Article
Plant Sciences
Qi Shi, Hu Sun, Stefan Timm, Shibao Zhang, Wei Huang
Summary: Plants grown under high light conditions have better photosynthetic performance and photorespiration capacity when facing fluctuating light. Photorespiration plays a protective role for photosystem I when there is a sudden increase in illumination.
Article
Biochemistry & Molecular Biology
Yan-Bao Lei, Hong-Xia Xia, Ke Chen, Andelka Plenkovic-Moraj, Wei Huang, Geng Sun
Summary: Mosses can grow under fluctuating light conditions due to the roles of FLVs and CEF in regulating photosynthesis, especially when exposed to temperature stress. The coordination between FLV activity and CEF under fluctuating light and temperature stress is crucial for the photosynthetic acclimation of different moss species. The mosses with different light requirements show distinct FLV activity and CEF levels, indicating a species-specific response to fluctuating light and temperature stress.
Article
Plant Sciences
Ying-Jie Yang, Qi Shi, Hu Sun, Ren-Qiang Mei, Wei Huang
Summary: This study demonstrated that different ontogenetic stages of leaves in epiphytic orchid Dendrobium officinale utilize different photoprotective mechanisms to deal with fluctuating light. Mature leaves use water-water cycle (WWC) to prevent over-reduction of PSI, while young leaves enhance cyclic electron flow (CEF) around PSI to compensate for the lack of WWC, thus avoiding uncontrolled PSI over-reduction induced by fluctuating light.
FRONTIERS IN PLANT SCIENCE
(2022)
Article
Plant Sciences
Marguerite Cinq-Mars, Guy Samson
Summary: This study revealed that the decline in CO2 assimilation at frequencies of 10 Hz and lower was associated with the formation of nonphotochemical quenching (NPQ) and a restriction of electron flows toward PSI. The results suggest that under these conditions, there is a favoring of accumulation of harmless P-700(+) at the expense of decreased quantum yield of photochemistry for PSII.
Article
Biochemistry & Molecular Biology
Hongxia Xia, Ke Chen, Lilan Liu, Andelka Plenkovic-Moraj, Geng Sun, Yanbao Lei
Summary: Photosynthesis regulation is crucial for bryophytes' adaptation to terrestrial life. Flavodiiron proteins and cyclic electron flow play important roles in bryophytes' response to abiotic stresses. In this study, the photosynthetic performance of three moss species was examined under heat, dehydration, and fluctuating light. The results showed that resistant species had a higher cyclic electron flow, which was positively correlated with flavodiiron proteins. However, this positive correlation switched to negative in the other two species under severe stress conditions.
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
Plant Sciences
Qi Chen, Yixin Lan, Qinghua Li, Mengmeng Kong, Hualing Mi
Summary: Plants have multiple mechanisms, including photosynthetic cyclic electron transports and photorespiration, to maintain efficient photosynthesis. This study reveals the functional link between these two mechanisms and shows that photorespiration can compensate for the loss of photosynthetic cyclic electron transport functions, thus playing a crucial role in maintaining efficient photosynthesis.
FRONTIERS IN PLANT SCIENCE
(2023)
Article
Plant Sciences
Gustaf E. Degen, Federica Pastorelli, Matthew P. Johnson
Summary: The production and consumption of ATP and NADPH in photosynthesis need to be carefully regulated. The PGR5 protein plays an important role in suppressing photosynthetic oscillations, and its absence leads to increased oscillatory behavior in Arabidopsis mutants.
JOURNAL OF EXPERIMENTAL BOTANY
(2023)
Article
Plant Sciences
Sheng-Pu Shuang, Jin-Yan Zhang, Zhu Cun, Hong-Min Wu, Jie Hong, Jun-Wen Chen
Summary: This study compares the photoprotective mechanisms among different light-demanding plants under dynamic light. The results show that sun plants have higher non-photochemical quenching and cyclic electron flow for photoprotection, while shade plants are more sensitive to transient dynamic light.
FRONTIERS IN PLANT SCIENCE
(2022)
Article
Plant Sciences
Antoaneta V. Popova, Martin Stefanov, Alexander G. Ivanov, Maya Velitchkova
Summary: A recent investigation has found that chloroplast structural changes may enhance the capacity for PSI-dependent cyclic electron flow and energy quenching, which can explain why lut2 is less susceptible to combined stresses of low temperature and high light intensity. Alternative electron transport pathways, PGR5-dependent CEF and PTOX-mediated electron transfer to oxygen, may be involved in the response of Arabidopsis plants to these stressors.
Article
Plant Sciences
Amit Kumar Chaturvedi, Orly Dym, Yishai Levin, Robert Fluhr
Summary: This study reveals the crucial role of redox state changes in PGRL1A in optimizing photosynthesis and highlights their importance in regulating plant growth under varying light conditions.
Article
Plant Sciences
Yu-Ting Li, Cheng Yang, Zi-Shan Zhang, Shi-Jie Zhao, Hui-Yuan Gao
Summary: This study investigated how wheat plants acclimate to intermittent high light conditions by growing them under different light regimes for 4 weeks. The results showed that wheat plants invest in photosynthetic carbon assimilation and increase photosynthetic electron transfer rate to adapt to high light exposure. The adaptation of photosynthesis to intermittent high light exposure depends on the proportion and duration of the high light exposure.
ENVIRONMENTAL AND EXPERIMENTAL BOTANY
(2021)
Article
Plant Sciences
Hu Sun, Qi Shi, Shi-Bao Zhang, Wei Huang
Summary: Photosystem I (PSI) is the main target of photoinhibition under fluctuating light (FL), and photosynthetic organisms use alternative electron flows to protect PSI under FL. The coordination of alternative electron flows under FL at different temperature stresses varies, with different responses observed in cyclic electron flow (CEF) and water-water cycle (WWC) at different temperatures. The findings indicate that CEF and WWC coordinate to protect PSI under FL at temperature stresses.
Article
Environmental Sciences
Hui Ren, Renhua Huang, Ying Li, Wanting Li, Liuliu Zheng, Yanbao Lei, Ke Chen
Summary: This study investigated the regulation mechanism of moss photosynthesis under strontium pollution. The results showed that moderate and high levels of Sr2+ stress triggered oxidative stress responses and photo-damage, while low levels of Sr2+ stress resulted in photosynthetic acclimation. These regulation mechanisms mainly involve the regulation of reactive oxygen species, activation of photo-inhibition and photo-protective mechanisms in photosystem I and photosystem II, as well as adjustments in flavodiiron proteins and cyclic electron flow.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Biology
Yuval Milrad, Valeria Nagy, Tamar Elman, Maria Fadeeva, Szilvia Z. Toth, Iftach Yacoby
Summary: A slow-down switch in photosystem II (PSII) has been found to limit H-2 generation from Chlamydomonas reinhardtii under anoxia, reducing photosynthetic productivity by three-fold. This activation occurs within 10 seconds of illumination and can be reversed after 15 minutes of dark anoxia. Understanding the mechanism of this switch provides insights into anoxic photosynthesis and offers potential strategies to improve bio-energy production.
COMMUNICATIONS BIOLOGY
(2023)
Article
Biochemistry & Molecular Biology
Wei Huang, Hu Sun, Shun-Ling Tan, Shi-Bao Zhang
Summary: The study demonstrates that the water-water cycle (WWC) can effectively assist the photosystem I (PSI) in responding to light changes at room temperature, but this mechanism is not applicable at low temperatures.
Article
Plant Sciences
Hu Sun, Qi Shi, Shi-Bao Zhang, Wei Huang
Summary: Photosystem I (PSI) is the main target of photoinhibition under fluctuating light (FL), and photosynthetic organisms use alternative electron flows to protect PSI under FL. The coordination of alternative electron flows under FL at different temperature stresses varies, with different responses observed in cyclic electron flow (CEF) and water-water cycle (WWC) at different temperatures. The findings indicate that CEF and WWC coordinate to protect PSI under FL at temperature stresses.
Article
Plant Sciences
Jie-Lin Wang, Shun-Ling Tan, Ming-Xia He, Wei Huang, Jun-Chao Huang
Summary: Overexpression of four genes involved in astaxanthin biosynthesis in Brassica napus resulted in the accumulation of nonnative ketocarotenoids, decreased levels of chlorophylls and other carotenoids, and ultimately led to slower growth and decreased biomass production in the transgenic plants. The reduced photosynthetic efficiency caused by the altered carotenoid levels negatively impacted plant growth in B. napus.
ENVIRONMENTAL AND EXPERIMENTAL BOTANY
(2021)
Article
Cell Biology
Jing-Qiu Feng, Wei Huang, Ji-Hua Wang, Shi-Bao Zhang
Summary: Two orchid species, P. dianthum and P. micranthum, employ different strategies to cope with fluctuating light, with P. dianthum relying on the water-water cycle and P. micranthum compensating with enhanced CEF. This diversity in photosynthetic acclimation strategies highlights the complexity of plant responses to changing light conditions within closely related species.
Article
Cell Biology
Shun-Ling Tan, Xing Huang, Wei-Qi Li, Shi-Bao Zhang, Wei Huang
Summary: The study reveals that elevated atmospheric CO2 can mitigate PSI photoinhibition under fluctuating light by facilitating rapid oxidation of PSI and activating more electron acceptors.
Article
Plant Sciences
Silin Chen, Ping Li, Shunling Tan, Xiaojun Pu, Ying Zhou, Keming Hu, Wei Huang, Li Liu
Summary: Chloroplasts in Nicotiana benthamiana respond to drought stress by adjusting stomatal movement and protein synthesis, leading to altered photosynthetic efficiency and expression of protective proteins. During recovery, repair mechanisms are activated to restore physiological functions and repair damages induced by drought stress. Prolonged re-watering period is required for gradual recovery of photosynthesis at both physiological and protein levels.
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
Cell Biology
Zhi-Lan Zeng, Hu Sun, Xiao-Qian Wang, Shi-Bao Zhang, Wei Huang
Summary: This study reveals that the regulation of leaf angle is an important strategy used by young leaves to protect PSI against photoinhibition under fluctuating light conditions. The vertical leaf angle decreases light absorption and lowers the amplitude of low/high light intensity, thus reducing PSI photoinhibition.
Article
Plant Sciences
Qi Shi, Hu Sun, Stefan Timm, Shibao Zhang, Wei Huang
Summary: Plants grown under high light conditions have better photosynthetic performance and photorespiration capacity when facing fluctuating light. Photorespiration plays a protective role for photosystem I when there is a sudden increase in illumination.
Article
Cell Biology
Hui Wang, Xiao-Qian Wang, Yi-Zhang Xing, Qing-Yun Zhao, Hui-Fa Zhuang, Wei Huang
Summary: In CAM plants, such as Vanilla planifolia, the enhancement of NPQ and Y(ND) for photoprotection when CO2 assimilation is restricted is mainly regulated by the activity of chloroplast ATP synthase (g(H)(+)) rather than cyclic electron flow (CEF).
Article
Cell Biology
Jun-Bin Cheng, Shi-Bao Zhang, Jin-Song Wu, Wei Huang
Summary: In this study, the dynamic changes of flavodiiron proteins (FLVs) and cyclic electron flow (CEF) in non-angiosperms were investigated. It was found that FLVs played a longer functional role in preventing PSI photoinhibition than previously thought, while CEF was mainly involved in energy balancing. When FLVs were inactivated, CEF was re-activated to favor photoprotection and sustain photosynthesis.
Article
Plant Sciences
Hu Sun, Shi-Bao Zhang, Jose Javier Peguero-Pina, Wei Huang
Summary: Compared to evergreens, deciduous tree species have higher photosynthetic capacity, which is evolutionally associated with increased stomatal conductance and mesophyll conductance. The difference in mesophyll conductance between the two groups is mainly determined by mesophyll and chloroplast surface area exposed to intercellular air space. Deciduous trees also display a faster induction speed of photosynthesis, mainly due to the maintenance of higher stomatal conductance. These cell-level traits allow deciduous trees to achieve carbon gains comparable to evergreen species despite their shorter growing season.
ENVIRONMENTAL AND EXPERIMENTAL BOTANY
(2023)
Article
Plant Sciences
Xiao-Qian Wang, Hu Sun, Zhi-Lan Zeng, Wei Huang
Summary: Nitrogen and water are essential resources for leaf photosynthesis and plant growth. The photosynthetic capacity of leaves within branches gradually increases from shade to sun leaves, accompanied by increased stomatal conductance and leaf nitrogen content. The adjustment of nitrogen and water investments within branches is important for optimizing photosynthetic carbon gain and nitrogen use efficiency.
PLANT PHYSIOLOGY AND BIOCHEMISTRY
(2023)
Article
Plant Sciences
Hu Sun, Qi Shi, Ning-Yu Liu, Shi-Bao Zhang, Wei Huang
Summary: We found that drought stress delays the initiation of photosynthesis and exacerbates the loss of carbon gain under fluctuating light in tomato seedlings. Additionally, drought stress aggravates the over-reduction of photosystem I and suppresses the photoprotection of photosystem I. However, drought stress also enhances relative cyclic electron flow, which partially compensates for restricted CO2 fixation and promotes the photoprotection of photosystem I.
PLANT PHYSIOLOGY AND BIOCHEMISTRY
(2023)
Article
Plant Sciences
Xiao-Qian Wang, Zhi-Lan Zeng, Zi-Ming Shi, Ji-Hua Wang, Wei Huang
Summary: Photosynthetic efficiency varies among different rose genotypes, with stomatal conductance playing a crucial role in determining the efficiency under fluctuating light conditions. This study compared the photosynthetic performance of two modern rose cultivars and one old Chinese rose plant, revealing the importance of mesophyll conductance in dynamic photosynthesis and its potential for improving photosynthetic efficiency in rose cultivars.