Quality changes in hydroponic lettuce grown under pre-harvest short-duration continuous light of different intensities
Quality changes in hydroponic lettuce grown under pre-harvest short-duration continuous light of different intensities
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DOI：
10.1080/14620316.2012.11512890
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发表时间：
2012-09-01
影响因子：
1.9
通讯作者：
Yang, Q. C.
中科院分区：
文献类型：
--
作者：
Zhou, W. L.;Liu, W. K.;Yang, Q. C.
研究了采前光照强度对水培生菜品质的影响。capitata L.）通过在由红色或蓝色发光二极管（LED）以4.0的红色：蓝色比率提供的48小时连续照明下种植莴苣来研究。四个光照强度处理（50，100，150，或200 μ mol m（-2）S-1）。结果表明，连续光照处理48 h后，生菜地上部硝酸盐含量显著降低，可溶性糖和维生素C含量显著增加。结果表明，采前短持续光照（PSCL）对生菜品质的改善效果受光照强度的影响显著。在50 μ mol m（-2）s（-1）的光强下，硝酸盐浓度的降低以及可溶性糖和维生素C含量的增加相对较低，但随着光强从50 μ mol m（-2）s（-1）增加到200 pmol m（-2）s（-1），硝酸盐浓度的降低以及可溶性糖和维生素C含量的增加逐渐增加。然而，当光强增加超过100 μ mol M-2 S-1时，增加光强降低硝酸盐浓度和增加维生素C含量的边际效益迅速下降。因此，PSCL是改善生菜品质的有效方法，其最佳经济光照强度为100 pmol m（-2）s（-1）~ 150 μ mol m（-2）s（-1）。
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.