Photosynthetica最新文献

Determination of rice (Oryza sativa L.) drought stress levels based on chlorophyll a fluorescence through independent component analysis. 基于独立成分分析的叶绿素a荧光测定水稻干旱胁迫水平

IF 2.1 4区生物学

Photosynthetica Pub Date : 2025-03-27 eCollection Date: 2025-01-01 DOI: 10.32615/ps.2025.009

Q Xia, H Tang, J L Tan, S I Allakhverdiev, Y Guo

{"title":"Determination of rice (Oryza sativa L.) drought stress levels based on chlorophyll a fluorescence through independent component analysis.","authors":"Q Xia, H Tang, J L Tan, S I Allakhverdiev, Y Guo","doi":"10.32615/ps.2025.009","DOIUrl":"https://doi.org/10.32615/ps.2025.009","url":null,"abstract":"Sensing rice drought stress is crucial for agriculture, and chlorophyll a fluorescence (ChlF) is often used. However, existing techniques usually rely on defined feature points on the OJIP induction curve, which ignores the rich physiological information in the entire curve. Independent Component Analysis (ICA) can effectively preserve independent features, making it suitable for capturing drought-induced physiological changes. This study applies ICA and Support Vector Machine (SVM) to classify drought levels using the entire OJIP curve. The results show that the 20-dimensional ChlF features obtained by ICA provide superior classification performance, with Accuracy, Precision, Recall, F1-score, and Kappa coefficient improving by 18.15%, 0.18, 0.17, 0.17, and 0.22, respectively, compared to the entire curve. This work provides a rice drought stress levels determination method and highlights the importance of applying dimension reduction methods for ChlF analysis. This work is expected to enhance stress detection using ChlF.","PeriodicalId":20157,"journal":{"name":"Photosynthetica","volume":"63 1","pages":"73-80"},"PeriodicalIF":2.1,"publicationDate":"2025-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12012420/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144035493","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}

引用次数: 0

Subtropical lichens from the Afromontane can display rapid photosynthetic acclimation to simulated climate change. 来自非洲山区的亚热带地衣对模拟气候变化表现出快速的光合适应。

IF 2.1 4区生物学

Photosynthetica Pub Date : 2025-03-14 eCollection Date: 2025-01-01 DOI: 10.32615/ps.2025.005

N T Ndhlovu, T N Khuzwayo, F V Minibayeva, R P Beckett

{"title":"Subtropical lichens from the Afromontane can display rapid photosynthetic acclimation to simulated climate change.","authors":"N T Ndhlovu, T N Khuzwayo, F V Minibayeva, R P Beckett","doi":"10.32615/ps.2025.005","DOIUrl":"https://doi.org/10.32615/ps.2025.005","url":null,"abstract":"Afromontane forests are an important part of the KwaZulu Natal region of southern Africa, having a distinctive flora with a high proportion of endemic species, and lichens are keystone members. Unlike other continental areas, KwaZulu Natal climate change is predicted to increase rainfall and cloudiness. In the present study, hydrated Afromontane lichens from both exposed and shaded microhabitats were given either constant [100 µmol(photon) m-2 s-1] or fluctuating [0, 200, 0 µmol(photon) m-2 s-1] light for 8 h a day for 3 d and changes monitored in nonphotochemical quenching (NPQ) and rates of photosynthetic electron transport. In sun but not shade collections, NPQ strongly increased following treatment with constant and fluctuating light. It seems likely that CO2 fixation may be reduced in moist thalli, and the increase in NPQ may reduce ROS formation during exposure to light while hydrated. Sun lichens can readily modify their NPQ in response to increased cloudiness and rainfall expected in KwaZulu Natal.","PeriodicalId":20157,"journal":{"name":"Photosynthetica","volume":"63 1","pages":"64-72"},"PeriodicalIF":2.1,"publicationDate":"2025-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12012427/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144024014","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}

引用次数: 0

Response of leaf internal CO₂ concentration and intrinsic water-use efficiency in Norway spruce to century-long gradual CO₂ elevation. 挪威云杉叶片内部CO2浓度和内在水分利用效率对百年CO2逐渐升高的响应

IF 2.1 4区生物学

Photosynthetica Pub Date : 2025-03-13 eCollection Date: 2025-01-01 DOI: 10.32615/ps.2025.006

J Šantrůček, J Kubásek, J Janová, H ŠantrůčKOvá, J Altman, J Tumajer, M Hrádková, E Cienciala

{"title":"Response of leaf internal CO2 concentration and intrinsic water-use efficiency in Norway spruce to century-long gradual CO2 elevation.","authors":"J Šantrůček, J Kubásek, J Janová, H ŠantrůčKOvá, J Altman, J Tumajer, M Hrádková, E Cienciala","doi":"10.32615/ps.2025.006","DOIUrl":"https://doi.org/10.32615/ps.2025.006","url":null,"abstract":"The strategies of Norway spruce [Picea abies (L.) Karst.] to increasing atmospheric CO2 concentration (C a) are not entirely clear. Here, we reconstructed centennial trajectories of leaf internal CO2 concentration (C i) and intrinsic water-use efficiency (WUEi) from the amount of 13C in tree-ring cellulose. We collected 57 cores across elevations, soil, and atmospheric conditions in central Europe. Generally, WUEi and C i increased over the last 100 years and the C i/C a ratio remained almost constant. However, two groups were distinguished. The first group showed a quasi-linear response to C a and the sensitivity of C i to C a (s = dC i/dC a) ranged from 0 to 1. Trees in the second group showed nonmonotonic responses with extremes during the peak of industrial air pollution in the 1980s and s increase from -1 to +1.6. Our study shows a marked attenuation of the rise in WUEi during the 20th century leading to invariant WUEi in recent decades.","PeriodicalId":20157,"journal":{"name":"Photosynthetica","volume":"63 1","pages":"51-63"},"PeriodicalIF":2.1,"publicationDate":"2025-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12012425/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144064539","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}

引用次数: 0

Heat-induced F₀-fluorescence rise is not an indicator of severe tissue necrosis in thermotolerance assays of young and mature leaves of a tropical tree species, Calophyllum inophyllum. 在热带树种Calophyllum inophyllum的幼叶和成熟叶的耐热性试验中，热诱导的f0荧光上升不是严重组织坏死的指标。

IF 2.1 4区生物学

Photosynthetica Pub Date : 2025-02-27 eCollection Date: 2025-01-01 DOI: 10.32615/ps.2025.004

K Winter, M Garcia, A Virgo

{"title":"Heat-induced F0-fluorescence rise is not an indicator of severe tissue necrosis in thermotolerance assays of young and mature leaves of a tropical tree species, Calophyllum inophyllum.","authors":"K Winter, M Garcia, A Virgo","doi":"10.32615/ps.2025.004","DOIUrl":"https://doi.org/10.32615/ps.2025.004","url":null,"abstract":"In heating experiments with leaves, the temperature at which dark-level F0 chlorophyll a fluorescence begins to rise, Tcrit, is widely used as an indicator of photosystem II thermotolerance. However, little is known about how Tcrit correlates with irreversible leaf tissue damage. Young and mature leaves of the tropical tree species Calophyllum inophyllum were heated stepwise from 30 to 55°C, at 1°C min-1. Tcrit was 47°C in young leaves and 49°C in mature leaves. Contrary to the higher Tcrit in mature leaves, heating to 55°C elicited greater tissue damage in mature than in young leaves. Young and mature leaves heated to their respective Tcrit or Tcrit + 2°C exhibited no or little tissue necrosis after 14 d of post-culture. It is concluded that measurements of the temperature-dependent F0 fluorescence rise underestimate the thermal thresholds above which significant irreversible leaf damage occurs.","PeriodicalId":20157,"journal":{"name":"Photosynthetica","volume":"63 1","pages":"46-50"},"PeriodicalIF":2.1,"publicationDate":"2025-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12012419/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144064538","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}

引用次数: 0

Relative importance of chlorophyll metabolic genes for light-induced greening of potato tubers. 叶绿素代谢基因在马铃薯块茎光诱导变绿中的相对重要性。

IF 2.1 4区生物学

Photosynthetica Pub Date : 2025-02-13 eCollection Date: 2025-01-01 DOI: 10.32615/ps.2025.003

S Tanios, T Thangavel, A Eyles, R S Tegg, C R Wilson

{"title":"Relative importance of chlorophyll metabolic genes for light-induced greening of potato tubers.","authors":"S Tanios, T Thangavel, A Eyles, R S Tegg, C R Wilson","doi":"10.32615/ps.2025.003","DOIUrl":"https://doi.org/10.32615/ps.2025.003","url":null,"abstract":"Potato tuber greening occurs due to the chlorophyll accumulation upon exposure to light, however, fundamental information on tuber chlorophyll metabolism is lacking. We measured the effect of varying light exposure (0, 48, 96, and 168 h) on chlorophyll concentration and gene expression of enzymes in the chlorophyll metabolic pathway in the potato varieties that differ in greening propensity. Greening was associated with the upregulation of genes involved in chlorophyll biosynthesis, particularly glutamyl-tRNA reductase 1, magnesium-chelatase subunit H, and magnesium-protoporphyrin IX monomethyl ester cyclase, and downregulation of genes involved in chlorophyll cycling and degradation, including chlorophyllide a oxygenase, and pheophorbide a oxygenase. Our findings suggest that relative resistance to tuber greening propensity may be due to a weaker upregulation of chlorophyll biosynthesis genes and weaker downregulation of chlorophyll degradation genes that occurs in susceptible varieties. The association of these biosynthesis and degradation genes with greening susceptibility may provide possible breeding targets for the future development of more greening-resistant varieties.","PeriodicalId":20157,"journal":{"name":"Photosynthetica","volume":"63 1","pages":"37-45"},"PeriodicalIF":2.1,"publicationDate":"2025-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12012421/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144038067","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}

引用次数: 0

Hans Kautsky's groundbreaking discovery(ies) in 1931, its scientific environment, and the ensuing developments. 汉斯·考茨基在1931年的突破性发现，它的科学环境，以及随后的发展。

IF 2.1 4区生物学

Photosynthetica Pub Date : 2025-02-10 eCollection Date: 2025-01-01 DOI: 10.32615/ps.2025.007

U Schreiber, H K Lichtenthaler

{"title":"Hans Kautsky's groundbreaking discovery(ies) in 1931, its scientific environment, and the ensuing developments.","authors":"U Schreiber, H K Lichtenthaler","doi":"10.32615/ps.2025.007","DOIUrl":"https://doi.org/10.32615/ps.2025.007","url":null,"abstract":"In 1931, Hans Kautsky discovered not only chlorophyll (Chl) fluorescence induction (\"Kautsky effect\") in green leaves but also metastable excited oxygen, now known as singlet oxygen, which he showed to act as an intermediate in dye-sensitized photooxidations of organic substances in vitro (\"Kautsky mechanism\"). While at that time practically nothing was known about the primary reactions of photosynthesis, Kautsky firmly believed that \"his\" mechanism is also effective in the \"Chl-sensitized\" conversion of light energy into chemically fixed energy. This erroneous assumption complicated the interpretation of rapid Chl fluorescence induction kinetics, particularly those measured by his student Ulrich Franck in his 1941 dissertation, part of which indicated the existence of two excitonically separated light reactions. This historical note deals with the essence of Kautsky's two discoveries, the scientific environment under which they took place, and the question of why mainstream photosynthesis researchers have largely ignored the ensuing detailed experimental work of Ulrich Franck. The first commented English version of Kautsky and Hirsch (1931) is presented in the Appendix.","PeriodicalId":20157,"journal":{"name":"Photosynthetica","volume":"63 1","pages":"28-36"},"PeriodicalIF":2.1,"publicationDate":"2025-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12012422/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144028525","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}

引用次数: 0

The story of my life into and through the science of photosynthesis: a personal perspective. 我与光合作用科学的故事：个人视角。

IF 2.1 4区生物学

Photosynthetica Pub Date : 2025-01-31 eCollection Date: 2025-01-01 DOI: 10.32615/ps.2025.001

J J S Van Rensen

引用次数: 0

Sixty years of research on photosynthesis: a personal scientific autobiography. 光合作用研究六十年：个人科学自传。

IF 2.1 4区生物学

Photosynthetica Pub Date : 2025-01-30 eCollection Date: 2025-01-01 DOI: 10.32615/ps.2025.002

T Ogawa

引用次数: 0

The resistance of Solanum lycopersicum photosynthetic apparatus to high-intensity blue light is determined mainly by the cryptochrome 1 content. 茄光合机构对强蓝光的抗性主要由隐色素1含量决定。

IF 2.1 4区生物学

Photosynthetica Pub Date : 2025-01-17 eCollection Date: 2025-01-01 DOI: 10.32615/ps.2024.043

V Kreslavski, P Pashkovskiy, A Ashikhmin, A Kosobryukhov, A Shmarev, A Ivanov, V Strokina, M Vereshchagin, G Shirshikova, S I Allakhverdiev

{"title":"The resistance of Solanum lycopersicum photosynthetic apparatus to high-intensity blue light is determined mainly by the cryptochrome 1 content.","authors":"V Kreslavski, P Pashkovskiy, A Ashikhmin, A Kosobryukhov, A Shmarev, A Ivanov, V Strokina, M Vereshchagin, G Shirshikova, S I Allakhverdiev","doi":"10.32615/ps.2024.043","DOIUrl":"https://doi.org/10.32615/ps.2024.043","url":null,"abstract":"The effects of deficiency of cryptochrome 1 (CRY1), phytochrome B2 (phyB2) and the photoreceptor signalling DET-1 protein (hp-2 mutant) on photosynthesis and pro-/antioxidant balance in Solanum lycopersicum exposed to high-intensity blue light [HIBL, 72 h, 500/1,000 μmol(photon) m-2 s-1] were studied. Noticeable photoinhibition of photosynthesis and PSII was found in all these variants. However, the greatest decrease in photosynthesis and PSII activity was observed in the cry1 mutant. The difference among the other options was less pronounced. This low resistance of the cry1 mutant to HIBL is associated with reduced photosynthetic pigments, phenols, and anthocyanins. It appears that under HIBL, CRY1 and, to a lesser extent, phyB2 are required to maintain photosynthesis and antioxidant defence, mitigating blue light-induced oxidative stress. This study expands our understanding of the defence functions of CRY1 and highlights its importance in adapting the photosynthetic apparatus to HIBL.","PeriodicalId":20157,"journal":{"name":"Photosynthetica","volume":"63 1","pages":"1-9"},"PeriodicalIF":2.1,"publicationDate":"2025-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12012423/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143978564","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}

引用次数: 0

On "P750s" in cyanobacteria: A historical perspective. 蓝藻中的 "P750s"：历史视角。

IF 2.1 4区生物学

Photosynthetica Pub Date : 2024-12-18 eCollection Date: 2024-01-01 DOI: 10.32615/ps.2024.042

G Govindjee, L O Björn, R E Blankenship

引用次数: 0