Quality changes in hydroponic lettuce grown under pre-harvest short-duration continuous light of different intensities

文献类型： 外文期刊

第一作者： Zhou, W. L.

作者： Zhou, W. L.;Liu, W. K.;Yang, Q. C.;Zhou, W. L.;Liu, W. K.;Yang, Q. C.

作者机构：

期刊名称：JOURNAL OF HORTICULTURAL SCIENCE & BIOTECHNOLOGY （ 影响因子：1.641； 五年影响因子：1.616 ）

ISSN： 1462-0316

年卷期： 2012 年 87 卷 5 期

页码：

收录情况： SCI

摘要： The effect of pre-harvest light intensity on the quality of hydroponically-grown lettuce (Lactuca sativa var. capitata L.) was studied by growing lettuce under 48 h of continuous illumination delivered by red- or blue-light-emitting diodes (LEDs) with a red:blue ratio of 4.0. Four light intensity treatments (50, 100, 150, or 200 mu mol m(-2) S-1) were applied. The results showed that the nitrate concentrations in lettuce shoots decreased significantly after treatment with 48 h of continuous light, while the contents of soluble sugars and vitamin C increased substantially. It was observed that the effect of pre-harvest short-duration continuous light (PSCL) on improving lettuce quality was significantly influenced by the intensity of the light. The decrease in nitrate concentration and the increases in soluble sugars and vitamin C contents were relatively low at a light intensity of 50 mu mol m(-2) s(-1), but increased gradually as the light intensity increased from 50 mu mol m(-2) s(-1) to 200 pmol m(-2) s(-1). However, the marginal benefit of increased light intensity in lowering nitrate concentration and increaseing vitamin C content declined rapidly when the light intensity increased beyond 100 mu mol M-2 S-1. In conclusion, PSCL offers an effective method by which to improve the quality of lettuce, and a light intensity of between 100 pmol m(-2) s(-1) - 150 mu mol m(-2) s(-1) is the economic optimum.

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