收获时及采后贮藏期间光子光谱对婴儿叶生菜生长和营养属性的调控
Regulation of the Photon Spectrum on Growth and Nutritional Attributes of Baby-Leaf Lettuce at Harvest and during Postharvest Storage.
作者信息
Vaštakaitė-Kairienė Viktorija, Kelly Nathan, Runkle Erik S
机构信息
Department of Horticulture, Michigan State University, 1066 Bogue Street, East Lansing, MI 48824-1325, USA.
Lithuanian Research Centre for Agriculture and Forestry, Institute of Horticulture, Kaunas Street 30, LT-54333 Babtai, Lithuania.
出版信息
Plants (Basel). 2021 Mar 14;10(3):549. doi: 10.3390/plants10030549.
The photon flux density (PFD) and spectrum regulate the growth, quality attributes, and postharvest physiology of leafy vegetables grown indoors. However, limited information is available on how a photon spectrum enriched with a broad range of different wavebands regulates these factors. To determine this, we grew baby-leaf lettuce 'Rouxai' under a PFD of 200 µmol m s provided by warm-white (WW; control) light-emitting diodes (LEDs) supplemented with either 30 µmol m s of ultraviolet-A (+UV30) or 50 µmol m s of blue (+B50), green (+G50), red (+R50), or WW (+WW50) light. We then quantified growth attributes and accumulated secondary metabolites at harvest and during storage in darkness at 5 °C. Additional +G50 light increased shoot fresh and dry weight by 53% and 59% compared to the control. Relative chlorophyll concentration increased under +UV30, +G50, and especially +B50. At harvest, +B50 increased total phenolic content (TPC) by 25% and anthocyanin content (TAC) by 2.0-fold. Additionally, +G50 increased antiradical activity (DPPH) by 29%. After each day of storage, TPC decreased by 2.9 to 7.1% and DPPH by 3.0 to 6.2%, while TAC degradation was less pronounced. Principal component analysis indicated a distinct effect of +G50 on the lettuce at harvest. However, concentrations of metabolites before and during storage were usually greatest under the +B50 and +R50 treatments.
光子通量密度（PFD）和光谱调节室内种植叶菜类蔬菜的生长、品质属性及采后生理学特性。然而，关于富含多种不同波段的光子光谱如何调节这些因素的信息有限。为了确定这一点，我们在由暖白色（WW；对照）发光二极管（LED）提供的200 μmol m⁻² s⁻¹ 的PFD下种植小叶生菜‘鲁赛’，并分别补充30 μmol m⁻² s⁻¹ 的紫外线-A（+UV30）或50 μmol m⁻² s⁻¹ 的蓝光（+B50）、绿光（+G50）、红光（+R50）或暖白色光（+WW50）。然后，我们在收获时以及在5℃黑暗储存期间对生长属性进行了量化，并测定了次生代谢产物的积累量。与对照相比，额外的+G50光使地上部鲜重和干重分别增加了53%和59%。在+UV30、+G50尤其是+B50处理下，相对叶绿素浓度增加。收获时，+B50使总酚含量（TPC）增加了25%，花青素含量（TAC）增加了2.0倍。此外，+G50使抗自由基活性（DPPH）提高了29%。储存的每一天后，TPC下降了2.9%至7.1%，DPPH下降了3.0%至6.2%，而TAC的降解不太明显。主成分分析表明，+G50在收获时对生菜有明显影响。然而，在+B50和+R50处理下，储存前和储存期间代谢产物的浓度通常最高。
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