Title: The diurnal emission pattern of constitutive and induced rice volatiles
Authors: Sobhy, Islam
Miyake, Atsushi
Galis, Ivan #
Issue Date: 30-Jun-2015
Conference: 31st conference of the International Society of Chemical Ecology (ISCE) location:Stockholm Universiy, Stockholm, Sweden date:29 June - 3 July 2015
Abstract: Plants have evolved highly effective defense mechanisms to resist attacks by herbivores. Insect resistance traits include 'indirect defense' which is the ability to respond to herbivore attack by synthesizing a complex bouquet of herbivore-induced volatile organic compounds (HI-VOCs) that attract natural enemies of herbivores. Using the trophic model of rice plant and the generalist Loreyi armyworm, Mythimna loreyi Duponchel (MYL), we characterized the inducibility of rice HI-VOCs upon MYL mimicked herbivory. Our results show that simulated MYL feeding significantly increases the emission of a number of key HI-VOCs, including linalool and MeSA. Given that many abiotic factors affect VOCs emissions, such as the photoperiod (Gouinguené and Turlings 2002), the diurnal emission patterns of HI-VOCs were determined in control rice plants and those subjected to MYL simulated feeding on a previous day. Our findings stress that both control and induced rice plants followed a diurnal pattern in VOCs emission; however, induced plants emitted remarkably higher amounts of HI-VOCs, 2-10 folds in some compounds, compared with control plants. It suggests that such enhanced HI-VOCs blend and its composition fully depends on the photoperiod of the environment when the natural enemies are actively foraging during the day.
Publication status: published
KU Leuven publication type: IMa
Appears in Collections:Non-KU Leuven Association publications
# (joint) last author

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