polyphenols were found to be higher after ABA treatment. After BR treatment, amino acids and poricoic acid B were higher than in CK. And carbohydrates and amino acids were up-regulated after ABA + BR treatment. BR and ABA + BR treatment also induced higher endogenous ABA and epibrassinolide contents. In addition, treated grape had higher soluble solid concentrations and soluble sugar content, and delayed the degradation of middle lamella and microfibrils. Antioxidant and heat shock-related genes were examined, which significantly increased in treated grape. The finding of this study suggested that ABA, BR and ABA + BR are very useful for alleviating high-temperature damage by increasing the accumulation of osmotic adjustment substances, and endogenous hormones content.
Highlights
Grape (Vitis vinifera L.) is one of the most popular horticultural crops in the world
The time of significant increase was at 24 h in Abscisic acid (ABA) treatment, 36 h in ABA + BR treatment and 48 h in BR treatment, respectively (Fig. 1b–d). These results suggested that exogenous ABA, BR and ABA + BR treatment could enhance the accumulation of soluble sugar content under high temperature (HT) and the promotion effect of ABA treatment was earlier than others
The finding of the present study suggested that ABA, BR and ABA + BR have a good impact on maintaining grape fruit quality under HTS
Summary
Grape (Vitis vinifera L.) is one of the most popular horticultural crops in the world. Nowadays, it become more and more popular among people for its higher nutrient value, abundant vitamins, minerals, and a variety of amino acids needed by the human body. With the deepening of research, ABA has been found to play an important role in plant drought, high salt, heat and other stress (Dar et al 2017; Islam et al 2018). Kurepin et al (2008) performed short-term high stress and BR treatments on canola seedlings, and the results showed that the enhancement of tolerance to HTS may be caused by endogenous ABA concentration. The effect of BR and ABA + BR on postharvest grape under HTS is rarely reported
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