Abstract
A new series of salicyl glycoconjugates containing hydrazide and hydrazone moieties were designed and synthesized. The bioassay indicated that the novel compounds had no in vitro fungicidal activity but showed significant in vivo antifungal activity against the tested fungal pathogens. Some compounds even had superior activity than the commercial fungicides in greenhouse trial. The results of RT-PCR analysis showed that the designed salicyl glycoconjugates could induce the expression of LOX1 and Cs-AOS2, which are the specific marker genes of jasmonate signaling pathway, to trigger the plant defense resistance.
Highlights
In the past two decades, the goal of sustainable and green agriculture had been inspiring researchers to explore the feasibility of restricting toxic agrochemical usage to reduce their impact on environment and food chains
We focused on the molecular design and synthesis of novel salicyl glycoconjugates as elicitors against plant diseases
We present here the preparation and characterization of the new elicitors based on salicylic acid and 5-phenyl-2-furan moiety (Figure 1), and show that these compounds could induce the systemic acquired resistance against pathogenic infections in cucumber
Summary
In the past two decades, the goal of sustainable and green agriculture had been inspiring researchers to explore the feasibility of restricting toxic agrochemical usage to reduce their impact on environment and food chains. Following plant-pathogen interaction, a number of plant defense responses could be induced (e.g., callus deposition, PR-protein accumulation, et al.) at the site of infection, and in uninfected tissues, activated by signal molecules associated with defense responses, which resulted in increased resistance to subsequent infections. The systemic acquired resistance is a ‘‘whole-plant’’ defense response that occurred following an earlier localized exposure to a pathogen. Activation of systemic acquired resistance required the accumulation of endogenous salicylic acid [3,4,5]. Besides the salicylic acid dependent defense signaling pathway, the others had been reported. Endogenous jasmonic acid and methyl jasmonate were the potent signaling molecules which could induce a large set of defense responses [6]. Systemic acquired resistance possessed low specificity, was not overcome by new pathogens which emerged frequently
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