Abstract
One of the main abiotic stresses that strongly affects plant survival and the primary cause of crop loss around the world is drought. Drought stress leads to sequential morphological, physiological, biochemical and molecular changes that can have severe effects on plant growth, development and productivity. As a consequence of these changes, the interaction between plants and insects can be altered. Using cultivated Brassica oleracea plants, the parasitoid Microplitis mediator and its herbivorous host Mamestra brassicae, we studied the effect of drought stress on (1) the emission of plant volatile organic compounds (VOCs), (2) plant hormone titres, (3) preference and performance of the herbivore, and (4) preference of the parasitoid. Higher levels of jasmonic acid (JA) and abscisic acid (ABA) were recorded in response to herbivory, but no significant differences were observed for salicylic acid (SA) and indole-3-acetic acid (IAA). Drought significantly impacted SA level and showed a significant interactive effect with herbivory for IAA levels. A total of 55 VOCs were recorded and the difference among the treatments was influenced largely by herbivory, where the emission rate of fatty acid-derived volatiles, nitriles and (E)-4,8-dimethylnona-1,3,7-triene [(E)-DMNT] was enhanced. Mamestra brassicae moths preferred to lay eggs on drought-stressed over control plants; their offspring performed similarly on plants of both treatments. VOCs due to drought did not affect the choice of M. mediator parasitoids. Overall, our study reveals an influence of drought on plant chemistry and insect-plant interactions.
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04 May 2018
One of the main abiotic stresses that strongly affects plant survival and the primary cause of crop loss around the world is drought.
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Acknowledgments
We thank Joop van Loon for his advice during the execution of the experiment. We are grateful for the guidance and support of Francel Verstappen and Tatsiana Charnikhova of the Laboratory of Plant Physiology, Wageningen University during the phytohormone analyses. We thank Léon Westerd, Frans van Aggelen and André Gidding for rearing the insects and Unifarm of Wageningen University for supplying plants. This work was supported by the Earth and Life Sciences Council of the Netherlands Organisation for Scientific Research (NWO-ALW) through grant 844.10.005 and the Spinoza award to M.D.
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Communicated by Richard Karban.
B. T. Weldegergis and F. Zhu made equal contributions to the article.
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Weldegergis, B.T., Zhu, F., Poelman, E.H. et al. Drought stress affects plant metabolites and herbivore preference but not host location by its parasitoids. Oecologia 177, 701–713 (2015). https://doi.org/10.1007/s00442-014-3129-x
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DOI: https://doi.org/10.1007/s00442-014-3129-x