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PLANT PHYSIOLOGY , Vol 109, Issue 4 1227-1230, Copyright © 1995 by American Society of Plant Biologists

WHOLE PLANT, ENVIRONMENTAL, AND STRESS PHYSIOLOGY

Effect of Volatile Methyl Jasmonate on the Oxylipin Pathway in Tobacco, Cucumber, and Arabidopsis

S. Avdiushko, KPC. Croft, G. C. Brown, D. M. Jackson, T. R. Hamilton-Kemp and D. Hildebrand
Departments of Agronomy (S.A., K.P.C.C., D.H.), Entomology (G.C.B.), and Horticulture (T.R.H.-K.), University of Kentucky, Lexington, Kentucky 40546

The effect of atmospheric methyl jasmonate on the oxylipin pathway was investigated in leaves of tobacco (Nicotiana tabacum L.), cucumber (Cucumis sativa L.), and Arabidopsis thaliana (L.). Differential sensitivities of test plants to methyl jasmonate were observed. Thus, different concentrations of methyl jasmonate were required for induction of changes in the oxylipin pathway. Arabidopsis was the least and cucumber the most sensitive to methyl jasmonate. Methyl jasmonate induced the accumulation of lipoxygenase protein and a corresponding increase in extractable lipoxygenase activity. Atmospheric methyl jasmonate additionally induced hydroperoxide lyase activity and the enhanced production of several volatile six-carbon products. It is interesting that lipid hydroperoxidase activity, which is a measure of hydroperoxide lyase plus allene oxide synthase plus possibly other lipid hydroperoxide-metabolizing activities, was not changed by methyl jasmonate treatment. Methyl jasmonate selectively altered the activity of certain enzymes of the oxylipin pathway (lipoxygenase and hydroperoxide lyase) and increased the potential of leaves for greatly enhanced six-carbon-volatile production.


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