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The influence of irradiance, CO 2  concentration, and air temperature on leaf and whole-plant net C exchange rate (NCER) of  Alstroemeria  `Jacqueline' was studied. At ambient CO 2 , leaf net photosynthesis was maximum at irradiances above 600 μmol·m -2 ·s -1  photosynthetically active radiation (PAR), while whole-plant NCER required 1200 μmol·m -2 ·s -1  PAR to be saturated. Leaf and whole-plant NCERs were doubled under CO 2  enrichment of 1500 to 2000 μl CO 2 /liter. Leaf and whole-plant NCERs declined as temperature increased from 20 to 35C. Whereas the optimum temperature range for leaf net photosynthesis was 17 to 23C, whole-plant NCER, even at high light and high CO 2 , declined above 12C. Dark respiration of leaves and whole plants increased with a Q 10  of ≈2 at 15 to 35C. In an analysis of day effects, irradiance, CO 2  concentration, and temperature contributed 58%, 23%, and 14%, respectively, to the total variation in NCER explained by a second-order polynomial model ( R  2  = 0.85). Interactions among the factors accounted for 4% of the variation in day C assimilation. The potential whole-plant growth rates during varying greenhouse day and night temperature regimes were predicted for short- and long-day scenarios. The data are discussed with the view of designing experiments to test the importance of C gain in supporting flowering and high yield during routine harvest of  Alstroemeria  plants under commercial greenhouse conditions.

journal of the american society for horticultural science

Net Carbon Dioxide Exchange Rates and Predicted Growth Patterns in Alstroemeria `Jacqueline' at Varying Irradiances, Carbon Dioxide Concentrations, and Air Temperatures