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Mol Ecol

Title:		"Temperature-dependent, behavioural, and transcriptional variability of a tritrophic interaction consisting of bean, herbivorous mite, and predator"
Author(s):		Ozawa R; Nishimura O; Yazawa S; Muroi A; Takabayashi J; Arimura G;
Address:		"Center for Ecological Research, Kyoto University, Otsu 520-2113, Japan"
Journal Title:		Mol Ecol
Year:		2012
Volume:		20121008
Issue:		22
Page Number:		5624 - 5635
DOI:		10.1111/mec.12052
ISSN/ISBN:		1365-294X (Electronic) 0962-1083 (Linking)
Abstract:		"Different organisms compensate for, and adapt to, environmental changes in different ways. In this way, environmental changes affect animal-plant interactions. In this study, we assessed the effect of temperature on a tritrophic system of the lima bean, the herbivorous spider mite Tetranychus urticae and the predatory mite Phytoseiulus persimilis. In this system, the plant defends itself against T. urticae by emitting volatiles that attract P. persimilis. Over 20-40 degrees C, the emission of volatiles by infested plants and the subsequent attraction of P. persimilis peaked at 30 degrees C, but the number of eggs laid by T. urticae adults and the number of eggs consumed by P. persimilis peaked at 35 degrees C. This indicates that the spider mites and predatory mites performed best at a higher temperature than that at which most volatile attractants were produced. Our data from transcriptome pyrosequencing of the mites found that P. persimilis up-regulated gene families for heat shock proteins (HSPs) and ubiquitin-associated proteins, whereas T. urticae did not. RNA interference-mediated gene suppression in P. persimilis revealed differences in temperature responses. Predation on T. urticae eggs by P. persimilis that had been fed PpHsp70-1 dsRNA was low at 35 degrees C but not at 25 degrees C when PpHsp70-1 expression was very high. Overall, our molecular and behavioural approaches revealed that the mode and tolerance of lima bean, T. urticae and P. persimilis are distinctly affected by temperature variability, thereby making their tritrophic interactions temperature dependent"
Keywords:		Animals Female Herbivory Mites/genetics/physiology Oviposition Ovum Phaseolus/*metabolism Pheromones/biosynthesis Predatory Behavior/*physiology RNA Interference *Temperature Tetranychidae/genetics/*physiology Transcriptome Volatile Organic Compounds/meta;
Notes:		"MedlineOzawa, Rika Nishimura, Osamu Yazawa, Shigenobu Muroi, Atsushi Takabayashi, Junji Arimura, Gen-ichiro eng Research Support, Non-U.S. Gov't England 2012/10/10 Mol Ecol. 2012 Nov; 21(22):5624-35. doi: 10.1111/mec.12052. Epub 2012 Oct 8"