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Abstract
We investigated the effects of prohydrojasmon (PDJ) [propyl (1RS,2RS)-(3-oxo-2-pentylcyclopentyl) acetate] treatment of intact lima bean plants on direct defense against two-spotted spider mites (TSSMs), Tetranychus urticae, and on the production of plant volatiles. Plants were treated with PDJ or water (control) and pieces cut from their leaves were exposed to mated TSSM females. After 3 days, there were no significant differences in TSSM mortality between the treatments, but the females laid significantly fewer eggs on treated disks. Headspace analyses of plants treated with one of three different concentrations of PDJ showed that the treatment induced (Z)-3-hexenyl acetate, (E)-β-ocimene, (Z)-β-ocimene, (E)-4,8-dimethyl-1,3,7-nonatriene, and β-caryophyllene. These compounds were expected to affect the behavioral responses of TSSMs and their natural enemies.
Acknowledgements
We thank M.W. Sabelis for comments on statistical analysis. This research was partly supported by a Grant-in-Aid for Scientific Research (S) (No. 19101009) from the Global Centre of Excellence Program ‘Formation of a Strategic Base for Biodiversity and Evolutionary Research: from Genome to Ecosystem’ of Kyoto University, and by the Japan Society for the Promotion of Science (JSPS): Core-to-Core project ‘Studies on ecological interaction networks that promote biodiversity — From gene to ecosystem.’
