Abstract
Phenylacetonitrile, (E)-β-ocimene, linalool, (E)-4,8-dimethyl-1,3,7-nonatriene and (E,E)-α-farnesene were identified as Japanese beetle, Popillia japonica, feeding-induced volatiles from the leaves of the giant knotweed, Fallopia sachalinensis, but not by mechanical damage. Volatile emission was also induced by treatment with a cellular signaling molecule, methyl jasmonate. These results suggest that volatiles will be synthesized de novo by a biotic elicitor from P. japonica oral secretion.
Highlights
Plants emit a series of characteristic volatile blends, such as terpenes and green leaf volatiles, when they are damaged by insect feeding
The volatiles induced by P. japonica feeding were analyzed by GC–MS and the volatile components were identified as phenylacetonitrile, (E)-β-ocimene, linalool, DMNT and (E,E)-α-farnesene, as shown in Figure 1 and Table 1
Volatile emission was not observed from either undamaged leaves or mechanically damaged leaves. These results suggest that volatile emission will be induced by a herbivore-specific factor, an elicitor present in the oral secretion of P. japonica
Summary
Plants emit a series of characteristic volatile blends, such as terpenes and green leaf volatiles, when they are damaged by insect feeding. The Japanese beetle, Popillia japonica (Coleoptera: Scarabaeidae), is known to be a destructive pest in North America that damages leaves, flowers or fruits of more than 300 plant species [13]. Both female and male beetles are attracted by floral or fruit-like odors, such as geraniol, eugenol and phenethyl propionate, which enhance the attraction of males when treated with a sex pheromone, japonilure [14,15]. F. sachalinensis is induced by treatment with exogenous airborne MeJA
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