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Foliar Spraying with ZnSO4 or ZnO of Vitis vinifera cv. Syrah Increases the Synthesis of Photoassimilates and Favors Winemaking
Publication . Daccak, Diana; Marques, Ana Coelho; Pessoa, Cláudia Campos; Coelho, Ana Rita F.; Luís, Inês Carmo; Brito, Graça; Kullberg, José Carlos; Ramalho, José C.; Rodrigues, Ana Paula; Scotti-Campos, Paula; Pais, Isabel P.; Semedo, José N.; Silva, Maria Manuela; Legoinha, Paulo; Galhano, Carlos; Simões, Manuela; Reboredo, Fernando H.; Lidon, Fernando C.
Zinc enrichment of edible food products, through the soil and/or foliar application of
fertilizers, is a strategy that can increase the contents of some nutrients, namely Zn. In this context, a
workflow for agronomic enrichment with zinc was carried out on irrigated Vitis vinifera cv. Syrah,
aiming to evaluate the mobilization of photoassimilates to the winegrapes and the consequences of
this for winemaking. During three productive cycles, foliar applications were performed with ZnSO4
or ZnO, at concentrations ranging between 150 and 1350 g.ha−1. The normal vegetation index as
well as some photosynthetic parameters indicated that the threshold of Zn toxicity was not reached;
it is even worth noting that with ZnSO4, a significant increase in several cases was observed in net
photosynthesis (Pn). At harvest, Zn biofortification reached a 1.2 to 2.3-fold increase with ZnSO4 and
ZnO, respectively (being significant relative to the control, in two consecutive years, with ZnO at a
concentration of 1350 g.ha−1). Total soluble sugars revealed higher values with grapes submitted to
ZnSO4 and ZnO foliar applications, which can be advantageous for winemaking. It was concluded
that foliar spraying was efficient with ZnO and ZnSO4, showing potential benefits for wine quality
without evidencing negative impacts.
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Fundação para a Ciência e a Tecnologia
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2023.01847.BDANA