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Optimal Light Intensity for Lettuce Growth, Quality, and Photosynthesis in Plant Factories

文献类型： 外文期刊

作者： Dai, Mengdi 1 ; Tan, Xiangfeng 1 ; Ye, Ziran 1 ; Ren, Jianjie 2 ; Chen, Xuting 1 ; Kong, Dedong 1 ;

作者机构： 1.Zhejiang Acad Agr Sci, Inst Digital Agr, Hangzhou 310021, Peoples R China

2.Shangyu Agr Technol Extens Ctr, Shaoxing 312300, Peoples R China

关键词： plant phenotype; plant physiology; photosynthesis; LED light

期刊名称：PLANTS-BASEL （ 影响因子：4.1； 五年影响因子：4.5 ）

ISSN： 2223-7747

年卷期： 2024 年 13 卷 18 期

页码：

收录情况： SCI

摘要： In agriculture, one of the most crucial elements for sustained plant production is light. Artificial lighting can meet the specific light requirements of various plants. However, it is a challenge to find optimal lighting schemes that can facilitate a balance of plant growth and nutritional qualities. In this study, we experimented with the light intensity required for plant growth and nutrient elements. We designed three light intensity treatments, 180 mu mol m-2 s-1 (L1), 210 mu mol m-2 s-1 (L2), and 240 mu mol m-2 s-1 (L3), to investigate the effect of light intensity on lettuce growth and quality. It can be clearly seen from the radar charts that L2 significantly affected the plant height, fresh weight, dry weight, and leaf area. L3 mainly affected the canopy diameter and root shoot ratio. The effect of L1 on lettuce phenotype was not significant compared with that of the others. The total soluble sugar, vitamin C, nitrate, and free amino acid in lettuce showed more significant increases under the L2 treatment than under the other treatments. In addition, the transpiration rate and stomatal conductance were opposite to each other. The comprehensive evaluation of the membership function value method and heatmap analysis showed that lettuce had the highest membership function value in L2 light intensity conditions, indicating that the lettuce grown under this light intensity could obtain higher yield and better quality. This study provides a new insight into finding the best environmental factors to balance plant nutrition and growth.

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