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Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài: Quantitative variations of taxifolin and its glucoside in Pinus sylvestris needles consumed by Diprion pini larvae. | 135 Ann Sci For 1994 51 135-146 Elsevier INRA Original article Quantitative variations of taxifol in and its glucoside in Pinus sylvestris needles consumed by Diprion pini larvae MA Auger 1 c Jay-Allemand 2 c Bastien 2 c Geri 1 1INRA Station de Zoologie Forestiere 2INRA Station dAmélioration des Arbres Forestiers F-45160 Ardon France Received 22 March 1993 accepted 2 November 1993 Summary The relationships between quantitative variations of 2 flavanonols in Scots pine needles and Diprion pint larvae mortality were studied. Those 2 compounds were characterized as taxifolin T and its glucoside TG after hydrolysis and analysis by TLC HPLC and spectrophotometry. Quantitative differences between 30 clones were more important for TG than for T nevertheless clones which presented a content of taxifolin higher than 1.5 mg g 1 DW showed a T TG ratio equal to or greater than 0.5 fig 2 . Quantitative changes were also observed throughout the year. The amount of taxifolin peaked in autumn as those of its glucoside decreased fig 3 . Darkness also induced a gradual increase of T but no significant effect on TG fig 4 . Storage of twigs during feeding tests and insect defoliation both induced a strong glucosilation of taxifolin in needles table I . High rates of mortality of Diprion pint larvae were associated with the presence of T and TG both in needles and faeces table II . Preliminary experiments of feeding bioassay with needles supplemented by taxifolin showed a significant reduction of larval development but no direct effect on larval mortality table III . Regulation processes between taxifolin and its glucoside which could involve glucosidases and or transferases are discussed for the genetic and environmental factors studied. Pinus sylvestris I Diprion piniI larvae taxifolin taxifolin glucoside Resume Variations quantitatives de la taxifoline et de son glucoside dans les aiguilles de Pinus sylvestris consommées par les larves de Diprion pint L. Les relations entre le .
