Abstract
Despite the numerous beneficial properties and uses of chitosan in agriculture, the molecular mechanisms behind its elicitation potential are still unclear. This study aimed at understanding the effect of chitosan application in the levels of phenolic compounds of Vitis vinifera L. red grapes berry skin (cv. Tinto Cão) during veraison. Grapevines were treated with chitosan (0.01% in 0.01% acetic acid) while control grapevines were sprayed with 0.01% acetic acid. Results showed that several monomeric anthocyanins increased significantly in berry skins after treatment with chitosan. Additionally, Catechin, Rutin and Querecetin-3-O-galactoside were also recorded in higher amount upon chitosan treatment. Besides modulating the phenolic content, chitosan treatment also induced modifications in several target genes encoding key enzymes and transporters involved in secondary metabolic pathways. For instance, the genes PAL, CHS, F3H, ANR, UFGT, ABCC1, GST, MATE1 were upregulated in leaves and berry skins at veraison cessation in response to chitosan treatment. Overall, the results demonstrated that chitosan has a stimulatory effect on the accumulation of phenolic compounds, including anthocyanins, mediated by modifications in the transcription of key genes involved in their biosynthesis and transport in grape berries.
Highlights
IntroductionChitosan has become one of the most popular biopolymer and leading elicitor molecule for plants since the last decade [1,2]
Owing to multifarious properties, chitosan has become one of the most popular biopolymer and leading elicitor molecule for plants since the last decade [1,2]
The raw material for chitosan production is abundant in nature, and is second only to cellulose in terms of the availability
Summary
Chitosan has become one of the most popular biopolymer and leading elicitor molecule for plants since the last decade [1,2]. It is produced by alkaline deacetylation of chitin obtained from insects, exoskeleton of crustaceans, and fungal cell walls [3]. Chitosan application is economically feasible for various applications in agriculture [1]. This work was considered as a pioneer study and opened new frontiers for the application of fungal cell wall derivatives, such as chitosan, to achieve desired results in agriculture
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