期刊
JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE
卷 102, 期 2, 页码 782-793出版社
WILEY
DOI: 10.1002/jsfa.11413
关键词
abscisic acid; antioxidants; berry ripening; indole-3-acetic acid; redox homeostasis; salicylic acid
资金
- National Funds by FCT-Portuguese Foundation for Science and Technology [UIDB/04033/2020]
- EU [810176]
- project I&DI AgriFood XXI [NORTE-01-0145-FEDER-000041]
- European Regional Development Fund (FEDER) through NORTE 2020 (Programa Operacional Regional do Norte 2014/2020)
- FCT-Portuguese Foundation for Science and Technology [PD/BD/128273/2017]
- FCT
- UTAD [57/2017]
- Fundação para a Ciência e a Tecnologia [PD/BD/128273/2017] Funding Source: FCT
The application of kaolin particle film in grapevines was studied in two growing seasons to evaluate its effects on phytohormones, antioxidant defense, and oenological parameters. Results showed that kaolin delayed ripening processes under severe summer stress conditions and improved antioxidant defense and phytohormone balance in treated berries, with significant interactions observed between kaolin treatment, variety, and developmental stage in both assessed years.
BACKGROUND The application of kaolin particle film is considered a short-term strategy against several environmental stresses in areas with a Mediterranean-like climate. However, it is known that temperature fluctuations and water availability over the season can jeopardize kaolin efficiency in many Mediterranean crops. Hence, this study aims to evaluate the effects of kaolin foliar application on berry phytohormones, antioxidant defence, and oenological parameters at veraison and harvest stages of Touriga-Franca (TF) and Touriga-Nacional (TN) grapevines in two growing seasons (2017 and 2018). The 2017 growing season was considered the driest (-147.1 dryness index) and the warmest (2705 degrees C growing degree days) of the study. RESULTS In 2017, TF kaolin-treated berries showed lower salicylic acid (-26.6% compared with unsprayed vines) and abscisic acid (ABA) (-10.5%) accumulation at veraison, whereas salicylic acid increased up to 28.8% at harvest. In a less hot season, TN and TF kaolin-treated grapevines showed a twofold in ABA content and a threefold increase in the indole-3-acetic acid content at veraison and lower ABA levels (83.8%) compared with unsprayed vines at harvest. Treated berries showed a decreased sugar content, without compromising malic and tartaric acid levels, and reactive oxygen species accumulation throughout berry ripening. CONCLUSION The results suggest kaolin exerts a delaying effect in triggering ripening-related processes under severe summer stress conditions. Treated berries responded with improved antioxidant defence and phytohormone balance, showing significant interactions between kaolin treatment, variety, and developmental stage in both assessed years. (c) 2021 Society of Chemical Industry.
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