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The Influence of Genetic and Environmental Factors on a Quantitative Defensive Trait in Spruce

D. Wainhouse and R. Ashburner
Functional Ecology
Vol. 10, No. 1 (Feb., 1996), pp. 137-143
DOI: 10.2307/2390272
Stable URL: http://www.jstor.org/stable/2390272
Page Count: 7
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
The Influence of Genetic and Environmental Factors on a Quantitative Defensive Trait in Spruce
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Abstract

1. Lignified stone cell masses in Spruce bark are an important physical defence against insects and fungi and in Sitka Spruce and this defensive trait was influenced by both genetic and environmental factors. Single-tree, family and provenance mean heritability of the trait were 0.22, 0.68 and 0.79-0.95 respectively. 2. There was a distinct, clinal, increase in bark lignin with increasing latitude of provenance origin. Relative differences in bark lignin content between provenances were similar at four sites but absolute amounts were strongly site dependent. 3. Tree growth also varied systematically between provenances and differed between sites but we found no compelling evidence of a direct trade-off between growth and this quantitative defence. 4. Variation in growth and defence between provenances appeared to reflect, independently, climatic limitations in the native habitat.

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