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Dose-dependent effects of exogenous melatonin on the plant response to biotic and abiotic stresses.

Faoro;
2007
2007
VIROLOGIA VEGETALE
melatonin
biotic stress
abiotic stress
TNV
plant defence
DOSE-DEPENDENT EFFECTS OF EXOGENOUS MELATONIN ON THE PLANT RESPONSE TO BIOTIC AND ABIOTIC STRESSES. M. Iriti and F. Faoro. Istituto di Patologia Vegetale, Università di Milano and Istituto di Virologia Vegetale, CNR, via Celoria 2, 20133, Milano, Italy. E-mail: [email protected] Melatonin has been supposed to be an animal hormone, until its recent discovery in plant. It occurs in many species of angiosperms, where it regulates circadian rhythms, photoperiodic reactions, growth, cell oxidative homeostasis and its synthesis responds to priming with plant activators. In this work, different concentrations of exogenous melatonin have been assayed in order to investigate its role in plant response to stresses. In tobacco, melatonin concentrations ranging from 1 to 10 mM, with a 24h induction time, increased the number of TNV foliar lesions up to 28% vs. untreated inoculated plants, whereas melatonin concentrations lower than 0.5 mM had not any effect on the infection spreading. Furthermore, 15 mM ascorbic acid (AA) greatly enhanced the TNV infection, 10-50 mM H2O2 significantly reduced the number and size of lesions, whereas both AA and 0.5 mM melatonin, 1h before treatment with the plant activator benzothiadiazole, reduced its efficacy against TNV. In beans and currant tomatoes exposed for 45’ to UVC, pretreatment with a low melatonin concentration, 250 ¼M and 1mM respectively, worsened the radiation injury, improving the numbers of dead cells vs. the untreated irradiate
info:eu-repo/semantics/article
266
none
01 Contributo su Rivista::01.05 Abstract in rivista
Iriti, M; Faoro, Franco; F,
3
01.05 Abstract in rivista
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.14243/96546
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