Vapor-pressure-deficit-controlled temperature response of photosynthesis in tropical trees DOI Creative Commons
Chinedu Emmanuel Eze, Klaus Winter, Martijn Slot

et al.

Photosynthetica, Journal Year: 2024, Volume and Issue: 62(3), P. 318 - 325

Published: Oct. 10, 2024

Rising temperatures can affect stomatal and nonstomatal control over photosynthesis, through closure in response to increasing vapor pressure deficit (VPD), biochemical limitations, respectively. To explore the independent effects of temperature VPD, we conducted leaf-level temperature-response measurements while controlling VPD on three tropical tree species. Photosynthesis conductance consistently decreased with whereas photosynthesis typically responded weakly changes when a stable was maintained during measurements, resulting wide parabolic curves. We have shown that negative effect forests across ecologically important ranges does not stem from direct warming processes but indirect warming, VPD. Understanding acclimation potential trees elevated will be critical anticipate consequences global for forests.

Language: Английский

Nitrogen Supply Mitigates Temperature Stress Effects on Rice Photosynthetic Nitrogen Use Efficiency and Water Relations DOI Creative Commons
Zhuang Xiong, Fangzhou Zheng, Chao Wu

et al.

Plants, Journal Year: 2025, Volume and Issue: 14(6), P. 961 - 961

Published: March 19, 2025

Climate-change-induced temperature fluctuations pose significant threats to global rice production, particularly through their impact on photosynthetic efficiency. The differential mechanisms by which low and high temperatures affect leaf processes in remain poorly understood. Here, we investigate the effects of stress (15 °C, 30 45 °C) performance across a gradient nitrogen supply levels: (LN), medium (MN), (HN). exhibited stronger negative impacts photosynthesis than temperature, primarily increased mesophyll limitation disrupted cellular CO2 diffusion, while showed less pronounced effects, under HN MN conditions. While use efficiency (PNUE) decreased with increasing optimal moderate maintained PNUE stress, suggesting that balanced level is crucial for maximizing both capacity Plants adequate higher intrinsic water (iWUE) extremes improved coordination between uptake loss. Our findings reveal distinct underlying low- high-temperature highlight importance optimizing management enhancing crop resilience climate change.

Language: Английский

Citations

1
Heat-induced F<sub>0</sub>-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 DOI Creative Commons
Klaus Winter, María Elena García,

Aurelio Virgo

et al.

Photosynthetica, Journal Year: 2025, Volume and Issue: 63(1), P. 46 - 50

Published: Feb. 27, 2025

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 known about how Tcrit correlates irreversible leaf tissue damage. Young and mature leaves tropical tree species Calophyllum inophyllum were heated stepwise from 30 55°C, 1°C min-1. was 47°C in young 49°C leaves. Contrary higher 55°C elicited greater damage than their respective or + 2°C exhibited no necrosis after 14 d post-culture. It concluded that measurements temperature-dependent rise underestimate thermal thresholds above significant occurs.

Language: Английский

Citations

0
Incorporating the Acclimation of Photosynthesis and Leaf Respiration in the Noah‐MP Land Surface Model: Model Development and Evaluation DOI Creative Commons

Yanghang Ren,

Han Wang, Sandy P. Harrison

et al.

Journal of Advances in Modeling Earth Systems, Journal Year: 2025, Volume and Issue: 17(3)

Published: March 1, 2025

Abstract Realistic simulation of leaf photosynthetic and respiratory processes is needed for accurate prediction the global carbon cycle. These two systematically acclimate to long‐term environmental changes by adjusting traits (e.g., maximum capacity at 25°C ( V cmax,25 ) respiration rate R 25 )) following increasingly well‐understood principles. While some land surface models (LSMs) now account thermal acclimation, they do so assigning empirical parameterizations individual plant functional types (PFTs). Here, we have implemented an Eco‐Evolutionary Optimality (EEO)‐based scheme represent universal acclimation photosynthesis multiple effects, that therefore requires no PFT‐specific parameterizations, in a standard version widely used LSM, Noah MP. We evaluated model performance with trait data from 5‐year experiment extensive field measurements, flux measurements FLUXNET2015. show observed vary substantially both temporally spatially within same PFT C.V. >20%). Our EEO‐based captures 62% temporal 70% spatial variations (73% 54% ). The underestimates gross primary production 10% versus 2% generates larger spread r (correlation coefficient) across sites (0.79 ± 0.16 vs. 0.84 0.1, mean S.D.). greatly overestimates canopy (bias: ∼200% 8% EEO scheme), resulting less CO 2 uptake terrestrial ecosystems. approach thus simulates climate‐carbon coupling more realistically, fewer parameters.

Language: Английский

Citations

0
Correction of crop water deficit indicators based on time-lag effects for improved farmland water status assessment DOI Creative Commons
Yujin Wang, Zhitao Zhang, Yinwen Chen

et al.

Agricultural Water Management, Journal Year: 2025, Volume and Issue: 313, P. 109480 - 109480

Published: April 15, 2025

Language: Английский

Citations

0
Energy-Efficient Technologies and Strategies for Feasible and Sustainable Plant Factory Systems DOI Open Access
Hong‐Seok Mun, Eddiemar B. Lagua, Sung Joo Hong

et al.

Sustainability, Journal Year: 2025, Volume and Issue: 17(7), P. 3259 - 3259

Published: April 6, 2025

The challenge of meeting the increasing global food demand has driven a shift toward controlled-environment agriculture, particularly in plant factories. However, high energy consumption associated with these systems raises concerns about their long-term sustainability and economic feasibility. A comprehensive review was conducted to identify existing potential technologies strategies that can enhance efficiency Data regarding environmental conditions, efficiency, water space were also extracted facilitate comparison across studies. Findings indicate optimizing crop yields reducing are key improving These be achieved by integrating advanced control technologies, energy-efficient system designs, modular factory configurations tailored local climatic effective management practices. While adopting renewable alone is insufficient meet total demands, it significantly reduces costs carbon emissions. Furthermore, strategically factories other industries will promote efficient use residual resources, fostering circular economy enhancing resource within broader framework. insights provided this contribute developing sustainable economically viable systems, supporting future advancements agriculture.

Language: Английский

Citations

0
Leaf warming in the canopy of mature tropical trees reduced photosynthesis due to downregulation of photosynthetic capacity and reduced stomatal conductance DOI
Kristine Y. Crous, Kali B. Middleby, Alexander W. Cheesman

et al.

New Phytologist, Journal Year: 2024, Volume and Issue: unknown

Published: Dec. 7, 2024

Summary Tropical forests play a large role in the global carbon cycle by annually absorbing 30% of our annual emissions. However, these have evolved under relatively stable temperature conditions and may be sensitive to current climate warming. Few experiments investigated effects warming on large, mature trees better understand how higher temperatures affect situ . We targeted four tree species ( Endiandra microneura , Castanospermum australe Cleistanthus myrianthus Myristica globosa ) Australian tropical rainforest warmed leaves canopy 4°C for 8 months. measured response curves photosynthesis respiration, determined critical chloroplast function based Chl fluorescence. Both stomatal conductance were strongly reduced 48 35%, respectively, with While was likely vapour pressure deficit, biochemistry responded via V cmax25 (−28%) J max25 (−29%). There no shift T opt photosynthesis. Concurrently, respiration rates at common did not change warming, suggesting limited respiratory thermal acclimation. This combination physiological responses leaf suggest sink future forests.

Language: Английский

Citations

3
Hydrogen isotope fractionation in plants with C3, C4, and CAM CO2 fixation DOI Creative Commons
Philipp Schuler,

Oliver Rehmann,

Valentina Vitali

et al.

New Phytologist, Journal Year: 2024, Volume and Issue: 244(2), P. 477 - 495

Published: Aug. 22, 2024

Summary Measurements of stable isotope ratios in organic compounds are widely used tools for plant ecophysiological studies. However, the complexity processes involved shaping hydrogen values (δ 2 H) carbohydrates has limited its broader application. To investigate underlying biochemical responsible H fractionation among water, sugars, and cellulose leaves, we studied three main CO fixation pathways (C 3 , C 4 CAM) their response to changes temperature vapor pressure deficit (VPD). We show significant differences autotrophic (ε A ) from water sugar air VPD. The strong depleting ε plants is likely driven by photosynthetic + production within thylakoids, a reaction that spatially separated strongly reduced CAM plants, leading absence depletion latter two types. By contrast, found heterotrophic H‐fractionation was very similar plant's metabolism, rather than isotopic exchange with leaf water. Our study offers new insights into drivers carbohydrates.

Language: Английский

Citations

1
Ecotypic Variation in Leaf Thermoregulation and Heat Tolerance but Not Thermal Safety Margins in Tropical Trees DOI Creative Commons
Kali B. Middleby, Alexander W. Cheesman,

Richard Hopkinson

et al.

Plant Cell & Environment, Journal Year: 2024, Volume and Issue: unknown

Published: Sept. 24, 2024

ABSTRACT To avoid reaching lethal temperatures during periods of heat stress, plants may acclimate either their biochemical thermal tolerance or leaf morphological and physiological characteristics to reduce temperature ( T ). While from warmer environments have a greater capacity regulate , the extent intraspecific variation contribution provenance is relatively unexplored. We tested whether upland lowland provenances four tropical tree species grown in common garden differed safety margins by measuring traits, midday leaf‐to‐air differences (∆ ) critical defined chlorophyll fluorescence crit Provenance was species‐ trait‐specific. Higher ∆ were observed for Terminalia microcarpa Castanospermum australe with no effects other two species. Within‐species covariation led convergence across provenances. future studies should expand number investigated, our findings suggest that not differ substantially vulnerability as determined margins, despite operating .

Language: Английский

Citations

0
Vapor-pressure-deficit-controlled temperature response of photosynthesis in tropical trees DOI Creative Commons
Chinedu Emmanuel Eze, Klaus Winter, Martijn Slot

et al.

Photosynthetica, Journal Year: 2024, Volume and Issue: 62(3), P. 318 - 325

Published: Oct. 10, 2024

Rising temperatures can affect stomatal and nonstomatal control over photosynthesis, through closure in response to increasing vapor pressure deficit (VPD), biochemical limitations, respectively. To explore the independent effects of temperature VPD, we conducted leaf-level temperature-response measurements while controlling VPD on three tropical tree species. Photosynthesis conductance consistently decreased with whereas photosynthesis typically responded weakly changes when a stable was maintained during measurements, resulting wide parabolic curves. We have shown that negative effect forests across ecologically important ranges does not stem from direct warming processes but indirect warming, VPD. Understanding acclimation potential trees elevated will be critical anticipate consequences global for forests.

Language: Английский

Citations

0