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PLANT PHYSIOLOGY , Vol 111, Issue 3 885-891, Copyright © 1996 by American Society of Plant Biologists

PLANT-MICROBE AND PLANT-INSECT INTERACTIONS

Relationship between Active Oxygen Species, Lipid Peroxidation, Necrosis, and Phytoalexin Production Induced by Elicitins in Nicotiana

C. Rusterucci, V. Stallaert, M. L. Milat, A. Pugin, P. Ricci and J. P. Blein
Unite Associee Institut National de la Recherche Agronomique (INRA)-Universite de Bourgogne no. 692, Laboratoire de Phytopharmacie et Biochimie des Interactions Cellulaires, BV 1540, Dijon Cedex 21034, France (C.R., V.S., M.-L.M., A.P., J.-P.B.)

Excised leaves of Nicotiana tabacum var Xanthi and Nicotiana rustica were treated with cryptogein and capsicein, basic and acidic elicitins, respectively. Both compounds induced leaf necrosis, the intensity of which depended on concentration and duration of treatment. N. tabacum var Xanthi was the most sensitive species and cryptogein was the most active elicitin. Lipid peroxidation in elicitin-treated Nicotiana leaves was closely correlated with the appearance of necrosis. Elicitin treatments induced a rapid and transient burst of active oxygen species (AOS) in cell cultures of both Nicotiana species, with the production by Xanthi cells being 6-fold greater than that by N. rustica. Similar maximum AOS production levels were observed with both elicitins, but capsicein required 10-fold higher concentrations than those of cryptogein. Phytoalexin production was lower in response to both elicitins in N. tabacum var Xanthi cells than in N. rustica cells, and capsicein was the most efficient elicitor of this response. In cryptogein-treated cell suspensions, phytoalexin synthesis was unaffected by diphenyleneiodonium, which inhibited AOS generation, nor was it affected by tiron or catalase, which suppressed AOS accumulation in the extracellular medium. These results suggest that AOS production, lipid peroxidation, and necrosis are directly related, whereas phytoalexin production depends on neither the presence nor the intensity of these responses.


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