Photosynthetica - Ahead of Print
Spectral light quality differentially modulates PSII energy partitioning among soybean genotypes
M. MARTÍNEZ-MORÉ, S. SIMONDI, M.M. SAINZ, V. BONNECARRÈRE, S. FERNÁNDEZ, G. QUERO
Photosynthetica X:X | DOI: 10.32615/ps.2025.029 
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....
Characterizing the CO2-response curve in photosynthesis and photorespiration: an innovative model for C3 plant species
H.-J. KANG, T. AN, X.-L. YANG, Z.-P. YE, F.-B. WANG
Photosynthetica X:X | DOI: 10.32615/ps.2025.030
We introduce a novel model for characterizing the CO₂-response curve in photosynthesis, addressing the limitations of the Farquhar-von Caemmerer-Berry (FvCB) model by providing a more comprehensive framework for understanding photosynthetic responses to varying CO2 concentrations in C3 plants. The FvCB model, while instrumental in interpreting the photosynthetic response to CO2, does not directly estimate critical parameters such as maximum net photosynthetic rate, transit point from RuBP- to TPU-limited photosynthesis, and the CO2 compensation point in the presence of day respiration (Rday)....
Additional far-red light improves the growth and resistance of the photosynthetic apparatus of Lactuca sativa L. to high-intensity light
V.D. KRESLAVSKI, P.P. PASHKOVSKIY, A.N. SHMAREV, A.Yu. KHUDYAKOVA, V.V. STROKINA, A.A. IVANOV, A.A. KOSOBRYUKHOV, S.I. ALLAKHVERDIEV
Photosynthetica X:X | DOI: 10.32615/ps.2025.032
The effects of additional far-red light (FRL) on the growth parameters, photosynthetic activity, and pro- or antioxidant balance of Lactuca sativa L. plants grown for 30 d were studied. The plants were grown under white light-emitting diodes with equal PAR intensities at red/far-red light ratios of 0.29, 0.89, and 1.67 and without FRL. Compared to the absence of the FRL, growth at a 0.29 ratio caused an increase in plant biomass and leaf area, but a decrease in PSII activity, net photosynthetic rate (PN) per unit area, and stomatal conductance. High irradiance for 4 h at 1,000 μmol(photon) m-2 s-1...
Gordon Research Conference on Photosynthesis 2025: Mechanisms of the Process Driving the Biosphere Through the Lenses of Experiment and Computation
C.J. GISRIEL, J. LIU, D.A. FLESHER, K.E. REDDING
Photosynthetica X:X | DOI: 10.32615/ps.2025.033
Herein, we report on the 2025 Gordon Research Conference (27 July-1 August) and its preceding Gordon Research Seminar (26-27 July) on Photosynthesis, entitled "Mechanisms of the Process Driving the Biosphere Through the Lenses of Experiment and Computation". Both were held at Sunday River Resort in Newry, Maine, USA. The seminar and conference brought together an international group of photosynthesis researchers to discuss the most cutting-edge work uncovering photosynthetic mechanisms via computation, genetic manipulation, systems biology, structural biology, and much more.
Unravelling the differential responses of critically endangered Onobrychis conferta populations to drought and salinity stress
A. SAKHRAOUI, H.B. LTAEIF, J.M. CASTILLO, S. ROUZ
Photosynthetica X:X | DOI: 10.32615/ps.2025.034
Understanding stress responses of endangered plants is vital for their conservation under climate change. We examined the effects of iso-osmotic drought (PEG) and salinity (NaCl) on the growth and physiology of three populations of the critically endangered legume Onobrychis conferta subsp. conferta (OC1, OC2, OC3) endemic to North-Western Tunisia. Both stresses reduced photosynthesis, stomatal conductance, intercellular CO2, and carboxylation efficiency, while increasing intrinsic water-use efficiency. PSII photoinhibition (Fv/Fm decline) occurred after 6 d. Prolonged stress suppressed growth and water...
Increase in photosynthetic carbon assimilation and gas exchange through foliar application of melatonin in green bean plants
C.A. RAMÍREZ-ESTRADA, E.H. OCHOA-CHAPARRO, E. NAVARRO-LEÓN, J.C. ANCHONDO-PAÉZ, J.J. PATIÑO-CRUZ, C.L. FRANCO-LAGOS, A. ALVAREZ-MONGE, E. SÁNCHEZ
Photosynthetica X:X | DOI: 10.32615/ps.2025.036
Crop productivity depends largely on photosynthetic efficiency, which is key to converting light energy into assimilates for biomass accumulation. The use of biostimulants such as melatonin (MEL) has emerged as a sustainable alternative to improve internal processes in plants and increase production. However, its effect on beans has not yet been clearly described. This study evaluated the foliar application of MEL on physiological and productive variables of Strike beans (Phaseolus vulgaris L.). The plants were grown in vermiculite/perlite substrate (2:1) for 60 d, applying MEL [0, 1, 10, and 100 µM] weekly from 15 d after sowing. All...