Genetic Contributions to Phenotypic Variation in Physiology, Growth, and Vigor of Western Aspen (Populus tremuloides) Clones

Authors: St. Clair, Samuel B.; Mock, Karen E.; LaMalfa, Eric M.; Campbell, Robert B.; Ryel, Ronald J.

Source: Forest Science, Volume 56, Number 2, April 2010 , pp. 222-230(9)

Publisher: Society of American Foresters

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Abstract:

In aspen and other plant species the effects of environment on phenotype are generally better characterized than genotypic influences. Furthermore, little is known about how genetic influences on tree phenotype change over time. We assessed clonal differences in 417 ramets, representing 18 clones, in a common garden of quaking aspen (Populus tremuloides Michx.) that have developed over 27 years. Genetic contributions to variation in physiology, growth, and vigor were determined over seasonal and multidecadal time scales. The 18 aspen clones exhibited wide-ranging phenotypic variation with two- to threefold differences in physiology and growth traits and more than sevenfold differences in canopy decline and mortality. For growth traits, strong genetic correlations (typically greater than 0.70) and heritability (estimates maintained in a range of 0.25 to 0.36), indicate that genotype had a moderate and consistent influence on growth over the three decades of the study. Physiological traits had much lower genetic correlations and heritability estimates, and they changed significantly within a single growing season. Climatic data suggest that dry conditions in the common garden as the summer progressed may have had a controlling influence on physiological trait responses. Characterizing genetically based phenotypic variation and how it contributes to clone vigor provides a critical link to understanding constraints to aspen viability in its western range.

Keywords: drought; genotype; heritability; photosynthesis; traits

Document Type: Research Article

Publication date: April 1, 2010

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  • Forest Science is a peer-reviewed journal publishing fundamental and applied research that explores all aspects of natural and social sciences as they apply to the function and management of the forested ecosystems of the world. Topics include silviculture, forest management, biometrics, economics, entomology & pathology, fire & fuels management, forest ecology, genetics & tree improvement, geospatial technologies, harvesting & utilization, landscape ecology, operations research, forest policy, physiology, recreation, social sciences, soils & hydrology, and wildlife management.
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