%0 Journal Article
%9 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES
%A Chen, J.
%A Fernandez, Diana
%A Wang, D. D.
%A Chen, Y. J.
%A Dai, G. H.
%T Biological control mechanisms of D-pinitol against powdery mildew in cucumber
%D 2014
%L fdi:010063125
%G ENG
%J Physiological and Molecular Plant Pathology
%@ 0885-5765
%K Podosphaera xanthii ; Plant defense responses ; D-pinitol ; Cucumber
%M ISI:000345697900008
%P 52-60
%R 10.1016/j.pmpp.2014.09.001
%U https://www.documentation.ird.fr/hor/fdi:010063125
%> https://www.documentation.ird.fr/intranet/publi/2015/01/010063125.pdf
%V 88
%W Horizon (IRD)
%X D-pinitol is an effective agent for controlling powdery mildew (Podosphaera xanthii) in cucumber. In this study, we determined the mechanisms of D-pinitol in controlling powdery mildew in cucumber plants. We compared P. xanthii development on cucumber leaf surface treated with D-pinitol or water (2 mg ml(-1)) at different time points after inoculation. The germinating conidia, hyphae, and conidiophores of the pathogen were severely damaged by D-pinitol at any time of application tested. The highest level of suppression of fungal development was obtained at 3 days after inoculation. The contents of chlorophyll, total phenolics, flavonoid, and gallic acid and its derivatives (GAD); the activities of phenylalanine ammonialyase (PAL), polyphenoloxidase (PPO), peroxidase (POX), and superoxide dismutase (SOD); and the expression of the genes encoding for PR-1, peroxidase (POX), lipoxygenase (LOX1), chitinase (Chit1) were higher in the cucumber leaves treated with D-pinitol and inoculated than in the leaves either treated with D-pinitol or inoculated with the pathogen. These results suggest that D-pinitol triggers several plant defense responses in cucumber leading to pathogen suppression and resistance to powdery mildew.
%$ 076