Pub Date : 2024-05-07eCollection Date: 2024-01-01DOI: 10.32615/ps.2024.018
E A Lysenko, V V Kusnetsov
We searched for a direct Cd action on the photosynthetic electron transport chain using induced chlorophyll fluorescence and P700 light absorption. Young barley and maize plants were treated with Cd in concentrations of toxic (80 μM) and nearly lethal (250 μM). The maximal and relative photochemical activities of PSI, its major limitation at the donor side, and partially acceptor-side limitation of PSII changed in agreement with Cd accumulation in the corresponding chloroplasts. Acceptor-side limitation of PSII increased with a direct Cd action at 80 μM that was overcome with an indirect Cd action at 250 μM. These alterations can be explained by Cd/Cu substitution in plastocyanin. The photochemical and nonphotochemical quenching by PSII varied diversely which cannot be explained unambiguously by any mechanism. The limitations of PSI [Y(ND), Y(NA)] and PSII (qC) were compared for the first time. They were ranged: Y(NA) < qC < Y(ND).
{"title":"Changes of Cd content in chloroplasts are mirrored by the activity of photosystem I, but not by photosystem II.","authors":"E A Lysenko, V V Kusnetsov","doi":"10.32615/ps.2024.018","DOIUrl":"10.32615/ps.2024.018","url":null,"abstract":"<p><p>We searched for a direct Cd action on the photosynthetic electron transport chain using induced chlorophyll fluorescence and P<sub>700</sub> light absorption. Young barley and maize plants were treated with Cd in concentrations of toxic (80 μM) and nearly lethal (250 μM). The maximal and relative photochemical activities of PSI, its major limitation at the donor side, and partially acceptor-side limitation of PSII changed in agreement with Cd accumulation in the corresponding chloroplasts. Acceptor-side limitation of PSII increased with a direct Cd action at 80 μM that was overcome with an indirect Cd action at 250 μM. These alterations can be explained by Cd/Cu substitution in plastocyanin. The photochemical and nonphotochemical quenching by PSII varied diversely which cannot be explained unambiguously by any mechanism. The limitations of PSI [Y<sub>(ND)</sub>, Y<sub>(NA)</sub>] and PSII (q<sub>C</sub>) were compared for the first time. They were ranged: Y<sub>(NA)</sub> < q<sub>C</sub> < Y<sub>(ND)</sub>.</p>","PeriodicalId":20157,"journal":{"name":"Photosynthetica","volume":"62 2","pages":"187-203"},"PeriodicalIF":2.1,"publicationDate":"2024-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11613828/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142801569","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
V. Mériot, A. Roussel, N. Brunet, N. Chomerat, G. Bilien, L. LE DÉAN, V. Berteaux-Lecellier, N. Coulombier, N. Lebouvier, T. Jauffrais
{"title":"Heterocapsa cf. bohaiensis (dinoflagellate): identification and response to nickel and iron stress revealed through chlorophyll a fluorescence","authors":"V. Mériot, A. Roussel, N. Brunet, N. Chomerat, G. Bilien, L. LE DÉAN, V. Berteaux-Lecellier, N. Coulombier, N. Lebouvier, T. Jauffrais","doi":"10.32615/ps.2023.038","DOIUrl":"https://doi.org/10.32615/ps.2023.038","url":null,"abstract":"","PeriodicalId":20157,"journal":{"name":"Photosynthetica","volume":"48 1","pages":""},"PeriodicalIF":2.7,"publicationDate":"2024-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139452865","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Monitoring the photosynthetic activity at single-cell level in Haematococcus lacustris","authors":"P. Patil, K. Nagy, Á. Ábrahám, I. Vass, M. Szabó","doi":"10.32615/ps.2023.042","DOIUrl":"https://doi.org/10.32615/ps.2023.042","url":null,"abstract":"","PeriodicalId":20157,"journal":{"name":"Photosynthetica","volume":"9 24","pages":""},"PeriodicalIF":2.7,"publicationDate":"2023-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138959972","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Microdomains heterogeneity in the thylakoid membrane proteins visualized by super-resolution microscopy","authors":"R. Kaňa, B. Šedivá, O. Prášil","doi":"10.32615/ps.2023.043","DOIUrl":"https://doi.org/10.32615/ps.2023.043","url":null,"abstract":"","PeriodicalId":20157,"journal":{"name":"Photosynthetica","volume":" 27","pages":""},"PeriodicalIF":2.7,"publicationDate":"2023-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138961729","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-12-19eCollection Date: 2023-01-01DOI: 10.32615/ps.2023.044
P H Lambrev, T Janda
{"title":"Editorial.","authors":"P H Lambrev, T Janda","doi":"10.32615/ps.2023.044","DOIUrl":"10.32615/ps.2023.044","url":null,"abstract":"","PeriodicalId":20157,"journal":{"name":"Photosynthetica","volume":"61 4","pages":"398-404"},"PeriodicalIF":2.1,"publicationDate":"2023-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11586841/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142794770","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
J. VUJIN, T. SZABÓ, R. PANAJOTOVIC, A.G. VÉGH, L. RINYU, L. NAGY
Photosynthetic reaction center (pRC) purified from Rhodobacter sphaeroides 2.4.1 purple bacteria was deposited on a graphene carrier exfoliated from the liquid phase and layered on the surface of SiO2/Si substrate for optoelectronic application. Light-induced changes in the drain-source current vs. gate voltage are demonstrated. Dried photosynthetic reaction centers/graphene composite on SiO2/Si shows a photochemical/-physical activity, as a result of interaction with the current flow in the graphene carrier matrix. The current changes are sensitive to light, due to the contribution from the charge separation in the pRC, and to the applied gate and drain-source voltages.
{"title":"Photosynthetic reaction center/graphene bio-hybrid for low-power optoelectronics","authors":"J. VUJIN, T. SZABÓ, R. PANAJOTOVIC, A.G. VÉGH, L. RINYU, L. NAGY","doi":"10.32615/ps.2023.041","DOIUrl":"https://doi.org/10.32615/ps.2023.041","url":null,"abstract":"Photosynthetic reaction center (pRC) purified from <i>Rhodobacter sphaeroides</i> 2.4.1 purple bacteria was deposited on a graphene carrier exfoliated from the liquid phase and layered on the surface of SiO<sub>2</sub>/Si substrate for optoelectronic application. Light-induced changes in the drain-source current <i>vs</i>. gate voltage are demonstrated. Dried photosynthetic reaction centers/graphene composite on SiO<sub>2</sub>/Si shows a photochemical/-physical activity, as a result of interaction with the current flow in the graphene carrier matrix. The current changes are sensitive to light, due to the contribution from the charge separation in the pRC, and to the applied gate and drain-source voltages.","PeriodicalId":20157,"journal":{"name":"Photosynthetica","volume":"120 32","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135137723","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Y. ZHANG, G.M. LIU, Z.F. WANG, A.M. ZHANG, Y.L. YANG
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 TaCaM expression in wheat leaves. The opposite changes of these parameters were caused by 0.5 or 1 mM CaCl2 treatments alone. Moreover, 0.5 or 1 mM CaCl2 application effectively alleviated sodium salt-induced changes of these parameters, which was blocked by LaCl3 or EGTA. Therefore, exogenous Ca presence effectively promoted the growth of NaCl-stressed wheat seedlings through the enhancement of photosynthesis and Chl synthesis mediated by the Ca-CaM signal.
为评价小麦(Triticum aestivum L.)西寒3号(Triticum aestivum L.)幼苗在150 mM NaCl、CaCl2(0.1、0.5和1 mM)、Ca2+通道阻滞剂LaCl3和/或Ca2+螯合剂乙二醇四乙酸(EGTA)单独或联合处理下对钠盐诱导的植物毒性的缓解作用，研究幼苗的生长和光合特性。单独NaCl (150 mM)处理抑制了小麦幼苗的生长，降低了光合效率和叶绿素荧光参数，降低了光合色素、Ca2+和钙调素(CaM)含量，下调了叶片中TaCaM的表达。单独处理0.5 mM或1 mM CaCl2会引起这些参数相反的变化。此外，0.5或1 mM CaCl2可有效缓解钠盐引起的这些参数的变化，而这些变化被LaCl3或EGTA阻断。因此，外源Ca的存在通过Ca- cam信号介导的光合作用和Chl合成的增强，有效促进了nacl胁迫下小麦幼苗的生长。
{"title":"Exogenous calcium-alleviating effect on sodium salt-induced phytotoxicity associated with changes in photosynthetic characteristics of wheat seedlings","authors":"Y. ZHANG, G.M. LIU, Z.F. WANG, A.M. ZHANG, Y.L. YANG","doi":"10.32615/ps.2023.039","DOIUrl":"https://doi.org/10.32615/ps.2023.039","url":null,"abstract":"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 TaCaM expression in wheat leaves. The opposite changes of these parameters were caused by 0.5 or 1 mM CaCl2 treatments alone. Moreover, 0.5 or 1 mM CaCl2 application effectively alleviated sodium salt-induced changes of these parameters, which was blocked by LaCl3 or EGTA. Therefore, exogenous Ca presence effectively promoted the growth of NaCl-stressed wheat seedlings through the enhancement of photosynthesis and Chl synthesis mediated by the Ca-CaM signal.","PeriodicalId":20157,"journal":{"name":"Photosynthetica","volume":"16 7","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135634143","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"In appreciation of an ingenious scientist and a great friend: Győző Garab","authors":"G. GOVINDJEE","doi":"10.32615/ps.2023.040","DOIUrl":"https://doi.org/10.32615/ps.2023.040","url":null,"abstract":"","PeriodicalId":20157,"journal":{"name":"Photosynthetica","volume":"21 2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135368332","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
J.M. HAN, J. FLEXAS, D.L. XIONG, J. GALMÉS, Y.L. ZHANG
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), the maximum carboxylation rate (Vcmax), and the maximum electron transport rate above the control level. Meanwhile, the response of leaf intrinsic WUE (WUEi) to drought and recovery was different between the two cotton species, which was mainly co-regulated by Vcmax and gs. In conclusion, pima and upland cotton exhibit different response patterns of PN and WUEi during the whole process of drought and recovery.
{"title":"Regulation of photosynthesis and water-use efficiency in pima and upland cotton species subjected to drought and recovery","authors":"J.M. HAN, J. FLEXAS, D.L. XIONG, J. GALMÉS, Y.L. ZHANG","doi":"10.32615/ps.2023.036","DOIUrl":"https://doi.org/10.32615/ps.2023.036","url":null,"abstract":"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 (<i>Gossypium hirsutum</i>) and pima (<i>G. barbadense</i>) cotton were analyzed during a drought cycle. While both species decreased net CO<sub>2</sub> assimilation rate (<i>P</i><sub>N</sub>) to a similar extent under drought, in pima cotton rewatering rapidly restored <i>P</i><sub>N</sub>, the stomatal conductance (<i>g</i><sub>s</sub>), the maximum carboxylation rate (<i>V</i><sub>cmax</sub>), and the maximum electron transport rate above the control level. Meanwhile, the response of leaf intrinsic WUE (WUE<sub>i</sub>) to drought and recovery was different between the two cotton species, which was mainly co-regulated by <i>V</i><sub>cmax</sub> and <i>g</i><sub>s</sub>. In conclusion, pima and upland cotton exhibit different response patterns of <i>P</i><sub>N</sub> and WUE<sub>i</sub> during the whole process of drought and recovery.","PeriodicalId":20157,"journal":{"name":"Photosynthetica","volume":"67 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135730357","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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.
我们在此向George E. Hoch致敬，他是破译含氧光合作用基本步骤的顶尖领导者之一。在介绍了他的学术背景后，我们讨论了他在光合作用光反应方面的研究。我们以Robert S. Knox, Jerome Kaye和Doris Teichler-Zallen的回忆来结束这篇致敬。
{"title":"HISTORY & BIOGRAPHY George Edward Hoch (1931-2023): a great photosynthesis scholar, a real family man, and a wonderful friend to many","authors":"G. GOVINDJEE","doi":"10.32615/ps.2024.001","DOIUrl":"https://doi.org/10.32615/ps.2024.001","url":null,"abstract":"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.","PeriodicalId":20157,"journal":{"name":"Photosynthetica","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135731782","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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