Journal of photochemistry and photobiology. B, Biology最新文献

{"title":"“Illuminated Glycoporphyrins”: A photodynamic approach for Candida albicans inactivation","authors":"Yohana B. Palacios ,&nbsp;Sebastián O. Simonetti ,&nbsp;Claudia Hernández Chavez ,&nbsp;María G. Álvarez ,&nbsp;Paula V. Cordero ,&nbsp;Emma A. Cuello ,&nbsp;Edwin J. González López ,&nbsp;Enrique L. Larghi ,&nbsp;Maximiliano L. Agazzi ,&nbsp;Edgardo N. Durantini ,&nbsp;Daniel A. Heredia","doi":"10.1016/j.jphotobiol.2025.113105","DOIUrl":"10.1016/j.jphotobiol.2025.113105","url":null,"abstract":"<div><div>The continuous increase in the incidence of invasive mycoses, particularly those caused by <em>Candida albicans</em>, is a relevant health issue worldwide due to the lack of effective antifungals and the constant emergence of resistant strains. One of the most promising therapies to treat infections caused by resistant microorganisms is photodynamic inactivation (PDI). The development of novel photosensitizers (PSs) with suitable properties is a key factor to consider when optimizing this therapy. In this work, we designed, synthesized, and characterized four glycoporphyrins functionalized with <em>S</em>-galactose (acetylated and deacetylated) and varying the number of tertiary amino groups as precursors of cationic centers, which can be activated by protonation at physiological pH. The amino and glycosyl groups were introduced to enhance interaction with the microbial cell wall, increase hydrophilicity, and evaluate their combined effect on PS efficiency in photoinactivation. All derivatives presented the characteristic absorption and emission properties of the porphyrin macrocycle. Moreover, the glycoporphyrins were capable of generating singlet oxygen and superoxide anion radical. The photophysical and photodynamic properties were not affected by the different substitution patterns on the porphyrin core. PDI treatments of <em>C. albicans</em> cultures, treated with 5 μM of the PS and irradiated for 30 min, produced cellular inactivation of ∼3.5 log for glycoporphyrins with cationic centers. Furthermore, PDI of <em>C. albicans</em> mediated by glycoporphyrins was potentiated by the addition of KI. Under these conditions, a significant enhancement in cellular death was observed, achieving complete eradication of the treated cell suspensions. Moreover, glycoporphyrins containing pH-activable groups, combined with KI, showed outstanding efficacy against <em>C. albicans</em> pseudohyphae. These <em>in vitro</em> findings underscore the significant impact of substitution patterns on antimicrobial action. To our knowledge, this study marks the first application of glycosylated porphyrin derivatives containing pH-activatable cationic groups in the photoinactivation of <em>C. albicans</em>, paving the way for the development of novel derivatives with potential applications as effective antifungal PSs.</div></div>","PeriodicalId":16772,"journal":{"name":"Journal of photochemistry and photobiology. B, Biology","volume":"264 ","pages":"Article 113105"},"PeriodicalIF":3.9,"publicationDate":"2025-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143349637","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effectiveness of Photobiomodulation (low-level laser therapy) on treatment of oral mucositis (OM) induced by chemoradiotherapy in head and neck cancer patients.","authors":"Shadi Barati ,&nbsp;Safa Motevasseli ,&nbsp;Hamid Saeidi Saedi ,&nbsp;Pantea Amiri ,&nbsp;Reza Fekrazad","doi":"10.1016/j.jphotobiol.2025.113115","DOIUrl":"10.1016/j.jphotobiol.2025.113115","url":null,"abstract":"<div><h3>Purpose</h3><div>Mucositis is a common and debilitating side effect of cancer treatment, causing significant pain and discomfort. This study aimed to evaluate the effectiveness of Photobiomodulation in treating mucositis induced by chemoradiotherapy in cancer patients.</div></div><div><h3>Methods</h3><div>This randomized, single-blind clinical trial involved 36 patients with grade 3‐4 oral mucositis. The test group (<em>n</em> = 18) received diode portable laser therapy (810 nm wavelength, 200 mW power, 6 J/cm² energy density) for 4 days. The control group (<em>n</em> = 18) used a Diphenhydramine + Almgs mouthwash (50‐50% mixture, 15 ml, every 6 h for 4 days). Lesions were assessed before treatment, one week after, and again at one month.</div></div><div><h3>Results</h3><div>Pain scores in the laser group decreased significantly over time (<em>P</em> &lt; 0.05). Patients in the laser group reported better quality of life and reduced oral discomfort compared to the control group (P &lt; 0.05). The severity of mucositis significantly decreased in the laser group within the first week (P &lt; 0.05), though no significant difference was observed at one month (<em>P</em> = 0.158).</div></div><div><h3>Conclusion</h3><div>The study demonstrates that Photobiomodulation is a more effective and efficient method for reducing pain, tingling, and improving quality of life in both the short and long term. It also reduces the severity of oral mucositis in the short term for patients with head and neck cancer undergoing chemoradiotherapy.</div></div>","PeriodicalId":16772,"journal":{"name":"Journal of photochemistry and photobiology. B, Biology","volume":"264 ","pages":"Article 113115"},"PeriodicalIF":3.9,"publicationDate":"2025-01-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143070961","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Application of different lights in solving the marine biofouling problem of uranium extraction from seawater","authors":"Meng Yan,&nbsp;Dadong Shao","doi":"10.1016/j.jphotobiol.2025.113114","DOIUrl":"10.1016/j.jphotobiol.2025.113114","url":null,"abstract":"<div><div>Marine biofouling remains a big problem of uranium (U(VI)) extraction from seawater. To better utilize sunlight in future, the anti-biofouling properties of typical light sources were evaluated, and ultraviolet (UV) light shows best anti-biofouling capability among studied lights. UV light can damage the cellular structure and intercept the proliferation of marine microorganisms (such as <em>V. alginolyticus</em>), and further control its extracellular polymeric substances (EPS). Microorganism community results clarify that UV light well represses the reproduction and survival of marine microorganisms under different conditions (such as temperature and region), which is in favor of U(VI) extraction. The adsorption capacity of classical U(VI) extraction material poly(amidoxime) (PAO) for U(VI) outstandingly recycled from 47.5 mg/g to 68.5 mg/g after UV irradiated for 12 h at pH 8.2 and 25 °C. UV light can well solve the marine biofouling problem of U(VI) extraction from seawater.</div></div>","PeriodicalId":16772,"journal":{"name":"Journal of photochemistry and photobiology. B, Biology","volume":"264 ","pages":"Article 113114"},"PeriodicalIF":3.9,"publicationDate":"2025-01-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143066326","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Syringic acid protective role: Combatting oxidative stress induced by UVB radiation in L-929 fibroblasts","authors":"Karine Campos Nunes ,&nbsp;Danielle Lazarin-Bidoia ,&nbsp;Tânia Ueda-Nakamura ,&nbsp;Sueli de Oliveira Silva Lautenschlager ,&nbsp;Raphaël Michel ,&nbsp;Rachel Auzély-Velty ,&nbsp;Celso Vataru Nakamura","doi":"10.1016/j.jphotobiol.2025.113104","DOIUrl":"10.1016/j.jphotobiol.2025.113104","url":null,"abstract":"<div><div>Neglecting proper skin care and repeated exposure to ultraviolet (UV) radiation can have serious consequences, including skin burns, photoaging and even the development of skin cancer. UV radiation-induced damage is mediated by highly unstable and reactive molecules, named reactive oxygen species (ROS). To counteract ROS, the skin has an endogenous antioxidant system. Considering that, many sunscreens incorporate antioxidant substances to ensure additional photochemioprotective action in the formulation. Syringic acid (SA) is classified as a phenolic acid derived from hydroxybenzoic acid. It has antioxidant properties, which can reduce oxidative stress, and has shown potential to prevent skin cancer. The aim of this study was to assess the ability of SA to protect L-929 fibroblasts from UVB radiation by evaluating oxidative stress biomarkers. As a result, we demonstrated the antioxidant activity of SA through four methodologies, and confirmed the photochemioprotective activity of SA by attenuating the cytotoxicity of UVB radiation in L-929 fibroblasts. The mechanisms involved in the photoprotection of SA include a significant reduction in total ROS, maintenance of mitochondrial membrane potential, decrease in lipid peroxidation, preservation of endogenous antioxidant system enzymes and reduced glutathione (GSH) levels, thereby mitigating the ultrastructural damage caused by UVB. Additionally, SA showed promising results in wound healing. Considering such properties, SA emerges as a strong candidate for incorporation into photoprotective and multifunctional formulations.</div></div>","PeriodicalId":16772,"journal":{"name":"Journal of photochemistry and photobiology. B, Biology","volume":"264 ","pages":"Article 113104"},"PeriodicalIF":3.9,"publicationDate":"2025-01-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143066329","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Polyphenol production and gene expression in sage shoot cultures exposed to light-emitting diodes","authors":"Izabela Grzegorczyk-Karolak ,&nbsp;Katarzyna Gawęda-Walerych ,&nbsp;Wiktoria Ejsmont ,&nbsp;Aleksandra Owczarek-Januszkiewicz ,&nbsp;Monika Olszewska ,&nbsp;Renata Grąbkowska ,&nbsp;Marta Krzemińska","doi":"10.1016/j.jphotobiol.2025.113106","DOIUrl":"10.1016/j.jphotobiol.2025.113106","url":null,"abstract":"<div><div>Sages and their beneficial secondary metabolites have been used in conventional and traditional medicine in many countries, and are extensively studied for their health effects. However, to achieve high production levels, it is crucial to optimize the cultivation conditions. The aim of our study was to determine the optimal light-emitting diode (LED) treatment strategy for promoting plant growth and polyphenol biosynthesis in <em>S. atropatana</em> and <em>S. bulleyana in vitro</em> cultures. Shoots of both species were grown under red, blue, mixed (70 % red and 30 % blue), or white (control) light. The lighting conditions affected not only culture growth and proliferation potential, but also the accumulation of polyphenols and the expression of the genes involved in their biosynthesis (<em>PAL</em>, <em>TAT</em>, <em>RAS</em>). The highest proliferation rates (6.21 for <em>S. atropatana</em> and 4.26 for <em>S. bulleyana</em>) were achieved under white LEDs. In contrast, the highest biomass production was observed under white and mixed red/blue light (both species), although a similar effect was revealed for the blue light treatment for <em>S. bulleyana</em>. The dominant polyphenol in both species was rosmarinic acid: its level was highest in <em>S. atropatana</em> shoots exposed to red light (20.86 mg/g dry weight, DW) and <em>S. bulleyana</em> under white light (19.72 mg/g DW). The effects of the light treatments on gene expression varied between plant species and the analyzed gene; for example, mixed light stimulated <em>RAS</em> expression in <em>S. bulleyana</em> shoots and inhibited it in <em>S. atropatana</em> shoots. Principal component analysis found that gene expression did not always translate directly into rosmarinic acid production. In summary, our findings indicate that optimized lighting conditions have a significant effect on the production of polyphenolic compounds in sage shoot cultures. However, further research is needed to find the relationship between light treatment and plant biosynthetic pathway.</div></div>","PeriodicalId":16772,"journal":{"name":"Journal of photochemistry and photobiology. B, Biology","volume":"264 ","pages":"Article 113106"},"PeriodicalIF":3.9,"publicationDate":"2025-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143059404","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Proteomic insight into growth and defense strategies under low ultraviolet-B acclimation in the cyanobacterium Nostoc sphaeroides","authors":"Zhen Chen,&nbsp;Xun Wu,&nbsp;Zhe Liu,&nbsp;Zhen He,&nbsp;Hua-Hua Yue,&nbsp;Fei-Fei Li,&nbsp;Kui Xu,&nbsp;Hai-Chen Shao,&nbsp;Wei-Zhi Li,&nbsp;Xiong-Wen Chen","doi":"10.1016/j.jphotobiol.2025.113101","DOIUrl":"10.1016/j.jphotobiol.2025.113101","url":null,"abstract":"<div><div>Prioritizing defense over growth often occurs under ultraviolet (UV)-B radiation while several studies showed its growth-promoting effects on photosynthetic organisms, how they overcome the growth–defense trade-off is unclear. This study deciphered the acclimation responses of the cyanobacterium <em>Nostoc sphaeroides</em> to low UV-B radiation (0.08 W m⁻²) using quantitative proteomic, physiological and biochemical analyses. We identified 628 significantly altered proteins, among which energy production and conversion related proteins dominated. The UV-B-acclimated cells exhibited a significant increase in the abundance of the phycoerythrin and chlorophyll synthesis related enzymes, along with enhanced linear and cyclic electron transport rates, which further led to a rise in light-induced NADPH generation (27 %) and ATP content (67 %). The enhanced photosynthetic energy supply could fuel both growth and defense in <em>Nostoc sphaeroides</em>. The UV-B-acclimated cells showed enhanced photosynthetic carbon fixation, as evidenced by an increase in extracellular carbonic anhydrase activity (142 %), ribulose-1,5-bisphosphate carboxylase/oxygenase activity (87 %) and the pH compensation point, compared to non-UV-B-acclimated cells. Low UV-B also induced ribosome heterogeneity, as indicated by significant changes in the abundance of core ribosomal proteins, RNA modification related enzymes, and ribosome biogenesis and translation related accessory factors. Additionally, low UV-B activated multiple defense strategies, such as significant upregulation of mycosporine-like amino acid synthesis, RecA-dependent DNA repair pathways and the glutathione redox system. Our findings suggested that growth and defense were balanced by enhancing the photosynthetic energy supply under low UV-B acclimation in the cyanobacterium <em>Nostoc sphaeroides</em>, which provides novel insight into mechanisms for overcoming growth–defense trade-offs.</div></div>","PeriodicalId":16772,"journal":{"name":"Journal of photochemistry and photobiology. B, Biology","volume":"264 ","pages":"Article 113101"},"PeriodicalIF":3.9,"publicationDate":"2025-01-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143039111","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Targeting effective treatment to cutaneous Leishmaniasis: A preclinical investigation on photodynamic therapy mediated by the water-soluble Zn(II) porphyrin, ZnTnHex-2-PyP4+","authors":"Tiago H.S. Souza ,&nbsp;Fernanda V. Cabral ,&nbsp;José F. Sarmento-Neto ,&nbsp;Júlio S. Rebouças ,&nbsp;Beate S. Santos ,&nbsp;Martha S. Ribeiro ,&nbsp;Regina C.B.Q. Figueiredo ,&nbsp;Adriana Fontes","doi":"10.1016/j.jphotobiol.2024.113077","DOIUrl":"10.1016/j.jphotobiol.2024.113077","url":null,"abstract":"<div><div>The current chemotherapy for cutaneous leishmaniasis (CL) is accompanied by side effects and drug resistance emergence, encouraging the proposal of new treatment approaches for this disease. ZnTnHex-2-PyP⁴⁺ (ZnP hexyl) is a water-soluble Zn(II) porphyrin that exhibits remarkable potential for photodynamic therapy (PDT). This study aimed to investigate the ZnP hexyl-PDT against CL <em>in vivo</em>. As far as we know, this is the first investigation with this Zn(II) porphyrin in an animal model. The influence of the number and time interval of sessions on photodynamic effects was also investigated. BALB/c mice infected with <em>Leishmania amazonensis</em> were divided in 4 groups (untreated control, 1, 2, or 3 PDT sessions). In PDT groups, animals received ZnP hexyl (5 μM, 0.17 μg, 30 μL <em>per</em> animal/session) and were irradiated with blue LED. Parasite burden was quantified by bioluminescence for up to 21 days. The infected paw thickness and nociceptive analyses were also assessed. In treated groups, parasite burden showed an over time decrease compared to the control, indicating ZnP hexyl-PDT efficiency, mainly after 3 sessions, achieving about 91% reduction. Overall, no differences in infected paw thickness and nociceptive sensibility were observed among the groups. Results also indicated the importance of tuning the time interval between sessions to enhance therapeutic outcomes and diminish adverse effects. Under the conditions studied, weekly PDT sessions were superior, as intervals ≤ 72-h led to a temporary increase in infected paw thickness and nociceptive sensibility at day 7. This study pointed out that ZnP hexyl-PDT holds promise as an ally for CL treatment.</div></div>","PeriodicalId":16772,"journal":{"name":"Journal of photochemistry and photobiology. B, Biology","volume":"262 ","pages":"Article 113077"},"PeriodicalIF":3.9,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142818464","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Photoacclimation strategies of Chlamydomonas reinhardtii in response to high-light stress in stationary phase","authors":"Shilpa Devkota,&nbsp;Dion G. Durnford","doi":"10.1016/j.jphotobiol.2024.113082","DOIUrl":"10.1016/j.jphotobiol.2024.113082","url":null,"abstract":"<div><div>Under ideal conditions, <em>Chlamydomonas reinhardtii</em> can photoacclimate to excess light through various short- and long-term mechanisms. However, how microalgae handle excess light stress once they exit exponential growth, and especially in stationary phase, is less understood. Our study explored <em>C. reinhardtii'</em>s photoprotection capacity and acclimation strategies during high-light stress once batch culture growth reached stationary phase. We monitored cultures of wildtype strain (<em>CC125</em>) over five days once they reached stationary phase under both low-light (LL) and high-light (HL) conditions. Under HL, many photosynthetic proteins were degraded but the stress-related light harvesting complex protein (LHCSR) was rapidly induced and contributed to the rapid activation of nonphotochemical quenching (NPQ). However, the LHCSR3-defective mutant (CC4614, <em>npq4</em>) lacked the rapid induction of quenching typical of post-exponential cultures, indicating that LHCSR3 is required for this response in stationary phase. Collectively, the main strategy for photoacclimation in stationary phase appears to be a dramatic reduction of photosystems while maintaining LHCII-LHCSR antenna complexes that prime the antenna for rapid activation of quenching upon light exposure. Part of this response to HL involves a resumption of cell growth after two days, that we hypothesized is due to the stimulation of growth-regulating pathways due to increased metabolite pools from the HL-induced protein turnover in the cell, something that remains to be tested. These findings demonstrate how <em>C. reinhardtii</em> manages high-light stress during stationary phases to maximize longevity.</div></div>","PeriodicalId":16772,"journal":{"name":"Journal of photochemistry and photobiology. B, Biology","volume":"262 ","pages":"Article 113082"},"PeriodicalIF":3.9,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142854466","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Comparison of the mechanisms of DNA damage following photoexcitation and chemiexcitation","authors":"Andreia Boaro ,&nbsp;Luiz Duarte Ramos ,&nbsp;Erick Leite Bastos ,&nbsp;Etelvino José Henriques Bechara ,&nbsp;Fernando Heering Bartoloni","doi":"10.1016/j.jphotobiol.2024.113070","DOIUrl":"10.1016/j.jphotobiol.2024.113070","url":null,"abstract":"<div><div>In this review, we compare the mechanisms and consequences of electronic excitation of DNA via photon absorption or photosensitization, as well as by chemically induced generation of excited states. The absorption of UV radiation by DNA is known to produce cyclobutane pyrimidine dimers (CPDs) and thymine pyrimidone photoproducts. Photosensitizers are known to enable such transformations using UV-A and visible light by generating triplet species able to transfer energy to DNA. Conversely, chemiexcitation of DNA is a process related to the formation of high energy peroxides whose decomposition leads to triplet excited species. In practice, both photoexcitation and chemiexcitation produce reactive excited species able to promote some DNA nucleobases to their excited state. We discuss the effect of epigenetic methylation modifications of DNA and the role of endogenous and exogenous photosensitizers on the formation of DNA photoproducts via triplet-triplet energy transfer as well as oxidative DNA damages. The mechanisms of pathogenic pathway involving the generation of CPDs via chemiexcitation (namely dark CPDs, dCPDs) are discussed and compared with photoexcitation considering their spatiotemporal characteristics. Recognition of the multifaceted noxious effects of UV radiation opens new horizons for the development of effective electronically excited quenchers, thereby providing a crucial step toward mitigating DNA photodamage.</div></div>","PeriodicalId":16772,"journal":{"name":"Journal of photochemistry and photobiology. B, Biology","volume":"262 ","pages":"Article 113070"},"PeriodicalIF":3.9,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142807155","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Updates to McCree's photosynthetically active radiation curve — 55 years later","authors":"Bo-Sen Wu,&nbsp;Philip Wiredu Addo,&nbsp;Sarah MacPherson,&nbsp;Valérie Orsat,&nbsp;Mark Lefsrud","doi":"10.1016/j.jphotobiol.2024.113069","DOIUrl":"10.1016/j.jphotobiol.2024.113069","url":null,"abstract":"<div><div>Our interpretation of photosynthetically active radiation in plants has evolved since the 1970s with new data explaining the underlying mechanisms. To update McCree's founding work, this study explored the spectral response of photosynthesis in young tomato (<em>Solanum lycopersicum</em> cv. Beefsteak) and lettuce (<em>Lactuca sativa</em> cv. Breen) plants using a narrow-spectrum light unit and a portable photosynthesis system equipped with a whole plant chamber. Highly resolved spectral photosynthesis curves using 1-nm increments at 10 nm full width at half maximum (FWHM) were generated. Results show that the lowest quantum yields were observed at 450 nm and 660 nm, two wavelengths commonly used to improve photosynthesis in research. Different trends and amplified peaks were observed among the spectral quantum yield curves of tomato and lettuce plants and those of earlier studies with red and blue light. An opposing phenomenon was observed, where blue light is more efficient than red light. This is based on the narrower wavelength data acquired in both experimental plant species. Findings represent the most detailed and highly resolved spectral photosynthesis and quantum yield curves to date using experimental model plants (tomato and lettuce).</div></div>","PeriodicalId":16772,"journal":{"name":"Journal of photochemistry and photobiology. B, Biology","volume":"262 ","pages":"Article 113069"},"PeriodicalIF":3.9,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142780492","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}