Photosynthetica, 2022 (vol. 60), issue 4
Improvement in the photoprotective capability benefits the productivity of a yellow-green wheat mutant in N-deficient conditions
X.H. ZHANG, H.X. LI, G. ZHUO, Z.Z. HE, C.Y. ZHANG, Z. SHI, C.C. LI, Y. WANG
Photosynthetica 2022, 60(4):476-488 | DOI: 10.32615/ps.2022.041 
Wheat yellow-green mutant Jimai5265yg has a more efficient photosynthetic system and higher productivity than its wild type under N-deficient conditions. To understand the relationship between photosynthetic properties and the grain yield, we conducted a field experiment under different N application levels. Compared to wild type, the Jimai5265yg flag leaves had higher mesophyll conductance, photosynthetic N-use efficiency, and photorespiration in the field without N application. Chlorophyll a fluorescence analysis showed that PSII was more sensitive to photoinhibition due to lower nonphotochemical quenching (NPQ) and higher nonregulated...
Detection of antibiotic and microplastic pollutants in Chrysanthemum coronarium L. based on chlorophyll fluorescence
M.Y. ZHONG, K.Y. KHAN, L.J. FU, Q. XIA, H. TANG, H.J. QU, S. YUAN, J.L. TAN, Y. GUO
Photosynthetica 2022, 60(4):489-496 | DOI: 10.32615/ps.2022.035
Large amounts of antibiotics and microplastics are used in daily life and agricultural production, which affects not only plant growth but also potentially the food safety of vegetables and other plant products. Fast detection of the presence of antibiotics and microplastics in leafy vegetables is of great interest to the public. In this work, a method was developed to detect sulfadiazine and polystyrene, commonly used antibiotics and microplastics, in vegetables by measuring and modeling photosystem II chlorophyll a fluorescence (ChlF) emission from leaves. Chrysanthemum coronarium L., a common beverage and medicinal plant, was used...
Effect of different LED-lighting quality conditions on growth and photosynthetic characteristics of saffron plants (Crocus sativus L.)
J. ZHU, Y.C. ZHANG, L.Y. YANG, L. ZHOU
Photosynthetica 2022, 60(4):497-507 | DOI: 10.32615/ps.2022.038
The effects of different light-emitting diode (LED) lights on saffron growth and photosynthetic characteristic were explored. Physiological mechanisms were explained by chlorophyll a fluorescence transient curves (OJIP) and JIP-test parameters. A decrease in the red to blue light ratio resulted in negative effects, particularly for monochromatic blue (B) LED light; saffron seedlings showed reduced chlorophyll accumulation, inhibited leaf elongation, and decreased photosynthetic performance. In the OJIP curve, the higher positive K-band observed for B LED light indicated that oxygen-evolving complex activation significantly decreased. B LED light...
Higher activity of PSI compared to PSII accounts for the beneficial effect of silicon on barley (Hordeum vulgare L.) plants challenged with salinity
M. FALOUTI, H. ELLOUZI, F. BOUNAOUARA, N. FARHAT, A.M. AGGAG, A. DEBEZ, M. RABHI, C. ABDELLY, I. SLAMA, W. ZORRIG
Photosynthetica 2022, 60(4):508-520 | DOI: 10.32615/ps.2022.031
This study was conducted to assess whether silicon (Si) supply can alleviate the harmful effects of severe salinity in barley (Hordeum vulgare). Plants were grown on non-saline (0 mM NaCl) or saline (200 mM NaCl) nutrient media supplemented or not with 0.5 mM Si. Salinity impacted plant morphology and induced sodium and chloride accumulation within plant tissues. It significantly affected almost all measured parameters. Interestingly, Si supply alleviated salt stress effects on plant morphology, growth (up to +59%), water status (up to +74%), membrane integrity (up to +35%), pigment contents (up to +121%), and the activity of the two photosystems...
Evidence of photosynthetic acclimation to self-shading in sugarcane canopies
R.L. ALMEIDA, N.M. SILVEIRA, M.T. MIRANDA, V.S. PACHECO, L.P. CRUZ, M.A. XAVIER, E.C. MACHADO, R.V. RIBEIRO
Photosynthetica 2022, 60(4):521-528 | DOI: 10.32615/ps.2022.045
Increasing the efficiency of photosynthesis in sugarcane canopies is the key for improving crop yield. Herein, we evaluated the photosynthetic performance along the canopy of ten sugarcane cultivars and three Saccharum species. Canopy morphological traits were evaluated, and leaf gas exchange was measured in the first (sun-exposed, +1) and the fourth (shaded, +4) fully expanded leaves and under low- and high-light conditions. Similar photosynthetic capacity was found in leaves +1 and +4 under high light in genotypes with a high leaf area index and a high fraction of the sky blocked by the foliage (> 85%). Interestingly, such canopy characteristics...
Evaluation of visible-light wavelengths that reduce or oxidize the plastoquinone pool in green algae with the activated F0 rise method
H. MATTILA, V. HAVURINNE, T. ANTAL, E. TYYSTJÄRVI
Photosynthetica 2022, 60(4):529-538 | DOI: 10.32615/ps.2022.049
We recently developed a chlorophyll a fluorescence method (activated F0 rise) for estimating if a light wavelength preferably excites PSI or PSII in plants. Here, the method was tested in green microalgae: Scenedesmus quadricauda, Scenedesmus ecornis, Scenedesmus fuscus, Chlamydomonas reinhardtii, Chlorella sorokiniana, and Ettlia oleoabundans. The Scenedesmus species displayed a plant-like action spectra of F0 rise, suggesting that PSII/PSI absorption ratio is conserved from higher plants to green algae. F0 rise was weak in a strain of C. reinhardtii,...
Photosynthetic responses of Eulophia dentata, Bletilla formosana, and Saccharum spontaneum under various photosynthetic photon flux density conditions
Y.-H. LAI, K.-H. LIN, C.-P. LIU, T.-S. LIAO, M.-Y. HUANG, C.-W. WANG, C.-I. CHEN
Photosynthetica 2022, 60(4):539-548 | DOI: 10.32615/ps.2022.050
This study aimed to determine the photosynthetic performance and differences in chlorophyll fluorescence (ChlF) parameters between Eulophia dentata and its companion species Bletilla formosana and Saccharum spontaneum when subjected to different photosynthetic photon flux density (PPFDs). Leaf surfaces were then illuminated with 50, 100 (low PPFDs), 300, 500, 800 (moderate PPFDs); 1,000; 1,500; and 2,000 (high PPFDs) μmol m-2.s-1, and the ChlF parameters were measured during the whole process. Increasing nonphotochemical quenching of ChlF and decreasing potential quantum efficiency of PSII, actual quantum...
Adaptive photosynthetic strategies of the invasive plant Sphagneticola trilobata and its hybrid to a low-light environment
W.Q. KE, Y.R. PAN, L.H. CHEN, J.D. HUANG, J.J. ZHANG, X.Y. LONG, M.L. CAI, C.L. PENG
Photosynthetica 2022, 60(4):549-561 | DOI: 10.32615/ps.2022.051
In stressful environments, invasive plants acclimate more efficiently than native plants and hybridization mainly contributes to this process. We examined changes in the morphological characteristics, photosynthetic characteristics, and antioxidant capacity of Sphagneticola trilobata and its hybrids in a low-light environment to explore their invasiveness, with Sphagneticola calendulacea serving as the control. The morphological plasticity of S. trilobata was not dominant, the maximal photochemical efficiency of PSII, actual quantum yield of PSII, and electron transport rate of PSⅡ increased and nonphotochemical quenching...
Happy birthday, Govindjee!
O. PRÁ©IL
Photosynthetica 2022, 60(4):562-563 | DOI: 10.32615/ps.2022.052
Congratulation to Govindjee on his 90th birthday