Li Jiawei, Li Yuanyuan, Chen Yunke, Xu Shipu, Wu Xue, Wu Cuinan, Zhang Ningyi, Cao Kai
School of Agricultural Engineering, Jiangsu University, Zhenjiang, Jiangsu, China.
Key Laboratory of Agricultural Engineering in the Middle and Lower Reaches of Yangtze River, Ministry of Agriculture, Institute of Agricultural Facilities and Equipment, Jiangsu Academy of Agricultural Sciences, Nanjing, Jiangsu, China.
Front Plant Sci. 2024 Nov 29;15:1492431. doi: 10.3389/fpls.2024.1492431. eCollection 2024.
In vertical farms, the supplementation of far-red light has been widely applied to regulate plant growth and development. However, the relative contribution of far-red to photosynthesis and plant growth in indoor production systems is not sufficiently quantified. This study quantify the photosynthesis and growth responses under different levels of supplemental far-red in lettuce using a 3D modelling approach. Lettuce were cultivated under either white light or red to far-red (R:FR) ratio of 1.6 or 0.8. Measurements of plant morphological traits, leaf photosynthesis, and organ fresh and dry mass were taken and the 3D modelling approach was used to simulate plant photosynthesis and biomass accumulation. Results showed that leaf elevation angle, leaf expansion rate, and plant height significantly increased at each growth stage as the R:FR ratio decreased. Far-red light also promoted plant growth, leading to an increase in the dry and fresh weight of lettuce throughout the entire growth period. However, plants cultivated at low R:FR showed reduced maximum Rubisco carboxylation rate and maximum electron transport rate, which indicated that far-red light reduced the photosynthetic capacity in lettuce. Nevertheless, 3D model simulations demonstrated that plants exposed to enhanced far-red light exhibited increased light interception and whole-plant photosynthesis. The integrated analysis of photosynthetic parameters and plant morphological changes on the photosynthetic rate of the whole plant indicated that the positive effects of plant morphological changes outweighed the negative impacts of photosynthetic parameters. These results implied that far-red light-induced morphological changes enhanced light interception and whole-plant photosynthesis, thereby increased lettuce yield.
在垂直农场中，远红光的补充已被广泛应用于调节植物的生长发育。然而，在室内生产系统中，远红光对光合作用和植物生长的相对贡献尚未得到充分量化。本研究采用三维建模方法，量化了生菜在不同水平补充远红光下的光合作用和生长响应。生菜在白光或红/远红（R:FR）比值为1.6或0.8的条件下栽培。测量了植物的形态特征、叶片光合作用以及器官的鲜重和干重，并使用三维建模方法模拟了植物的光合作用和生物量积累。结果表明，随着R:FR比值的降低，每个生长阶段的叶片仰角、叶片扩展速率和株高均显著增加。远红光也促进了植物生长，导致生菜在整个生长周期内的干重和鲜重增加。然而，在低R:FR条件下栽培的植物显示出最大Rubisco羧化速率和最大电子传递速率降低，这表明远红光降低了生菜的光合能力。尽管如此，三维模型模拟表明，暴露于增强远红光下的植物表现出光截获和整株光合作用增加。对光合参数和植物形态变化对整株光合速率的综合分析表明，植物形态变化的积极影响超过了光合参数的负面影响。这些结果表明，远红光诱导的形态变化增强了光截获和整株光合作用，从而提高了生菜产量。
