Greater Than the Sum of the Parts: Revisiting the Enhancement Effect in Photosynthesis Using Simulated Sun- and Shade-Light.

ABSTRACT: Far-red light (FR) alone drives photosynthesis poorly, but when combined with shorter wavelengths it enhances photosynthesis beyond the sum of their individual effects-a phenomenon known as the Emerson enhancement effect. This effect is well-established for narrowband PAR-FR mixtures, and recent results show it also occurs within broadband "white" light, though the spectra investigated differed from those observed under natural conditions. In this study, we used simulated sun and foliar shade spectra (SUN and SHADE) during growth and measurements of mature tomato leaves to determine quantum yield for CO₂ assimilation (Φ_CO2) on an absorbed light basis under SUN and SHADE, 17 narrowband irradiances, and combinations of SUN or SHADE with the 17 narrowband irradiances. En

SUBMITTER: Taylor CR 

PROVIDER: S-EPMC12223708 | biostudies-literature | 2025 May

REPOSITORIES: biostudies-literature