Leaf temperature impacts canopy water use efficiency independent of changes in leaf level water use efficiency

Sexton, Thomas; Steber, Camille M.

doi:10.1016/j.jplph.2020.153357

Cited by 12 publications

(8 citation statements)

References 39 publications

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“…The δ 13 C and the discrimination of community (Δ) is suggested as a sensitive long-term monitoring of plant physiological changes [ 48 ], and the WUEi (at the leaf level, which refers to the water used per unit carbon gain) was derived from plant Δ (Equations 3–5). When a plant faces soil water limiting conditions, a strong increase is shown in VPD and plants close their stomata to reduce transpiration, eventually leading to a lower Ci [ 49 ]. With the stronger stomatal limitation of photosynthesis, the leaves or needles will exhibit a low Ci/Ca and a reduced discrimination, along with an improved WUEi [ 50 ].…”

Section: Discussionmentioning

confidence: 99%

Biomass, Carbon and Nitrogen Partitioning and Water Use Efficiency Differences of Five Types of Alpine Grasslands in the Northern Tibetan Plateau

Cheng

Zhang

et al. 2022

IJERPH

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(1) Background: Grassland covers most areas of the northern Tibetan Plateau along with important global terrestrial carbon (C) and nitrogen (N) pools, so there is a need to better understand the different alpine grassland growth associated with ecosystem C, N storage and water use efficiency (WUE). (2) Methods: The plant biomass and C, N concentrations, stocks and vegetation WUE of five kinds of alpine grassland types were investigated in northern Tibetan Plateau. (3) Results: The results showed that there were significant differences among five types of alpine grasslands in aboveground biomass (AGB), belowground biomass (BGB), total biomass (TB) and root:shoot (R/S) ratio while the highest value of different indices was shown in alpine meadow type (AM). The AGB and BGB partitioning results significantly satisfied the allometric biomass partitioning theory. The C, N concentrations and C/N of the vegetation in AGB and BGB showed significant grassland type differences. The highest C, N stocks of BGB were in AM which was almost six or seven times more than the C, N stocks of AGB in alpine desert type (AD). There were significant differences in δ13C and intrinsic water use efficiency (WUEi) under five alpine grassland types while the highest mean values of foliar δ13C and WUEi were in AD. Significant negative correlations were found between WUEi and C, N concentrations, C/N of AGB and soil water content (SWC) while the correlation with BGB C/N was not significant. For AGB, BGB, TB and R/S, there were positive correlations with C, N concentrations of AGB, BGB and SWC while it had significant negative correlations with C/N of BGB. (4) Conclusions: With regard to its types, it is suggested that the AM or AS may be an actively growing grassland type in the northern Tibetan Plateau.

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Section: Discussionmentioning

confidence: 99%

Biomass, Carbon and Nitrogen Partitioning and Water Use Efficiency Differences of Five Types of Alpine Grasslands in the Northern Tibetan Plateau

Cheng

Zhang

et al. 2022

IJERPH

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“…Employing CID as a proxy of TE has limitations in identifying genotypes with sustained carbon fixation capacity as it does not provide insights on the relative contributions of A and T , but rather integrates the effects of stomatal and nonstomatal inhibitions into a single value (Farquhar & Richards, 1984; Condon et al ., 2002; Sexton et al ., 2021). Furthermore, since the heritability of CID significantly decreases under dry conditions (Richards, 2022), breeding selection criteria are generally constrained to performance under well‐irrigated conditions, thus overlooking the negative impacts on carbon fixation capacity under drought stress.…”

Section: New Frontiers For Improving Transpiration Efficiencymentioning

confidence: 99%

Back to the future for drought tolerance

Guadarrama‐Escobar,

Hunt,

Gurung

et al. 2024

New Phytologist

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SummaryGlobal agriculture faces increasing pressure to produce more food with fewer resources. Drought, exacerbated by climate change, is a major agricultural constraint costing the industry an estimated US$80 billion per year in lost production. Wild relatives of domesticated crops, including wheat (Triticum spp.) and barley (Hordeum vulgare L.), are an underutilized source of drought tolerance genes. However, managing their undesirable characteristics, assessing drought responses, and selecting lines with heritable traits remains a significant challenge. Here, we propose a novel strategy of using multi‐trait selection criteria based on high‐throughput spectral images to facilitate the assessment and selection challenge. The importance of measuring plant capacity for sustained carbon fixation under drought stress is explored, and an image‐based transpiration efficiency (iTE) index obtained via a combination of hyperspectral and thermal imaging, is proposed. Incorporating iTE along with other drought‐related variables in selection criteria will allow the identification of accessions with diverse tolerance mechanisms. A comprehensive approach that merges high‐throughput phenotyping and de novo domestication is proposed for developing drought‐tolerant prebreeding material and providing breeders with access to gene pools containing unexplored drought tolerance mechanisms.

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“…Thermal imaging has been widely used to characterize the plants subjected to water stress [27][28][29]. In recent years, canopy temperature has been evaluated through thermal cameras coupled in unmanned aerial vehicles (UAVs) [30], which is able to assess several genotypes or different crops at the same time under different levels of water stress, and the data obtained are related with stomatal opening, biomass production and water use efficiency [31,32]. It is known that leaf temperature is altered via stomatal opening and transpiration rate: the temperature rises as the stomata closes under water stress [33].…”

Section: Introductionmentioning

confidence: 99%

“…In addition, canopy temperature is related to leaf transpiration cooling and water relations in plants [31]. Additionally, it has been suggested that a lower canopy temperature increases water use efficiency and above-ground biomass production, in addition to productivity [32]. Several authors have found correlations between canopy temperature and physiological parameters, such as photosynthesis and transpiration rates and stomatal conductance, for several species such as rice, soybean, maize and wheat [34][35][36][37].…”

Section: Introductionmentioning

confidence: 99%

Use of Thermography to Evaluate Alternative Crops for Off-Season in the Cerrado Region

Silva

Ramos

Ribeiro

et al. 2023

Plants

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Future predictions due to climate change are of decreases in rainfall and longer drought periods. The search for new tolerant crops is an important strategy. The objective of this study was to evaluate the effect of water stress on the physiology and productivity of crops with potential for growing in the off-season period in the Cerrado, and evaluate correlations with the temperature of the canopy obtained by means of thermography. The experiment was conducted under field conditions, with experimental design in randomized blocks, in a split-plot scheme and four replications. The plots were: common bean (Phaseolus vulgaris); amaranth (Amaranthus cruentus); quinoa (Chenopodium quinoa); and buckwheat (Fagopyrum esculentum). The subplots were composed of four water regimes: maximum water regime (WR 535 mm), high-availability regime (WR 410 mm), off-season water regime (WR 304 mm) and severe water regime (WR 187 mm). Under WR 304 mm, the internal concentration of CO2 and photosynthesis were reduced by less than 10% in amaranth. Common bean and buckwheat reduced 85% in photosynthesis. The reduction in water availability increased the canopy temperature in the four crops and, in general, common bean was the most sensitive species, while quinoa had the lowest canopy temperatures. Furthermore, canopy temperature correlated negatively with grain yield, biomass yield and gas exchange across all plant species, thus thermal imaging of the canopy represents a promising tool for monitoring crop productivity for farmers, For the identification of crops with high water use management for research.

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Leaf temperature impacts canopy water use efficiency independent of changes in leaf level water use efficiency

Cited by 12 publications

References 39 publications

Biomass, Carbon and Nitrogen Partitioning and Water Use Efficiency Differences of Five Types of Alpine Grasslands in the Northern Tibetan Plateau

Biomass, Carbon and Nitrogen Partitioning and Water Use Efficiency Differences of Five Types of Alpine Grasslands in the Northern Tibetan Plateau

Back to the future for drought tolerance

Use of Thermography to Evaluate Alternative Crops for Off-Season in the Cerrado Region

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