37 ジャスモン酸により誘導される揮発成分放出へのエチレンの関与

概要

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Herbivore attacks induce leaves to emit a specific blend of volatiles. It is thought that accumulation of jasmonic acid (JA) is elicited in higher plants in response to herbivore attack, which leads to emit the volatiles to attract natural enemy of herbivores. We found that lima bean.leaves, in response to the infestation with herbivorous mites, not only accumulate JA but also emit ethylene. Ethylene is thought as one of the signaling mediators, as like as JA, for wound response in plants. Thus, we studied the synergistic effects of exogenous 1-aminocyclopropane-t-carboxylic acid (ACC: a precursor of ethylene) and JA on production of induced volatiles by excised lima bean leaves. Application of ACC alone to leaves induced trace amounts of volatiles. However, ACC positively affected three JA-induced volatiles, (E)-and (Z)-β-ocimene, and (Z)-3- hexenyl acetate, when lima bean leaves were treated with JA and ACC. The ethylene inhibitor, silver thiosulphate, inhibited the production of these compounds. The results suggest synergic effects of JA and ethylene on inducible volatile production by lima bean leaves. Furthermore, lima bean leaves treated with JA plus ACC became more attractive to predatory, mites, phytoseiulus persimilis, than those treated with JA alone. We therefore conclude that ethylene is involved in one of the signal mediators for indirect defense systems.
植物化学調節学会の論文
2001-10-09