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Title: Dynamic phenotypic plasticity in photosynthesis and biomass patterns in Douglas-fir seedlings

Author: Koehn, A. C.; McDonald, G. I.; Turner, D. L.; Adams, D. L.;

Date: 2010

Source: Res. Pap. RMRS-RP-79. Fort Collins, CO: U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station. 14 p.

Publication Series: Research Paper (RP)

Description: As climate changes, understanding the mechanisms long-lived conifers use to adapt becomes more important. Light gradients within a forest stand vary constantly with the changes in climate, and the minimum light required for survival plays a major role in plant community dynamics. This study focuses on the dynamic plasticity of Douglas-fir (Pseudotsuga menziesii var. glauca [Beissn.] Franco) seedlings grown in contrasting light environments. Plasticity in Douglas-fir seedlings was primarily achieved by a combination of the physiological processes: maximum photosynthesis, quantum yield, Fv/Fm, Km (the light constant), light compensation point, and the ratio of needle area to needle weight (specific leaf area). Specific leaf area was the most plastic of the biomass parameters measured.

Keywords: Pseudotsuga menziesii var. glauca (Beissn.) Franco, dynamic phenotypic plasticity, photosynthesis, Douglas-fir, biomass allocation, light constant

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Koehn, A. C.; McDonald, G. I.; Turner, D. L.; Adams, D. L. 2010. Dynamic phenotypic plasticity in photosynthesis and biomass patterns in Douglas-fir seedlings. Res. Pap. RMRS-RP-79. Fort Collins, CO: U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station. 14 p.

 


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