Oral secretions affect HIPVs induced by generalist (Mythimna loreyi) and specialist (Parnara guttata) herbivores in rice
Sobhy, Islam S. Miyake, Atsushi Shinya, Tomonori Galis, Ivan
Sobhy, Islam S.
Miyake, Atsushi
Shinya, Tomonori
Galis, Ivan
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2017-08-31
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Abstract
Plants synthesize variable mixtures of herbivore-induced plant volatiles (HIPVs) as part of their evolutionary conserved defense. To elucidate the impact of chewing herbivores with different level of adaptation on HIPV profiles in rice, we measured HIPVs released from rice seedlings challenged by either the generalist herbivore Mythimna loreyi (MYL) or the specialist Parnara guttata (PAG). Both herbivores markedly elicited the emission of HIPVs, mainly on the second and third days after attack compared to control plants. In addition, side-by-side HIPV comparisons using MYL and PAG caterpillars revealed that generalist feeding induced comparably more HIPVs relative to specialist, particularly on day two as highlighted by multivariate analysis (PLS-DA) of emitted HIPVs, and further confirmed in mimicked herbivory experiments. Here, mechanically wounded plants treated with water (WW) released more VOCs than untreated controls, and on top of this, oral secretions (OS) from both herbivores showed differential effects on volatile emissions from the wounded plants. Similar to actual herbivory, MYL OS promoted higher amounts of HIPVs relative to PAG OS, thus supporting disparate induction of rice indirect defenses in response to generalist and specialist herbivores, which could be due to the differential composition of their OS. (196 words).
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Sobhy, I. S., Miyake, A., Shinya, T., & Galis, I. (2017). Oral secretions affect HIPVs induced by generalist (Mythimna loreyi) and specialist (Parnara guttata) herbivores in rice. Journal of Chemical Ecology, 43(9), 929–943. https://doi.org/10.1007/s10886-017-0882-4
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Springer
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Journal of Chemical Ecology
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en
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0098-0331
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1573-1561
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We thank Yuko Hojo for valuable help with insect rearing and maintenance. I. S. Sobhy was supported by the Japan Society for the Promotion of Science (JSPS) postdoctoral fellowship for foreigner researcher P13379. I. S. Sobhy gratefully acknowledges the permission of Suez Canal University, Ismailia, Egypt to undertake his postdoctoral fellowship. This work was supported in part by Grants-in-Aid for Scientific Research No. 24570026.