Abstract
Greenhouse and laboratory experiments were conducted to determine the effect of irradiance level on growth and photosynthesis of three Populus × euramericana clones selected to exhibit differences in growth rate when grown under full sunlight. Individual plants were started from apical cuttings and grown in the greenhouse for 13 weeks under three levels of shading (37%, 75%, and 100% full light). Rates of leaf and whole plant photosynthesis and dark respiration were measured with an infrared gas analyzer.Clone 5323 grew relatively well under all irradiance levels, and the older leaves of this clone had the highest photosynthetic rates per unit leaf area under the higher growth irradiances. Clone 5326, which had the least growth, also had the lowest per-plant photosynthesis rate under all irradiance levels. Clone 5321 had per-plant photosynthetic rates comparable with those of clone 5323 but a higher dark respiration rate when grown at the high irradiance levels.
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