Stomata conductance as a goalkeeper for increased photosynthetic efficiency

Wang, Yin; Wang, Yizhou; Tang, Yanhong; Zhu, Xin‐Guang

doi:10.1016/j.pbi.2022.102310

Cited by 36 publications

(16 citation statements)

References 57 publications

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“…Given that g s has a substantial impact on A and, consequently, iWUE (McAusland et al ., 2016; Lawson & Vialet‐Chabrand, 2019; Eyland et al ., 2021; Wang et al ., 2022), we employed a dynamic photosynthesis model (Osborne & Sack, 2012; Ozeki et al ., 2022) that integrated GCSC‐ τ ‐based g s dynamics and CO 2 assimilation to predict changes in A of Z. mays . Our results indicate that variations of up to ±15% in GC/SC size had a notable impact on g s (Fig.…”

Section: Resultsmentioning

confidence: 99%

Guard cell and subsidiary cell sizes are key determinants for stomatal kinetics and drought adaptation in cereal crops

Rui,

Chen,

Jing

et al. 2024

New Phytologist

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Summary Climate change‐induced drought is a major threat to agriculture. C4 crops have a higher water use efficiency (WUE) and better adaptability to drought than C3 crops due to their smaller stomatal morphology and faster response. However, our understanding of stomatal behaviours in both C3 and C4 Poaceae crops is limited by knowledge gaps in physical traits of guard cell (GC) and subsidiary cell (SC). We employed infrared gas exchange analysis and a stomatal assay to explore the relationship between GC/SC sizes and stomatal kinetics across diverse drought conditions in two C3 (wheat and barley) and three C4 (maize, sorghum and foxtail millet) upland Poaceae crops. Through statistical analyses, we proposed a GCSC‐τ model to demonstrate how morphological differences affect stomatal kinetics in C4 Poaceae crops. Our findings reveal that morphological variations specifically correlate with stomatal kinetics in C4 Poaceae crops, but not in C3 ones. Subsequent modelling and experimental validation provide further evidence that GC/SC sizes significantly impact stomatal kinetics, which affects stomatal responses to different drought conditions and thereby WUE in C4 Poaceae crops. These findings emphasize the crucial advantage of GC/SC morphological characteristics and stomatal kinetics for the drought adaptability of C4 Poaceae crops, highlighting their potential as future climate‐resilient crops.

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Section: Resultsmentioning

confidence: 99%

Guard cell and subsidiary cell sizes are key determinants for stomatal kinetics and drought adaptation in cereal crops

Rui,

Chen,

Jing

et al. 2024

New Phytologist

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“…Small stomata and high density confer higher stomatal conductance, nutrient uptake efficiency, and photosynthetic rates under adequate water conditions (Hepworth et al, 2015; Tanaka et al, 2013; Wang et al, 2022). Considering its steady HI and early flowering/heading phenotype, the RFS knockout mutant may be suitable for growth in controlled cultivation facilities, where conditions (e.g., temperature, air humidity, light intensity, etc.)…”

Section: Discussionmentioning

confidence: 99%

REGULATOR OF FLOWERING AND STRESS manipulates stomatal density and size in Brachypodium

Ying,

Scheible

2023

Physiologia Plantarum

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Stomata are crucial for gas exchange and water evaporation, and environmental stimuli influence their density (SD) and size (SS). Although genes and mechanisms underlying stomatal development have been elucidated, stress‐responsive regulators of SD and SS are less well‐known. Previous studies have shown that the stress‐inducible Brachypodium RFS (REGULATOR OF FLOWERING AND STRESS, BdRFS) gene affects heading time and enhances drought tolerance by reducing leaf water loss. Here, we report that overexpression lines (OXs) of BdRFS have reduced SD and increased SS, regardless of soil water status. Furthermore, biomass and plant water content of OXs were significantly increased compared to wild type. CRISPR/Cas9‐mediated BdRFS knockout mutant (KO) exhibited the opposite stomatal characteristics and biomass changes. Reverse transcription‐quantitative polymerase chain reaction analysis revealed that expression of BdICE1 was reversely altered in OXs and KO, pointing to a potential cause for the observed changes in stomatal phenotypes. Stomatal and transcriptional changes were not observed in the Arabidopsis rfs double mutant. Taken together, RFS is a novel regulator of SD and SS and is a promising candidate for genetic engineering of climate‐resilient crops.

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“…Based on the path analysis, leaf tissue density had a highly significant negative effect on chlorophylls ( a , b, and total). This may be due to increases in CO 2 diffusion caused by lower leaf tissue density which increases the photosynthesis efficiency 37 , 38 .…”

Section: Discussionmentioning

confidence: 99%

A comprehensive model for predicting the development of defense system of Capparis spinosa L.: a novel approach to assess the physiological indices

Afzali,

Sadeghi,

Taban

2023

Sci Rep

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Capparisspinosa L. (caper) is a halophytic plant that grows in semi-arid or arid environments. The current study used an integrated experimental and computational approach to investigate the network of inter-correlated effective variables on the activity of antioxidant enzymes, proline, and photosynthetic pigments in stressed caper. To investigate the possible relationships among intercorrelated variables and understand the possible mechanisms, predictive regression modelling, principal component analysis (PCA), Pearson's correlation, and path analysis were implemented. PCA successfully discerned different salt ratio- and drought-specific effects in data in the current study, and treatments with higher growth indices are easily recognizable. Different salt ratios did not have a significant effect on the activity of four antioxidant enzymes, proline and photosynthesis pigments content of caper. While at the mean level, the activity of four antioxidant enzymes of SOD, POD, CAT, and APX significantly increased under drought stress by 54.0%, 71.2%, 79.4%, and 117.6%, respectively, compared to 100% FC. The drought stress also significantly increased the content of carotemoid (29.3%) and proline (by 117.7%). Predictive equation models with highly significant R2 were developed for the estimation of antioxidant enzyme activity and proline content (> 0.94) as well as pigments (> 0.58) were developed. Path analysis studies revealed that proline is the most important regressor in four antioxidant enzyme activities, while leaf tissue density was the most effective variable in the case of chlorophylls. Furthermore, the network of intercorrelated variables demonstrated a close relationship between caper's antioxidant defence system, pigments, and morphological parameters under stress conditions. The findings of this study will be a useful guide to caper producers as well as plant ecophysiological researchers.

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Stomata conductance as a goalkeeper for increased photosynthetic efficiency

Cited by 36 publications

References 57 publications

Guard cell and subsidiary cell sizes are key determinants for stomatal kinetics and drought adaptation in cereal crops

Guard cell and subsidiary cell sizes are key determinants for stomatal kinetics and drought adaptation in cereal crops

REGULATOR OF FLOWERING AND STRESS manipulates stomatal density and size in Brachypodium

A comprehensive model for predicting the development of defense system of Capparis spinosa L.: a novel approach to assess the physiological indices

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