tailieunhanh - Báo cáo khoa học: "Abietane and pimarane diterpene acid evolution in Scots pine Pinus sylvestris needles in relation to feeding of the pine sawfly, Diprion pini L."

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài: "Abietane and pimarane diterpene acid evolution in Scots pine Pinus sylvestris needles in relation to feeding of the pine sawfly, Diprion pini L. | 161 Ann Sci For 1990 47 161-171 Elsevier INRA Original article Abietane and pimarane diterpene acid evolution in Scots pine Pinus sylvestris needles in relation to feeding of the pine sawfly Diprion pint L. l_ Buratti 1 JP Allais 1 c Geri 2 M Barbier1 1 Institut de Chimie des Substances Naturelles - CNRS 91198 Gif-sur-Yvette Cedex 2 Station de Zoologie Porestière - INRA Ardon 45160 Olivet France Received 16 February 1989 accepted 30 June 1989 Summary - Abietane and pimarane resin acids extracted from the needles of Scots pine Pinus sylvestris were analysed by reverse phase HPLC followed by GC of their methyl esters in relation to the seasons or the age of the trees p sylvestris is the habitual host plant of the sawfly Diprion pin Hymenoptera Diprionidae and results of the analyses were correlated with the feeding pattern of this insect in nature. An increase in resin acid concentration was observed during the growing season but no direct relationship could be established with the feeding preferences of these insects. Young pines contained lower levels of abietane and pimarane diterpene acids than 10 or 30 year-old pines. Previous defoliation induced an increase in the neutral fraction and although less so in the diterpene acids in the needles formed the following year. The observed results are discussed in relation to the development of Diprion pini larvae and to previous hypotheses from other authors concerning the antifeedant properties of the resin acids. It is concluded that if the abietane and pimarane diterpene acids interfere with the biology of Diprion pini they cannot however be considered as the most important factors in the natural equilibria of this species. Pinus sylvestris I Diprion pini I Diprionidae sawfly abletane and pimarane diterpene acids pine foliage seasonal average variation antifeedant property Résumé - Evolution des acỉdes diterpéniques de types abỉétỉque et pimarique dans le feuillage du pin Sylvestre pinus sylvestris L impact de I age .

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