Li Lie, Sugita Ryusei, Yamaguchi Kampei, Togawa Hiroyuki, Terashima Ichiro, Yamori Wataru
Institute for Sustainable Agro-ecosystem Services, The University of Tokyo, Nishitokyo, Japan.
Research & Development Division, Stanley Electric Co., Ltd., Hatano, Japan.
Front Plant Sci. 2025 May 20;16:1589279. doi: 10.3389/fpls.2025.1589279. eCollection 2025.
The optimization of plant productivity in indoor horticulture relies heavily on artificial light systems, which serve as the primary light source for plant growth. Although light-emitting diodes (LEDs) have been extensively studied in recent decades, there is limited research on laser diodes (LDs). LDs offer several advantages, including single-wavelength coherent light, remote illumination via optical fibers that minimizes heat accumulation at the canopy level, a compact and lightweight design, and enhanced energy efficiency at high input current densities. This study investigated the impact of red LD light on plant photosynthesis and growth, exploring its potential applications in indoor horticulture. The research examined the gas exchange of tobacco plants ( L. cv. Wisconsin-38) under six red LED and LD light sources with varying spectral characteristics. Two specific light sources were selected for further study: LED 664 (emission peak at 664 nm, waveband of 625678 nm) and LD 660 (emission peak at 660 nm, waveband of 657664 nm) as they demonstrated the greatest gas exchange efficiency among the tested LED and LD light sources. These two light sources were then evaluated for their effects on photochemical efficiency, carbohydrate accumulation and plant growth. The present study showed that compared with LED 664, LD 660 significantly increased Y(II), qL, and starch accumulation in tobacco leaves. Additionally, after 12 d of continuous irradiation with LD 660, tobacco and Arabidopsis plants exhibited increased photosynthetic capacity. Furthermore, all three investigated species, tobacco, Arabidopsis, and lettuce, showed greater shoot dry weights and leaf areas compared to those under LED 664. These findings suggest that LDs present significant advantages over LEDs for indoor plant production.
室内园艺中植物生产力的优化在很大程度上依赖于人工照明系统，该系统是植物生长的主要光源。尽管发光二极管（LED）在近几十年中已得到广泛研究，但对激光二极管（LD）的研究却很有限。LD具有多种优势，包括单波长相干光、通过光纤进行远程照明，可将冠层水平的热量积累降至最低、紧凑轻便的设计以及在高输入电流密度下提高能源效率。本研究调查了红色LD光对植物光合作用和生长的影响，探索其在室内园艺中的潜在应用。该研究考察了六种具有不同光谱特性的红色LED和LD光源下烟草植株（L. cv. Wisconsin-38）的气体交换情况。选择了两种特定光源进行进一步研究：LED 664（发射峰在664nm，波段为625678nm）和LD 660（发射峰在660nm，波段为657664nm），因为它们在测试的LED和LD光源中表现出最大的气体交换效率。然后评估了这两种光源对光化学效率、碳水化合物积累和植物生长的影响。本研究表明，与LED 664相比，LD 660显著提高了烟草叶片的Y(II)、qL和淀粉积累。此外，用LD 660连续照射12天后，烟草和拟南芥植株的光合能力增强。此外，与LED 664下的情况相比，所研究的三种植物——烟草、拟南芥和生菜，其地上部干重和叶面积均更大。这些发现表明，在室内植物生产方面，LD比LED具有显著优势。
