Yang Biyun, Zhou Xiangzhu, Xu Ru, Wang Jin, Lin Yizhang, Pang Jie, Wu Shuang, Zhong Fenglin
College of Horticulture, Fujian Agriculture and Forestry UniversityFuzhou, China; Institute of Vegetable Crops, Fujian Agriculture and Forestry UniversityFuzhou, China.
College of Horticulture, Fujian Agriculture and Forestry University Fuzhou, China.
Front Plant Sci. 2016 Nov 29;7:1788. doi: 10.3389/fpls.2016.01788. eCollection 2016.
Light is essential for plant growth. Light intensity, photoperiod, and light quality all affect plant morphology and physiology. Compared to light intensity, photoperiod, little is known about the effects of different monochromatic lights on crop species. To investigate how different lighting conditions influence crops with heterogeneous colors in leaves, we examined photosynthetic characteristics and quality (regarding edibility and nutrition) of purple cabbage under different combinations of lights. Eight different treatments were applied including monochromic red (R), monochromic blue (B), monochromic yellow (Y), monochromic green (G), and the combination of red and blue (3/1, RB), red/blue/yellow (3/1/1, RBY), red/blue/green (3/1/1,RBG), and white light as the control. Our results indicate that RBY (3/1/1) treatment promotes the PSII activity of purple cabbage, resulting in improved light energy utilization. By contrast, both G and Y lights alone have inhibitory effect on the PSII activity of purple cabbage. In addition, RBY (3/1/1) significantly boosts the anthocyanin and flavonoids content compared with other treatments. Although we detected highest soluble protein and vitamin C content under B treatment (increased by 30.0 and 14.3% compared with the control, respectively), RBY (3/1/1) appeared to be the second-best lighting condition (with soluble protein and vitamin C content increased by 8.6 and 4.1%, respectively compared with the control). Thus we prove that the addition of yellow light to the traditional combination of red/blue lighting conditions is beneficial to synthesizing photosynthetic pigments and enables superior outcome of purple cabbage growth. Our results indicate that the growth and nutritional quality of purple cabbage are greatly enhanced under RBY (3/1/1) light, and suggest that strategical management of lighting conditions holds promise in maximizing the economic efficiency of plant production and food quality of vegetables grown in controlled environments.
光照对植物生长至关重要。光照强度、光周期和光质都会影响植物的形态和生理。与光照强度和光周期相比，不同单色光对作物品种的影响知之甚少。为了研究不同光照条件如何影响叶片颜色各异的作物，我们检测了紫甘蓝在不同光照组合下的光合特性以及品质（食用性和营养方面）。采用了八种不同处理，包括单色红光（R）、单色蓝光（B）、单色黄光（Y）、单色绿光（G），以及红蓝光组合（3/1，RB）、红/蓝/黄（3/1/1，RBY）、红/蓝/绿（3/1/1，RBG），并以白光作为对照。我们的结果表明，RBY（3/1/1）处理促进了紫甘蓝的PSII活性，从而提高了光能利用率。相比之下，单独的绿光和黄光对紫甘蓝的PSII活性均有抑制作用。此外，与其他处理相比，RBY（3/1/1）显著提高了花青素和类黄酮含量。虽然我们在蓝光处理下检测到最高的可溶性蛋白和维生素C含量（分别比对照增加了30.0%和14.3%），但RBY（3/1/1）似乎是第二优的光照条件（可溶性蛋白和维生素C含量分别比对照增加了8.6%和4.1%）。因此我们证明，在传统红/蓝光照条件下添加黄光有利于光合色素的合成，并能使紫甘蓝生长取得更好的结果。我们的结果表明，在RBY（3/1/1）光照下紫甘蓝的生长和营养品质得到了极大提升，并表明光照条件的策略性管理有望在最大化植物生产的经济效益和控制环境中种植蔬菜的食品质量方面发挥作用。
