Photosynthetica - Latest articles
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Contributions by Christa Critchley to photosynthesis research and to plant ecophysiology
G. GOVINDJEE
Photosynthetica 2024, 62(1):40-43 | DOI: 10.32615/ps.2024.011 
Christa Critchley is a distinguished researcher in basic and applied photosynthesis research. Her research has centered on the structure and function of chloroplasts and the application of chlorophyll a fluorescence to understanding the way PSII works. In her research, she used two biophysical tools, Nuclear Magnetic Resonance (NMR) and Chlorophyll (Chl) a fluorescence, as well as several other biochemical and plant physiological methods. Later in her career, she pioneered research in artificial photosynthesis (AP) focusing on the process of light-mediated water splitting and oxygen evolution. Here, only a glimpse of her life and some...
Heterocapsa cf. bohaiensis (dinoflagellate): identification and response to nickel and iron stress revealed through chlorophyll a fluorescence
V. MÉRIOT, A. ROUSSEL, N. BRUNET, N. CHOMERAT, G. BILIEN, L. LE DÉAN, V. BERTEAUX-LECELLIER, N. COULOMBIER, N. LEBOUVIER, T. JAUFFRAIS
Photosynthetica 2024, 62(1):27-39 | DOI: 10.32615/ps.2023.038
Metal toxicity in marine ecosystems is a growing issue owing to terrestrial runoff and anthropogenic pollution. Heterocapsa cf. bohaiensis, a newly isolated dinoflagellate from New Caledonia, was cultivated in photobioreactors operating continuously with high concentrations (10-3 M) of nickel (Ni2+) and/or iron (Fe2+) and their photosynthetic efficiency was assessed. The photosynthetic measurements indicated that H. cf. bohaiensis was tolerant to Ni2+ but sensitive to Fe2+ high concentrations. In the presence of Fe2+, maximum quantum efficiency...
Exogenous calcium-alleviating effect on sodium salt-induced phytotoxicity associated with changes in photosynthetic characteristics of wheat seedlings
Y. ZHANG, G.M. LIU, Z.F. WANG, A.M. ZHANG, Y.L. YANG
Photosynthetica 2024, 62(1):16-26 | DOI: 10.32615/ps.2023.039
To evaluate the Ca-alleviating effect on sodium salt-induced phytotoxicity, wheat (Triticum aestivum L.) cultivar Xihan 3 seedlings were treated with 150 mM NaCl, CaCl2 (0.1, 0.5, and 1 mM), Ca2+-channel blocker LaCl3, and/or Ca2+ chelator, ethylene glycol tetraacetic acid (EGTA) alone or in combination, to investigate seedling growth and photosynthetic characteristics. NaCl (150 mM) exposure alone suppressed a growth of seedling, weakened photosynthetic efficiency and chlorophyll (Chl) fluorescence parameters, reduced photosynthetic pigments, Ca2+ and calmodulin (CaM) contents, and downregulated...
Regulation of photosynthesis and water-use efficiency in pima and upland cotton species subjected to drought and recovery
J.M. HAN, J. FLEXAS, D.L. XIONG, J. GALMÉS, Y.L. ZHANG
Photosynthetica 2024, 62(1):6-15 | DOI: 10.32615/ps.2023.036
Photosynthesis is extremely sensitive to drought and decreases due to co-occurring stomatal, mesophyll, and biochemical limitations. Few studies have shown the effects of a drought cycle (drought-rewatering) on photosynthesis and water-use efficiency (WUE) in cotton. Here, the dynamics of photosynthesis in upland (Gossypium hirsutum) and pima (G. barbadense) cotton were analyzed during a drought cycle. While both species decreased net CO2 assimilation rate (PN) to a similar extent under drought, in pima cotton rewatering rapidly restored PN, the stomatal conductance (gs),...
HISTORY & BIOGRAPHY George Edward Hoch (1931–2023): a great photosynthesis scholar, a real family man, and a wonderful friend to many
G. GOVINDJEE
Photosynthetica 2024, 62(1):1-5 | DOI: 10.32615/ps.2024.001
We present here a tribute to George E. Hoch, one of the top leaders in deciphering the primary steps of oxygenic photosynthesis. After providing his academic background, we discuss his selected research on the photoreactions of photosynthesis. We end this tribute with reminiscences by Robert S. Knox, Jerome Kaye, and Doris Teichler-Zallen.