Concentration of phenolic compounds is increased in lettuce grown under high light intensity and elevated CO2
Concentration of phenolic compounds is increased in lettuce grown under high light intensity and elevated CO2
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DOI：
10.1016/j.plaphy.2017.12.010
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发表时间：
2018-02-01
影响因子：
6.5
通讯作者：
Munoz-Rueda, Alberto
中科院分区：
文献类型：
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作者：
Perez-Lopez, Usue;Sgherri, Cristina;Munoz-Rueda, Alberto
目前的研究主要集中在生菜上，生菜是一种广泛食用的叶类蔬菜，含有大量有益健康的酚类化合物。两个不同颜色的生菜品种，即一个无氰-绿叶cv。为了评估环境条件如何影响次生酚代谢物的产生，从而影响生菜的品质，我们在强光强或二氧化碳浓度升高或两者兼有的情况下进行了种植。在短时间内施加轻度光胁迫或二氧化碳浓度升高，两种生菜的酚类化合物和抗氧化能力都有所增加，这表明栽培措施可以提高生菜的健康效益。酚谱与色素沉着和花青素红cv有关。总能保持较高的酚含量和抗氧化能力。其中，槲皮素、槲皮素-3- o -葡糖苷、山奈酚、槲皮素和芦丁在强光或高CO2条件下积累较多。而花青素衍生物在环境和升高的CO2下对轻度光胁迫都有反应。在这两种情况下，总游离酚酸和共轭酚酸在所有改变的环境条件下都保持较高的值，而木犀草素在两种环境条件下都达到了显著的量，这表明，在最后一种情况下，类黄酮合成的酶调节可能受到不同的影响，黄酮类的合成受到青睐。
The present study was focused on lettuce, a widely consumed leafy vegetable for the large number of healthy phenolic compounds. Two differently-pigmented lettuce cultivars, i.e. an acyanic-green leaf cv. and an anthocyanic-red one, were grown under high light intensity or elevated CO2 or both in order to evaluate how environmental conditions may affect the production of secondary phenolic metabolites and, thus, lettuce quality. Mild light stress imposed for a short time under ambient or elevated CO2 concentration increased phenolics compounds as well as antioxidant capacity in both lettuce cvs, indicating how the cultivation practice could enhance the health-promoting benefits of lettuce. The phenolic profile depended on pigmentation and the anthocyanic-red cv. always maintained a higher phenolic amount as well as antioxidant capacity than the acyanic-green one. In particular, quercetin, quercetin-3-O-glucuronide, kaempferol, quercitrin and rutin accumulated under high light or high CO2 in the anthocyanic-red cv., whereas cyanidin derivatives were responsive to mild light stress, both at ambient and elevated CO2. In both cvs total free and conjugated phenolic acids maintained higher values under all altered environmental conditions, whereas luteolin reached significant amounts when both stresses were administered together, indicating, in this last case, that the enzymatic regulation of the flavonoid synthesis could be differently affected, the synthesis of flavones being favored.