Just Accepted
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Accelerating soybean leaf growth and stem strength by using natural sunny day light parameter characteristics
Abstract
The ratios of red light (R)/blue light (B) and R/far-red light (Fr) stay relatively constant which is the unique properties of sunlight. It may be a new way to optimize plant development in artificial lighting conditions. We assayed the potential effects of white light (W), 50% R 50% B (RB), and the unique properties of sunlight (N, R/Fr=1.4, R/Fr=1.1) under 500 μmol m−2 s−1 on soybean plant growth. The results showed that total leaf dry weight under N rapidly increased compared with those of the W and RB treatments from 30 d to 60 d. Soybean plants under N treatment had higher Rubisco activity and chlorophyll content than those of W treatment at 50 d. Stem and petiole dry weight under N treatment grew by 454.3% from 30-60 d. Compared with W and RB treatments, lignin content in the stems was also 26.9% and 34.5% higher at 50 d under N treatment, respectively. N treatment caused 22.9% and 26.2% higher cellulose content than W and RB treatments at 50 d, respectively. N treatment led to 10.5% higher 13C assimilation than RB treatment in stems. The spectral combination of sunlight enhanced soybean plant growth and stem strength in artificial light environment.
FP25111 Accepted 19 June 2025
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