Article
Chemistry, Applied
Huixin Fang, Qian Zhou, Shunchang Cheng, Xin Zhou, Baodong Wei, Yingbo Zhao, Shujuan Ji
Summary: The study showed that treatment with 24-epibrassinolide (EBR) can effectively inhibit postharvest yellowing in broccoli by maintaining higher chlorophyll content and antioxidant enzyme activities, making it an effective method for improvement.
Article
Plant Sciences
Zhihuan Zhang, Xuena Liu, Na Li, Bili Cao, Tingting Huang, Ping Li, Shuqin Liu, Yongzhi Zhang, Kun Xu
Summary: This study investigated the effects of ofloxacin (OFL) concentration on tomato growth, photosynthetic activity, and chlorophyll fluorescence kinetics. The results showed that lower OFL concentrations had little impact on tomato growth, but higher concentrations caused chloroplast rupture, chlorophyll degradation, leaf etiolation, and inhibition of photosynthesis. Furthermore, the photosynthetic and photochemical efficiency and electron transfer rate were significantly inhibited by OFL.
PLANT PHYSIOLOGY AND BIOCHEMISTRY
(2023)
Article
Plant Sciences
Hu Sun, Qi Shi, Shi-Bao Zhang, Wei Huang
Summary: The study found that leaf nitrogen content significantly influenced the response of PSI to fluctuating light in tomatoes grown under nitrogen deficiency. High-nitrogen plants were more susceptible to over-reduction of PSI compared to low-nitrogen plants, which gradually increased PSII electron flow to avoid this issue.
ENVIRONMENTAL AND EXPERIMENTAL BOTANY
(2022)
Article
Agronomy
Tahereh Ashrostaghi, Sasan Aliniaeifard, Aida Shomali, Shiva Azizinia, Jahangir Abbasi Koohpalekani, Moein Moosavi-Nezhad, Nazim S. Gruda
Summary: Low temperatures have a significant impact on the geographic distribution of warm-season crops such as cucumber. This study investigates the effects of light intensity on photosynthesis and biochemical traits under low temperature stress. The results show that high photon flux densities exacerbate the negative effects of low temperature on cucumber seedlings.
Article
Plant Sciences
Bo-Sen Wu, Mahnaz Mansoori, Keli Trumpler, Philip Wiredu Addo, Sarah MacPherson, Mark Lefsrud
Summary: Full-spectrum light-emitting diodes (LEDs) with specific amber and blue light wavelengths and bandwidths were studied for their effects on tomato growth and production efficiency. Narrow amber light combined with narrow blue light led to the highest fresh mass yield, followed by white LED and a high-pressure sodium lamp. Chlorophyll content increased with the addition of blue light. The findings suggest that precise selection of amber and blue wavelengths can greatly impact tomato growth and development, making narrow-wavelength combination a more energy-efficient option.
Article
Agronomy
Paulina A. Rajewicz, Chao Zhang, Jon Atherton, Shari Van Wittenberghe, Anu Riikonen, Troy Magney, Beatriz Fernandez-Marin, Jose Ignacio Garcia Plazaola, Albert Porcar-Castell
Summary: Chlorophyll fluorescence can be used as a proxy for photosynthesis in boreal forests. This study measured the spectral chlorophyll fluorescence in leaves of three dominant evergreen species in the boreal ecosystem and analyzed the correlations with other traits to understand the spatial and temporal variation in chlorophyll fluorescence. The findings suggest that the diversity of species and light environments within an ecosystem generate baseline variation in leaf spectral chlorophyll fluorescence and contrasting seasonal photosynthetic acclimation patterns.
AGRICULTURAL AND FOREST METEOROLOGY
(2023)
Article
Plant Sciences
Aida Shomali, Sasan Aliniaeifard, Mohammad Mohammadian, Mahmoud Lotfi, Hazem M. Kalaji
Summary: High light intensity has a significant impact on the photosynthetic apparatus of tomatoes. Different genotypes show varying responses, with tolerant genotypes exhibiting reduced photoinhibitory quenching compared to sensitive genotypes. Quantum yield components also shift under high light, favoring the quantum yield of non-photochemical quenching and basal energy loss, while reducing the quantum yield of photosystem II. These findings provide insights into the mechanisms of high light tolerance in tomatoes and can aid in the development of resilient crops for variable light conditions.
PHYSIOLOGIA PLANTARUM
(2023)
Article
Biochemistry & Molecular Biology
Qi-Shi, Shi-Bao Zhang, Ji-Hua Wang, Wei Huang
Summary: The study showed that pre-illumination under high light conditions accelerates the activation rate of cyclic electron flow (CEF) and reduces the over-reduction of Photosystem I (PSI) under fluctuating light, by facilitating the electron sink downstream of PSI.
Article
Agronomy
Dominika Radzikowska-Kujawska, Paula John, Tomasz Piechota, Marcin Nowicki, Przemyslaw Lukasz Kowalczewski
Summary: In order to prevent further degradation of the environment, restrictions on the use of plant protection products and fertilizers are being strengthened annually. This study evaluated the effectiveness of four commercial biostimulants in improving the tolerance of winter wheat to drought stress. Among the biostimulants tested, those based on bacterial strains had the strongest positive effects on wheat plants' drought tolerance. These treatments led to higher CO2 assimilation, reduced transpiration values, and increased stomatal conductance under drought conditions, indicating improved water use efficiency. The use of these bacterial biostimulants also resulted in less damage to the photosynthetic apparatus and higher grain yield compared to other treatments. These findings suggest the potential of these biostimulants in mitigating drought-related yield losses in wheat.
Article
Plant Sciences
Luiz Felipe da Silva Cunha, Victor Pereira de Oliveira, Antonio Wellinton Silva do Nascimento, Breno Ricardo Serrao da Silva, Bruno Lemos Batista, Abdulaziz Abdullah Alsahli, Allan Klynger da Silva Lobato
Summary: The study demonstrates that foliar application of EBR can improve gas exchange in plants and alleviate the impact of Cd toxicity on leaf anatomy.
PHYSIOLOGIA PLANTARUM
(2021)
Article
Agronomy
Chung- Chen, Kuan-Hung Lin, Meng-Yuan Huang, Chih-Kai Yang, Yu-Hsiu Lin, Mei-Li Hsueh, Li-Hua Lee, Ching-Wen Wang
Summary: SC and NT are two different modern orchard management systems in Taiwan for sustainable citrus orchard development. SC showed higher physiological parameters like Rd, Qy, LCP, Amax, and Fv/Fm compared to NT, especially in fall and winter. Pn, Gs, ETR, NPQ, and Fv/Fm values were higher in spring and summer compared to fall and winter, with positive correlations between Pn and Gs under both NT and SC in all seasons, and significant negative relationships between ETR and NPQ under NT in fall and winter.
Article
Plant Sciences
Zhu Cun, Xiang-Zeng Xu, Jin-Yan Zhang, Sheng-Pu Shuang, Hong-Min Wu, Tong-Xin An, Jun-Wen Chen
Summary: Photosynthetic adaptive strategies of shade-tolerant species Panax notoginseng to high and low light conditions were investigated. Growth irradiance affected the thickness of leaf tissues and the performance of photosynthesis-related pigments and antioxidant enzymes. The results suggest that PSI photoinhibition and photodamage to PSII acceptor side are key factors influencing the adaptability of P. notoginseng to different light regimes.
FRONTIERS IN PLANT SCIENCE
(2023)
Article
Plant Sciences
Andrej Filacek, Marek Zivcak, Lorenzo Ferroni, Maria Barboricova, Kristina Gasparovic, Xinghong Yang, Marco Landi, Marian Brestic
Summary: The study found that high temperature significantly reduced the photosynthetic assimilation rate due to non-stomatal (biochemical) limitation of photosynthetic processes; chlorophyll fluorescence only showed a mild decrease in the quantum efficiency of photosystem II, indicating mainly reversible heat stress effects; heat stress led to a decrease in the number of active PS II reaction centers (RC/ABS) and overall activity of PSII (PIabs) in all genotypes, while PS I (parameter psi(REo)) was negatively influenced by heat stress only in the non-acclimated variant.
Article
Plant Sciences
Jianqiang Mu, Yajuan Fu, Bucang Liu, Yao Zhang, Aiying Wang, Yuxia Li, Jianbo Zhu
Summary: Saussurea involucrata is a cold-resistant plant species that grows in extreme arctic conditions. The key enzyme Fructose-1, 6-bisphosphate aldolase (FBA) plays a crucial role in the photosynthesis process. A cold-responsive gene, SiFBA5, has been identified and shown to positively regulate plant response to cold stress, offering potential for improving crop yield under cold stress conditions.
Article
Plant Sciences
W-H Hu, X-H Hu, C. Liu, B-Q Wang, X-H Yan
Summary: This study investigated the protective mechanisms of brassinosteroids in tomato under chilling stress. The results showed that exogenous EBR alleviated PS II photoinhibition by increasing CO2 assimilation and thermal dissipation of excitation energy. EBR also promoted the absorption, trapping, and electron transport per leaf area in chilled tomatoes by increasing the density of active reaction centers.
BIOLOGIA PLANTARUM
(2022)
