A recent study from scientists at Ohio State University investigates the impact of (FR; 701 –750 nm) photons on leaf photosynthetic parameters in tomatoes, shedding light on how differences in the definition of photosynthetically active radiation influence the light compensation point (LCP).
The research examines changes of LCP with two definitions of photosynthetically active radiation (PAR: 400 –700 nm; ePAR: 400 – 750 nm) under two FR-to-ePAR ratios (2% and 44%) for both acclimatization and light response curve measurement light sources.
The findings highlight that different FR-to-ePAR ratio alter LCP as FR photons enhance photosynthesis in a synergetic manner with PAR photons. In addition, estimated LCP values differed depending on the definition of photosynthetically active radiation (either PAR or ePAR). These results indicate that inclusion of FR photons is essential for accurate estimation of LCP when the light environment of interest includes FR photons.
Dr. Changhyeon Kim, is Assistant professor at the University of Connecticut, formerly a postdoctoral scholar at Kubota lab at The Ohio State University. His research interests include understanding crop responses to varying environmental conditions, development of efficient management practices, the application of new technology to maximize economic feasibility of Controlled Environment Agriculture.
Dr. Chieri Kubota is Distinguished Professor at The Ohio State University. Her projects are in an interdisciplinary area that encompasses plant physiology and horticultural engineering to enhance understanding and efficiency of CEA plant production systems such as greenhouses, warehouses (vertical farms), and growth chamber.
The full article can be read on the ASHS HortTech electronic Journal website at the link here.
