Abstract
In this study, 3-methyl-1,2,4-triazolyl chitosan (MTACS) and 3-chloromethyl-1,2,4-triazolyl chitosan (CMTACS) were prepared via cyclization of acyl thiourea chitosan (TUCS). Their structures were confirmed by FT-IR, 1H-NMR, elemental analysis, DSC, XRD, and SEM. The conformations were predicted using the Gaussian 09 program. Additionally, the antifungal properties of MTACS and CMTACS against Stemphylium solani weber (S. solani), Alternaria porri (A. porri), and Gloeosporium theae-sinensis (G. theae-sinensis) were assayed in vitro and ranged from 250 μg/mL to 1000 μg/mL. The results showed that MTACS and CMTACS exhibited enhanced inhibitory effect on the selected fungi compared to the original chitosan and TUCS. In particular, they displayed better antifungal activities against A. porri and G. theae-sinensis than that of the positive control, Triadimefon. The findings described here may lead to them being used as antifungal agents for crop protection.
Highlights
Plant-pathogenic fungi can lead to a decrease in crop yield and quality, resulting in huge economic losses every year worldwide [1]
The acyl thiourea chitosan derivatives (TUCS) we reported before were expected to be cyclized into corresponding 1,2,4-triazolyl chitosan (TACS) derivatives
Acyl thiourea chitosan (TUCS), by refluxing with hydrazine hydrate under a catalyzed amount of acetic anhydride, were cyclized into corresponding 1,2,4-triazolyl chitosan (TACS) derivatives
Summary
Plant-pathogenic fungi can lead to a decrease in crop yield and quality, resulting in huge economic losses every year worldwide [1]. Onion purple blotch disease, which is caused by A. porri, can bring about serious yield losses through loss of leaf tissue and a subsequent reduction in the rate of bulb development [2]. S. solany, the causal pathogen for grey leaf spot in tomatoes and leaf blight in alliums and cotton, can cause significant damage [3]. It has been shown to be a significant cause of disease in Chinese garlic crops [4]. Anthracnose caused by G. theae-sinensis is one of the most severe diseases that can affect the growth of leaves and cause serious yield losses of tea [5]. Synthetic fungicides have been used as the main approach to controlling plant-pathogenic fungi
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
