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ENVIRONMENTAL MODIFICATION OF YIELD AND NUTRIENT COMPOSITION OF ?WALDMANN'S GREEN? LEAF LETTUCE
Journal of Food Quality ( IF 2.6 ) Pub Date : 1997-01-01 , DOI: 10.1111/j.1745-4557.1997.tb00453.x
C A Mitchell 1 , C Chun , W E Brandt , S S Nielsen
Affiliation  

Leaf number, dry weight, and nutrient composition of Lactuca sativa L. cv. Waldmann's Green leaves were compared following 9 days of treatment in a controlled environment room under various combinations of photosynthetic photon flux (PPF:350 vs 800 micromoles m-2 s-1), atmospheric CO2 level (ambient vs 1500 micromoles mol-1), and single-strength (1X:15 mM) vs double-strength (2X:30 mM) nitrogen (N) as NO3- alone or as NH4(+) + NO3- (1:5 molar ratio). CO2 enrichment greatly enhanced leaf number under all PPF and N conditions, but increased leaf dry weight only at high PPF. Conditions favoring high photosynthesis enhanced leaf starch content 3-fold, and protein content increased as much as 64% with 2X NH4(+)+NO3-. Free sugar content was 6 to 9% of leaf dry weight for all treatment combinations, while fat was 1.5 to 3.5%. Ash content varied from 15 to 20% of leaf dry weight. Modified controlled environments can be used to enhance the nutritional content as well as the yield of crops to be used for life support in space-deployed, self-sustaining human habitats. Leaf lettuce is a useful model crop for demonstrating the potential of nutritional value added by environmental manipulation.

中文翻译:


环境对“Waldmann's Green”产量和营养成分的影响叶用生菜



莴苣 (Lactuca sativa L. cv.) 的叶数、干重和营养成分。在受控环境室中处理 9 天后,在光合光子通量(PPF:350 与 800 微摩尔 m-2 s-1)、大气 CO2 水平(环境与 1500 微摩尔 mol-1)、以及单强度 (1X:15 mM) 与双强度 (2X:30 mM) 氮 (N),单独为 NO3- 或 NH4(+) + NO3-(摩尔比为 1:5)。在所有 PPF 和 N 条件下,CO2 富集极大地增加了叶片数量,但仅在高 PPF 下增加了叶片干重。有利于高光合作用的条件使叶片淀粉含量提高了 3 倍,蛋白质含量在 2X NH4(+)+NO3- 下增加了 64%。所有处理组合的游离糖含量为叶干重的 6% 至 9%,而脂肪含量为 1.5% 至 3.5%。灰分含量为叶干重的 15% 至 20%。改良的受控环境可用于提高农作物的营养成分和产量,这些农作物可用于太空部署、自我维持的人类栖息地的生命支持。生菜是一种有用的模型作物,可以展示通过环境操纵增加营养价值的潜力。
更新日期:1997-01-01
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