NDLI: Assessment and Implications of Intraspecific and Phenological Variability in Monoterpenes of Scots Pine (Pinus sylvestris) Foliage

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Assessment and Implications of Intraspecific and Phenological Variability in Monoterpenes of Scots Pine (Pinus sylvestris) Foliage

Content Provider	Springer Nature Link
Author	Thoss, Vera O’Reilly Wapstra, Julianne Iason, Glenn R.
Copyright Year	2007
Abstract	Scots pine populations contain individuals with widely differing amounts and composition of monoterpenes and exist as one of two chemotypes: with or without Δ$^{3}$-carene. We investigated the significance for ecological studies of two types of variation in monoterpenes: (1) the inherent variability in the concentration of monoterpenes or their relative amounts in needles of seedlings, saplings, and mature trees; and (2) phenological variation in developing needles. The relative composition of needle monoterpenes in 5-year-old saplings changed during the needle development period until the final composition was reached upon needle maturity. Changes in composition depended on chemotype. Needles of the “no-Δ$^{3}$-carene” chemotype had higher absolute concentrations of α-pinene, β-pinene, camphene, and total monoterpenes than “Δ$^{3}$-carene” chemotype. For the “Δ$^{3}$-carene” chemotype, the relative concentration of Δ$^{3}$-carene during the needle growing season and immediately after emergence of seedlings was higher compared to that reached at needle maturity. Repeated removal of single needles (at weekly intervals during growth) from 5-year-old saplings did not influence the composition of monoterpenes. Within a natural Scots pine dominated woodland, 18% of mature Scots pines (N = 574) belonged to the “no-Δ$^{3}$-carene” chemotype. Chemotypic variation within populations means that the statistical power with which differences in monoterpene concentrations can be detected is lower when sampling from the whole population compared to sampling within chemotypes. Reduction of this background variation and accounting for chiral variation if present, would significantly aid efficiency, interpretation, and understanding of processes in chemical and ecological research. One method for achieving this is the screening of plants for chemotypes before the establishment of experiments or field sampling regimes. We present a summary of suitable analytical methods for needle tissue that facilitates this prior screening.
Starting Page	477
Ending Page	491
Page Count	15
File Format	PDF
ISSN	00980331
Journal	Journal of Chemical Ecology
Volume Number	33
Issue Number	3
e-ISSN	15731561
Language	English
Publisher	Kluwer Academic Publishers-Plenum Publishers
Publisher Date	2007-02-01
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Absolute concentration α-pinene Camphene β-pinene Δ$^{3}$-carene Chemotypes Relative composition Seasonal variation Physical Chemistry Agriculture Ecology Biological Microscopy
Content Type	Text
Resource Type	Article
Subject	Medicine Biochemistry Ecology, Evolution, Behavior and Systematics

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