Responses to temperature and shade in Abies alba seedlings from diverse provenances
2005
Robakowski, Piotr | Montpied, Pierre | Dreyer, Erwin
Intraspecific variability in responses to temperature and shade was studied at Champenoux, north-eastern France, with seedlings from five Polish provenances of silver fir (Abies alba Mill.). Acclimation of photosynthesis to temperature was investigated in seedlings exposed to 10, 25 and 358C in a climate chamber for 1 week. During two growth seasons, a population of seedlings was grown in the nursery under four different irradiance regimens: 100, 48, 18 and 8% of natural irradiance. Maximum carboxylation rate (Vcmax), maximum light driven electron flow (Jmax) and maximum net carbon dioxide assimilation rate (Amax) measured at 258C increased with population altitude. One week of exposure to 358C caused discoloration and massive needle shedding. After 2 years’ acclimation to different levels of irradiance, a significant interprovenance variability was evidenced in growth, total biomass, biomass allocation and photosynthetic performance. This study provided evidence for the existence of functional variation among the examined provenances.
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