University of Almería, Almería, 04120, Spain.
Plant Foods Hum Nutr. 2021 Jun;76(2):210-218. doi: 10.1007/s11130-021-00894-8. Epub 2021 Apr 7.
Recent studies show that vegetables at early stage of development contain higher amounts of phytonutrients and minerals, and lower amounts of nitrates than at fully developed stage. Nevertheless, the effects of some spectrum light on the carotenoid content of lettuce microgreens are unknown. Three different LED lamps were checked: (i) artificial white light (T); (ii) continuous light-emitting diodes with longer blue-wavelength (T), and (iii) continuous light-emitting diodes with longer red-wavelength (T). Different lettuce cvs. were grown under the above described lamps. Plants were collected after 10, 15, 35 and 50 days from planting to produce sprouts, microgreens, initial baby leaf, and baby leaf, respectively. Response to different continuous spectrum lights related to productivity and nitrate content was variable for the different plants. Accumulation of nitrates at initial stages in plant tissues was clearly lower than at final stages of crop development, ranging from 50.2 to 73.4 mg 100 g fresh weight for T. Lettuce consumption is preferable at microgreen stage in comparison with baby leaf stage. Nitrate amounts at microgreen stage were lower than in baby leaf stage, and this content was inversely correlated with carotenoid content, which in tissues was higher at microgreens stage influenced by LED.
最近的研究表明，处于发育早期的蔬菜中含有更高水平的植物营养素和矿物质，硝酸盐含量则低于完全发育的蔬菜。然而，某些光谱光对生菜芽苗菜类胡萝卜素含量的影响尚不清楚。为此，我们检查了三种不同的 LED 灯：（i）人工白光（T）；（ii）长波连续发光二极管（T）；（iii）长波连续发光二极管（T）。不同的生菜品种在上述描述的灯下发芽。在种植后 10、15、35 和 50 天，分别收获芽苗、芽苗菜、初生婴儿叶和婴儿叶。不同植物对不同连续光谱光的反应与生产力和硝酸盐含量有关，存在差异。在作物发育的初始阶段，植物组织中硝酸盐的积累明显低于终末阶段，T 下的硝酸盐含量范围为 50.2 至 73.4mg/100g 鲜重。与婴儿叶阶段相比，生菜在芽苗菜阶段的食用更受欢迎。芽苗菜阶段的硝酸盐含量低于婴儿叶阶段，且与类胡萝卜素含量呈负相关，LED 会影响组织中类胡萝卜素含量，使芽苗菜阶段的含量更高。
