Cultivated soybean is a globally important crop; understanding its responses to different light spectra within the canopy is essential, especially considering the limited agricultural area. Energy flux and spectral quality are key components of the light environment that determine photosynthesis and, consequently, plant growth. These factors influence the composition and structure of photosystem II, thereby affecting energy partitioning between photochemical and nonphotochemical processes. This study evaluated the photosynthetic performance of two soybean genotypes under four light environments with distinct spectral compositions but equal energy flux. Results showed that PSII efficiency improved by the wavelengths outside the PAR range, irrespective of genotype. However, quantum yield parameters revealed genotype-specific responses under blue and red light. Plants exposed exclusively to red light exhibited reduced photosynthetic efficiency and increased photodamage after prolonged exposure, consistent with red light syndrome.

Biochemistry Laboratory Department of Plant Biology Faculty of Agronomy Universidad de la República Garzón 809 Montevideo Uruguay

Department of Crop Sciences University of Illinois Urbana Illinois USA

Faculty of Engineering Institute of Electrical Engineering Universidad de la República Julio Herrera y Reissig 565 Montevideo Uruguay

Instituto Nacional de Investigación Agropecuaria Plant Genetic Improvement and Biotechnology Area Wilson Ferreira Aldunate Experimental Station Ruta 48 Km 10 Rincón del Colorado 90200 Canelones Uruguay

Mathematics Area Faculty of Exact and Natural Sciences Universidad Nacional de Cuyo Padre Contreras 1300 Mendoza Argentina

Photobiology Laboratory Department of Plant Biology Faculty of Agronomy Universidad de la República Garzón 809 Montevideo Uruguay

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