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A comparison of the effects of a fungal elicitor and ultraviolet radiation on ion transport and hydrogen peroxide synthesis by rose cells

1991; Elsevier BV; Volume: 31; Issue: 2 Linguagem: Inglês

10.1016/0098-8472(91)90072-v

1873-7307

Tyron Arnott, Terence M. Murphy,

Plant and Biological Electrophysiology Studies

An elicitor preparation from a Phytophthora sp. induced an efflux of K+ and a production of H2O2 by cell suspensions of Rosa damascena. The kinetics and amounts of K+ efflux and of H2O2 production and degradation were similar to those observed when the cells were treated with u.v. radiation (254 nm). The K+ efflux from both elicitor-treated and u.v.-treated rose cells was inhibited at 0 °K+ efflux from elicitor-treated cells was stimulated by a pretreatment of the cells at 40°C; efflux from u.v.-treated cells was inhibited by the same pretreatment. Washed cells lost sensitivity to elicitor (but not u.v.) over a period of several hours. Like u.v.-treated cells, elicitor-treated cells lost sensitivity to a second treatment with u.v. given 15–18 hr later. The results are interpreted in terms of a common ion transport process stimulated by elicitor and u.v. through different receptors.