Study on the Growing Characteristics of Lettuce Cultivated at Elevated CO_2 Concentrations in Controlled Environment
- VernacularTitle:受控环境中高CO_2浓度条件下油麦菜生长特性研究
- Author:
Shuangsheng GUO
;
Yongkang TANG
;
Weidang AI
;
Lifeng QIN
- Publication Type:Journal Article
- Keywords:
lettuce (var.Youmaicai);
elevated CO2 concentration;
controlled environment;
growing characteristics
- From:Space Medicine & Medical Engineering
2006;0(02):-
- CountryChina
- Language:Chinese
-
Abstract:
Objective To investigate growing characteristics of plants grown at elevated CO2 concentrations in controlled environment and provide base for determination of biological components in future space controlled ecological life support system (CELSS).Methods Lettuce (Lactuca sativa var.Youmaicai) was cultivated at higher atmospheric CO2 concentration gradient (0.05%～2.0%).Its growing status,physiological characteristics and the content of nutrients were evaluated.Results There were some active 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 these effects,and even had some negative impacts.Lettuce could grow normally at elevated CO2 (0.1% to 2.0%),average shoot height and leaf area of lettuce plants treated at 0.1%～2.0% CO2 all increased,but the numbers of leaves eliminated gradually.The contents of nitrogen,potassium and Vc in plants decreased,phosphorus content rose and microelement contents had no obvious change in various CO2 treatments.Conclusion The lettuce can grow nearly normally at higher atmospheric CO2 concentration without serious growing inhibition or death,which indicated that the Youmaicai held stronger ability of tolerating higher concentration of CO2,so it's suitable to be determined as a candidate biological component in CELSS.
