Journal
BIOSCIENCE BIOTECHNOLOGY AND BIOCHEMISTRY
Volume 82, Issue 3, Pages 395-406Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/09168451.2018.1433019
Keywords
Oenothera biennis; plant-insect interactions; methyl jasmonate; prey location; Zicrona caerulea
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Funding
- JSPS KAKENHI from Japan Society for the Promotion of Science (JSPS) [JP24780114]
- President-Sponsored Research Projects of Akita Prefectural University
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Herbivore-induced plant volatiles play important roles in plant-insect and plant-plant interactions. The common evening primrose, Oenothera biennis, is often infested by the flea beetle, Altica oleracea, on which the predatory blue shield bug, Zicrona caerulea, is usually found. This observation suggests that the predatory bug can discriminate infested plants from intact ones to locate its prey. In this study, l-leucine-derived nitrogen-containing compounds [isovaleronitrile (3-methylbutanenitrile), (E/Z)-isovaleraldoxime and 3-methyl-1-nitrobutane] and some terpenes were identified as a characteristic volatile blend from herbivore-infested O. biennis leaves by gas chromatography/mass spectrometry, chemical synthesis, and incorporation assays using deuterium-labeled l-leucine. Volatile emission was also elicited by exogenous methyl jasmonate (MeJA), but not by mechanical damage. l-Leucine accumulated temporarily in O. biennis leaves after MeJA treatment prior to isovaleronitrile emission. Behavioral assays revealed that Z. caerulea showed a strong preference for herbivore-infested leaves, their volatiles, and isovaleronitrile in laboratory conditions.
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