TAILIEUCHUNG - Báo cáo khoa học: "Preliminary study of the monoterpene response of three pines to Ophiostoma clavigerum (Ascomycetes : Ophiostomatales) and two chemical elicitors"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài: "Preliminary study of the monoterpene response of three pines to Ophiostoma clavigerum (Ascomycetes : Ophiostomatales) and two chemical elicitors. | Ann Sá For 1991 48 377-388 Elsevier INRA 377 Original article Preliminary study of the monoterpene response of three pines to Ophiostoma clavlgerum Ascomycetes Ophiostomatales and two chemical elicitors F Lieutier 1 AA Berryman 2 JA Millstein 2 INRA Ardon 45160 Olivet France 2 Washington State University Department of Entomology Pullman WA 99164 USA Received 3 August 1990 accepted 15 March 1991 Summary The monoterpene response of phloem and sapwood of individual pines belonging to 3 species Pinus contorta Pinus ponderosa and Pinus monticola to inoculation with Ophiostoma cla-vigerum and injection with chitosan a proteinase inhibitor-inducing factor and a control buffer was investigated quantitatively and qualitatively. The total quantity of monoterpene in the reactive tissues increased with each treatment but to different levels. In each tree the monoterpene composition of the reactive tissues differed from that of the unwounded tissues but was the same whatever the treatment even in the case of an injection with buffer control. In addition phloem and sapwood responses were qualitatively identical although constitutive compositions differed greatly. The composition of reactive tissues was not very different from that of unwounded sapwood. The direction of variation of each monoterpene from unwounded to reactive tissues differed according to the particular tree. Only phellandrene limonene reacted consistently. From these results we cannot conclude that chitosan is a natural elicitor and the non-specificity of the response for the aggression favors the hypothesis that an elicitor originates from the tree itself. Because of this non-specificity and the fact that the three trees responded in a qualitatively different manner we suggest that the qualitative monoterpene response of the tree is not adapted to any specific aggressor even though these trees are usually hosts of the same bark beetle-fungus complex Thus the role of monoterpenes in the induced defensive .

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