PJB-2017-765
The effect of different spectral LED lights on the phenotypic and physiological characteristics of lettuce (Lactuca sativa) at picking stage
tao zhang
Abstract
Light plays crucial roles in plant morphological and physiological processes. In this study, lettuce plants (Lactuca sativa L.) were exposed to different spectral LED lights for 16 h⋅d-1 photoperiod under the following eight treatments: white light (W, the control), monochromatic red light (R), monochromatic blue light (B), monochromatic green light (G), monochromatic yellow light (Y), monochromatic purple light (P) and a combination of R and B with R/B ratios of 9/1 and 4/1. Lettuce phenotype and some quality related indices were significantly changed under different LED lights. The vitamin C content of lettuce was increased under most of different light treatments, while the anthocyanin content was significantly increased only under G LED light treatment. In addition, R/B (4/1) increased soluble sugar and protein content and R and B combinations particularly R/B (4/1) improved phenotypic characteristics including plant height, stem diameter, fresh weight above ground, Soil and Plant Analyzer Development (SPAD). These results suggested R/B (4/1) could efficiently improve the lettuce quality which will provide valuable information for optimizing the conditions of lettuce production in the plant factory setting.
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