Chongqing Engineering Research Center for Optoelectronic Materials and Devices, Research Institute for New Materials Technology, Chongqing University of Arts and Sciences, Chongqing 402160, People's Republic of China.
Institute of High Technology Physics, Tomsk Polytechnic University, Tomsk 634050, Russia.
Sci Rep. 2017 Apr 3;7:45944. doi: 10.1038/srep45944.
Light plays a vital role on the growth and development of plant. On the base of white light with high color rendering to the benefit of human survival and life, we proposed to improve "color rendering" of LED lighting for accelerating the growth of lettuce. Seven spectral LED lights were adopted to irradiate the lettuces under 150 μmol·m·s for a 16 hd photoperiod. The leaf area and number profiles, plant biomass, and photosynthetic rate under the as-prepared LED light treatments were investigated. We let the absorption spectrum of fresh leaf be the emission spectrum of ideal light and then evaluate the "color rendering" of as-prepared LED lights by the Pearson product-moment correlation coefficient and CIE chromaticity coordinates. Under the irradiation of red-yellow-blue light with high correlation coefficient of 0.587, the dry weights and leaf growth rate are 2-3 times as high as the sharp red-blue light. The optimized LED light for lettuce growth can be presumed to be limited to the angle (about 75°) between the vectors passed through the ideal light in the CIE chromaticity coordinates. These findings open up a new idea to assess and find the optimized LED light for plant growth.
光是植物生长和发育的重要因素。在以高显色性的白光为基础，以利于人类生存和生活的前提下，我们提出了提高 LED 照明的“显色性”以加速生菜生长的设想。在 150 μmol·m·s 的光照强度和 16 h 的光周期下，采用七种光谱 LED 灯照射生菜。研究了在制备的 LED 光处理下生菜的叶面积和数量分布、植物生物量和光合速率。我们让新鲜叶片的吸收光谱成为理想光的发射光谱，然后通过 Pearson 积矩相关系数和 CIE 色度坐标来评估制备的 LED 光的“显色性”。在相关系数为 0.587 的红-黄-蓝光照射下，干重和叶片生长速度是锐红蓝光的 2-3 倍。用于生菜生长的优化 LED 光可以假定为局限于 CIE 色度坐标中通过理想光的矢量之间的角度（约 75°）。这些发现为评估和寻找优化的植物生长 LED 光提供了一个新的思路。
