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PLANT PHYSIOLOGY , Vol 111, Issue 3 755-763, Copyright © 1996 by American Society of Plant Biologists
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PLANT-MICROBE AND PLANT-INSECT INTERACTIONS |
Influence of Salicylic Acid on the Induction of Competence for H2O2 Elicitation (Comparison of Ergosterol with Other Elicitors)
H. Kauss and W. Jeblick
Fachbereich Biologie der Universitat, Postfach 3049, D-67653 Kaiserslautern, Germany
Hypocotyls from etiolated cucumber (Cucumis sativus L.) seedlings were
gently abraded at their epidermal surface, and cut segments were used to
study the rapid and transient elicitation of H2O2 by ergosterol, chitosan,
mastoparan, and a polymeric fungal elicitor. Freshly abraded segments were
only barely competent for any H2O2 production, but they developed this
competence subsequent to abrasion. This process was enhanced by
2,6-dichloroisonicotinic acid and salicylic acid, which induced acquired
resistance to fungal penetration in the epidermal cells. Enhancement of
competence induction by salicylic acid was also evident for spontaneous
H2O2 production and differed in degree for the various elicitors,
indicating that mainly the enzyme complex producing H2O2, but also other
components of the elicitation system, improved. Ergosterol, chitosan, and
fungal elicitor also rendered the segments refractory to a second
stimulation by the same compound, whereas mastoparan was inactive in this
respect. The four elicitors also differed markedly in their ability to
diminish or enhance H2O2 production by a second treatment with a different
elicitor, indicating that several sites of the H2O2 elicitation system are
subject to short-term regulation.
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