Elevated CO2 Shifts Photosynthetic Constraint from Stomatal to Biochemical Limitations During Induction in Populus tomentosa and Eucalyptus robusta DOI Creative Commons
Xianhui Tang, Jie Zhao, Jiayu Zhou

et al.

Plants, Journal Year: 2024, Volume and Issue: 14(1), P. 47 - 47

Published: Dec. 27, 2024

The relative impacts of biochemical and stomatal limitations on photosynthesis during photosynthetic induction have been well studied for diverse plants under ambient CO2 concentration (Ca). However, a knowledge gap remains regarding how the various components limit duction efficiency elevated CO2. In this study, we experimentally investigated influence (from 400 to 800 μmol mol–1) dynamics its associated limitation in two broadleaved tree species, Populus tomentosa Eucalyptus robusta. results show that increased steady-state rate (A) decreased conductance (gs) maximum carboxylation (Vcmax) both species. While E. robusta exhibited decrease linear electron transport (J) fraction open reaction centers II (qL), P. showed significant increase non-photochemical quenching (NPQ). With respect non-steady-state photosynthesis, significantly reduced time A following shift from low high light intensity Time-integrated analysis revealed reduces consequently shifting predominant components. Additionally, species-specific changes qL NPQ suggest may by affecting energy allocation between carbon fixation photoprotection. These findings that, future CO2-rich atmosphere, productivity fluctuating be primarily constrained photochemical quenching.

Language: Английский

The Kinetics of Mesophyll Conductance and Photorespiration During Light Induction DOI Creative Commons
Ningyu Liu,

Jianxin Cao,

Mingying Yang

et al.

Plants, Journal Year: 2025, Volume and Issue: 14(6), P. 850 - 850

Published: March 8, 2025

Mesophyll conductance to CO2 (gm) act as a significant limiting factor influencing the assimilation rate (AN) during photosynthetic induction. However, effect of vapor pressure deficit (VPD) on gm kinetics light induction is not well clarified. We combined gas exchange with chlorophyll fluorescence measurements assess under contrasting in two tree species different stomatal (gs) behavior, Catalpa fargesii and Pterocarya stenoptera. Our results revealed three key findings: (1) coordination gs occurred C. but P. stenoptera, model largely determines whether exist given species; (2) high VPD induced simultaneous changes had separated effects indicating that response differs between (3) relative contribution photorespiration total electron flow was flexible change diffusional biochemical limitations, pointing out has role regulation These provide new sight into species-dependent

Language: Английский

Citations

0
The combined effect of decreased stomatal density and aperture increases water use efficiency in maize DOI Creative Commons

Larissa Barl,

Betina Debastiani Benato,

Nikita Genze

et al.

Scientific Reports, Journal Year: 2025, Volume and Issue: 15(1)

Published: April 21, 2025

Abstract Stomata play a crucial role in balancing carbon dioxide uptake and water vapor loss, thereby regulating plant use efficiency (WUE). Enhancing WUE is important for sustainable agriculture food security, particularly crops such as maize ( Zea mays L.), climate change growing global demand exacerbate limitations on availability. Genetic factors controlling stomatal density levels of the hormone abscisic acid (ABA) leaves, which affect aperture, are key determinants conductance (g s ) intrinsic (iWUE). In this study, we demonstrate that aperture have combined effect g iWUE maize. Using near-isogenic lines (NILs) CRISPR/Cas9 mutants, show combining reduced can improve without compromising photosynthesis. This pronounced at both, optimal high temperatures. These findings highlight potential targeting multiple traits through genetic stacking to enhance WUE, offering promising strategy crop adaptation water-limited environments.

Language: Английский

Citations

0
Exploring natural genetic diversity in a bread wheat multi-founder population: Dual imaging of photosynthesis and stomatal kinetics DOI Creative Commons
Michele Faralli, Greg Mellers, Shellie Wall

et al.

Journal of Experimental Botany, Journal Year: 2024, Volume and Issue: 75(21), P. 6733 - 6747

Published: May 23, 2024

Recent research has shown that optimizing photosynthetic and stomatal traits holds promise for improved crop performance. However, standard phenotyping tools such as gas exchange systems have limited throughput. In this work, a novel approach based on bespoke chamber allowing combined measurement of the quantum yield PSII (Fq'/Fm'), with an estimation conductance via thermal imaging was used to phenotype range bread wheat (Triticum aestivum L.) genotypes. Using dual-imaging methods traditional approaches, we found broad significant variation in key traits, including CO2 uptake at saturating light ambient concentration (Asat), elevated (Amax), maximum velocity Rubisco carboxylation (Vcmax), time opening (Ki), leaf evaporative cooling. Anatomical analysis revealed flag adaxial density. Associations between highlighted relationships cooling, conductance, Fq'/Fm', highlighting importance rapidity maintaining optimal temperature photosynthesis wheat. Additionally, gsmin gsmax were positively associated, indicating potential combinations preferable (i.e. inherently high gsmax, low Ki, maintained cooling) are present This work highlights effectiveness screening dynamic gs panel The wide phenotypic observed suggested presence exploitable genetic variability capacity targeted optimization within future breeding programmes.

Language: Английский

Citations

3
C4 monocots and C4 dicots exhibit rapid photosynthetic induction response in contrast to C3 plants DOI Creative Commons
K. TANIGAWA, Yuchen Qu, Naoya Katsuhama

et al.

Physiologia Plantarum, Journal Year: 2024, Volume and Issue: 176(4)

Published: July 1, 2024

Abstract Considering the prevalence of ever‐changing conditions in natural world, investigation photosynthetic responses C 4 plants under fluctuating light is needed. Here, we studied effect dynamic illumination on photosynthesis totally 10 3 , –C intermediate, ‐like and dicots monocots at CO 2 concentrations 400 800 μmol mol −1 . had faster induction light‐induced stomatal dynamics than but not which supply rarely limits photosynthesis. a higher water use efficiency both concentrations. There were positive correlations between response, together with compensation point, was parameter ‐concentrating mechanism These results clearly show that adapts to more efficiently The rapid response can be attributed dynamics, or both.

Language: Английский

Citations

1
Stomata: custodians of leaf gaseous exchange DOI Creative Commons
Tracy Lawson, Andrew D. B. Leakey

Journal of Experimental Botany, Journal Year: 2024, Volume and Issue: 75(21), P. 6677 - 6682

Published: Nov. 11, 2024

Language: Английский

Citations

1
Chloroplast ATP synthase restricts photosynthesis under fluctuating light in tomato but not in maize DOI
Yiyun Li, Xiaoqian Wang, Yingjie Yang

et al.

Plant Physiology and Biochemistry, Journal Year: 2024, Volume and Issue: 216, P. 109115 - 109115

Published: Sept. 10, 2024

Language: Английский

Citations

0
Elevated CO2 Shifts Photosynthetic Constraint from Stomatal to Biochemical Limitations During Induction in Populus tomentosa and Eucalyptus robusta DOI Creative Commons
Xianhui Tang, Jie Zhao, Jiayu Zhou

et al.

Plants, Journal Year: 2024, Volume and Issue: 14(1), P. 47 - 47

Published: Dec. 27, 2024

The relative impacts of biochemical and stomatal limitations on photosynthesis during photosynthetic induction have been well studied for diverse plants under ambient CO2 concentration (Ca). However, a knowledge gap remains regarding how the various components limit duction efficiency elevated CO2. In this study, we experimentally investigated influence (from 400 to 800 μmol mol–1) dynamics its associated limitation in two broadleaved tree species, Populus tomentosa Eucalyptus robusta. results show that increased steady-state rate (A) decreased conductance (gs) maximum carboxylation (Vcmax) both species. While E. robusta exhibited decrease linear electron transport (J) fraction open reaction centers II (qL), P. showed significant increase non-photochemical quenching (NPQ). With respect non-steady-state photosynthesis, significantly reduced time A following shift from low high light intensity Time-integrated analysis revealed reduces consequently shifting predominant components. Additionally, species-specific changes qL NPQ suggest may by affecting energy allocation between carbon fixation photoprotection. These findings that, future CO2-rich atmosphere, productivity fluctuating be primarily constrained photochemical quenching.

Language: Английский

Citations

0