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Site temperatures influence seasonal changes in terpene composition in Douglas-fir vegetative buds and current-year foliage

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Over a 3-year period (1998–2000), variations in terpene composition was measured in vegetative buds of Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) from six sites varying in elevation and geographic location with sampling from early spring to midsummer. Eleven terpenes were found in virtually all samples (tricyclene, α-pinene, camphene, sabinene, -pinene, myrcene, Δ-3-carene, limonene, -phellandrene, terpinolene, and bornyl acetate) and represented an average of 87% of the total terpenes. In each year, composition of the terpene mix varied significantly (P <= 0.05) for all sites and dates, with some significant site and date interactions. Degree-day accumulations were calculated for all sites and years. Patterns of change in terpene composition between sites, areas, and years were strongly related to the temperature regimes associated with site and year.

Les variations dans la composition en terpènes des bourgeons végétatifs de douglas vert (Pseudotsuga menziesii (Mirb.) Franco) ont été mesurées sur une période de 3 ans (1998-2000) en prélevant des échantillons du début du printemps jusqu'au milieu de l'été dans six sites situés à différents endroits et à différentes altitudes. Onze terpènes ont été observés dans presque tous les échantillons (tricyclène, α-pinène, camphène, sabinène, -pinène, myrcène, Δ-3-carène, -phellendrène, terpinolène et acétate de bornyle) et représentaient en moyenne 87 % du total des terpènes. À chaque année, la composition du mélange de terpènes était significativement différente (P <= 0,05) pour chaque date et chaque site avec quelques interactions significatives entre les dates et les sites. Les accumulations de degrés-jours ont été calculées pour tous les sites et toutes les années. Les patrons de variation dans la composition en terpènes entre les sites, les zones et les années étaient fortement reliés aux régimes de température associés à chaque site et à chaque année.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: November 1, 2003

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