Abstract
Chemical insecticides are widely used for pest control worldwide. However, the impact of insecticides on indirect plant defense is seldom reported. Here, using tea plants and the pesticide imidacloprid, effects of chemical insecticides on C6-green leaf volatiles (GLVs) anabolism and release were investigated first time. Compared with the non-treated control plants, the treatment of imidacloprid resulted in the lower release amount of key GLVs: (Z)-3-hexenal, n-hexenal, (Z)-3-hexene-1-ol and (Z)-3-Hexenyl acetate. The qPCR analysis revealed a slight higher transcript level of the CsLOX3 gene but a significantly lower transcript level of CsHPL gene. Our results suggest that imidacloprid treatment can have a negative effect on the emission of GLVs due to suppressing the critical GLVs synthesis-related gene, consequently affecting plant indirect defense.
Highlights
green leaf volatiles (GLVs) are formed by a two-step reaction catalyzed by lipoxygenase (LOX) and fatty acid 13-hydroperoxide lyase (13HPL), which use linolenic or linoleic acids as substrate
Experiments could be caused by several reasons: different growth and developmental status of the tea plants, error produced in the GLVs collection processes, and different ecosystems
By measuring the release amount of GLVs, effects of chemical insecticides on indirect plant defense was investigated in tea plants
Summary
Received: 31 May 2018 Accepted: 23 November 2018 Published: xx xx xxxx (Camellia sinensis). The impact of insecticides on indirect plant defense is seldom reported. Using tea plants and the pesticide imidacloprid, effects of chemical insecticides on C6-green leaf volatiles (GLVs) anabolism and release were investigated first time. Compared with the non-treated control plants, the treatment of imidacloprid resulted in the lower release amount of key GLVs: (Z)-3-hexenal, n-hexenal, (Z)-3-hexene-1-ol and (Z)-3-Hexenyl acetate. Green leaf volatiles (GLVs) including six-carbon (C6) aldehydes, alcohols, and their esters, are important components of plant indirect defenses[5,6,7]. GLVs are formed by a two-step reaction catalyzed by lipoxygenase (LOX) and fatty acid 13-hydroperoxide lyase (13HPL), which use linolenic or linoleic acids as substrate. The effects of chemical insecticide imidacloprid on the release and anabolism of C6 GLVs in tea plants were investigated
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