Browse Publications Technical Papers 2009-01-2566

Study on the Growing Characteristics of Lettuce (var. Youmaicai) Cultivated at Elevated CO 2 Concentrations in Controlled Environment 2009-01-2566

Lettuce (Lactuca sativa var. Youmaicai) was cultivated at higher atmospheric CO2 concentration gradients (0.05∼2.0%), and then some parameters such as comprehensive evaluation of plant growing states, rates of photosynthesis and transpiration were carried out. There were some positive effects of elevated CO2 (0.1% to 1.0%) on the average rates of photosynthesis and transpiration of the collective lettuce leaves and the contents of chlorophyll and carotenoid, but excessive CO2 (1.5% and 2.0%) weakened the effects, and even had some negative impacts; average shoot height and leaf area of lettuce plants treated at 0.1%∼2.0% CO2 all increased, but the numbers of leaves reduced; The contents of nitrogen, potassium and vitamin C in plants decreased, but phosphorus content rose and microelement contents had no obvious change in various CO2 treatments. The lettuce can grow nearly normally at higher atmospheric CO2 concentration without serious growing inhibition or death, which indicated that the Youmaicai held strong ability of tolerating higher concentration of CO2, so it's suitable to be determined as a candidate biological component in controlled ecological life support system (CELSS).


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