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Cortical Monoterpene Variation Among Slash Pine Ramets by Season, Aspect, Crown Position, and Bud Vigor

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Cortical monoterpene composition from all buds of four grafted ramets, 10-12 years old, from one clone, was analysed to determine the best location and time of year to sample to obtain repeatable values in determining individual tree phenotypes. A total of 1,415 buds were analysed representing various sampling positions in the crown during the 4 seasons of the year. The content of α-pinene, -pinene, and -phellandrene in individual buds ranged from 19.0 to 47.7, 18.2 to 59.4, and 4.5 to 31.9 percent, respectively. Statistically significant differences were found among the sampling units for the three monoterpenes for crown position, bud vigor, and season of year; however, these differences were relatively small and each grouping gave essentially the same tree phenotype. No differences were found between aspects. In a separate analysis it was determined that sampling five buds from the lower crown would give a monoterpene phenotype within 5 percent of the bud population mean for all three major monoterpenes with a 95 percent confidence limit. Bud diameter and length of flush increased progressively from the lower to upper crown and low- to high-vigor buds. Flush lengths and bud diameters were the same for both aspects of the trees. Forest Sci. 32:605-613.

Keywords: Pinus elliottii; clone; gum; limonene; myrcene; oleoresin; terpene; α-phellandrene; α-pinene; -phellandrene; -pinene

Document Type: Journal Article

Affiliations: Station Statistician, Forestry Sciences Laboratory, Carlton Street, Athens, GA 30602

Publication date: September 1, 1986

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