Abscisic Acid Down-Regulates Hydraulic Conductance of Grapevine Leaves in Isohydric Genotypes Only

Coupel‐Ledru, Aude; Tyerman, Stephen D.; Masclef, Diane; Lebon, Éric; Christophe, Angélique; Edwards, Everard; Simonneau, Thierry

doi:10.1104/pp.17.00698

Cited by 53 publications

(52 citation statements)

References 79 publications

(100 reference statements)

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“…7). This fits with a higher sensitivity of Kleaf to ABA fed via the petiole in Grenache compared to Syrah, as observed by Coupel-Ledru et al (2017), although we did not observe a relationship between Kleaf and [ABA]xylem. Tardieu and Simonneau (1998) suggested that isohydric behaviour could be related to stomatal sensitivity to ABA being modulated by Ψleaf or E, while anisohydric behaviour could be due to a single relationship between gs and ABA.…”

Section: Anisohydric Behaviour Of Syrah Was Observed In the Present Ssupporting

confidence: 87%

“…There is much interest in these different behaviours since agriculturally important plants with different degrees of isohydry/anisohydry can have very different water demands under certain environmental conditions and hence require different management strategies. The hydraulic and gas exchange properties of plants that confer either isohydry or anisohydry are still relatively poorly understood though there is evidence to indicate that the response of Kleaf to ABA may be a key feature (Coupel-Ledru et al, 2017). In this study, we investigated additional features of the mechanisms that may account for the differences in isohydry by exploring how both, roots and shoot hydraulics, gas exchange, AQP expression and ABA may be involved.…”

Section: Discussionmentioning

confidence: 99%

“…Schultz concluded that Grenache was more isohydric than Syrah as a result of stronger control over gs and Kleaf. Grapevine has since served as an important model plant to study iso/anisohydric behaviours and several studies have used the cultivars Grenache and Syrah as models for isohydric and anisohydric behaviour, respectively (Coupel-Ledru et al, 2014, Coupel-Ledru et al, 2017, Gerzon et al, 2015, Prieto et al, 2010, Scharwies & Tyerman, 2016, Schultz, 2003, Soar et al, 2006.…”

Section: Discussionmentioning

confidence: 99%

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A comparison of root and shoot hydraulics, aquaporin expression and leaf gas exchange between two grapevine cultivars reveals differences in hydraulic control mediated by aquaporins

Dayer¹,

Ramesh

et al. 2017

Preprint

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Hydraulics of plants that take different strategies of stomatal control under water stress are still relatively poorly understood. Here we explore how root and shoot hydraulics, gas exchange, aquaporin expression and abscisic acid (ABA) concentration in leaf xylem sap ([ABA]xylem) may be involved and coordinated. A comparison in responses to mild water stress and ABA application was made between two cultivars of Vitis vinifera L. previously classified as isohydric (Grenache) and anisohydric (Syrah). Grenache showed stronger adjustments of leaf, plant, and root hydraulic conductances to decreased soil moisture and a steeper correlation of stomatal conductance (gs) to [ABA]xylem than Syrah resulting in greater conservation of soil moisture, but not necessarily more isohydric behaviour. Under well-watered conditions, changes in vapour pressure deficit (VPD) had a strong influence on gs in both cultivars with adjustments of leaf hydraulic conductance. Grenache was more sensitive to decreases in soil water availability compared to Syrah that rather responded to VPD. There were stronger correlations between plant hydraulic parameters and changes in aquaporin gene expression in leaves and roots of Grenache. Overall, the results reinforce the hypothesis that both hydraulic and chemical signals significantly contribute to the differences in water conservation behaviours of the two cultivars.

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Section: Anisohydric Behaviour Of Syrah Was Observed In the Present Ssupporting

confidence: 87%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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A comparison of root and shoot hydraulics, aquaporin expression and leaf gas exchange between two grapevine cultivars reveals differences in hydraulic control mediated by aquaporins

Dayer¹,

Ramesh

et al. 2017

Preprint

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“…Elevated ABA elicited differences in stem and root hydraulic conductivity between the wild type and the transgenic lines, in accordance with the feedback effects described between transpiration and plant hydraulic conductance (Tardieu & Parent, ; Vandeleur et al, ). Recent works have shown reductions in leaf hydraulic conductivity of detached leaves fed with exogenous ABA in both Arabidopsis (Pantin et al, ) and grapevine varieties (Coupel‐Ledru et al, ), possibly through the regulation of aquaporin activity in the bundle sheath around leaf veins (Shatil‐Cohen, Attia, & Moshelion, ). An alternative is that the decrease in K s observed in the transgenic sp12 line may be due to the associated lower number of large diameter xylem vessels compared with the wild type (Figure S3), given that hydraulic properties of the xylem network strongly depends on wood anatomical features such as conduit diameter (Tyree & Ewers, ) and that a small increase in vessel diameter results in a large increase in conductivity (Hagen‐Poiseuille law; Kotowska, Hertel, Rajab, Barus, & Schuldt, ; Nobel, ).…”

Section: Discussionmentioning

confidence: 99%

Over‐accumulation of abscisic acid in transgenic tomato plants increases the risk of hydraulic failure

Lamarque

Delzon

Toups

et al. 2020

Plant Cell & Environment

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Climate change threatens food security, and plant science researchers have investigated methods of sustaining crop yield under drought. One approach has been to overproduce abscisic acid (ABA) to enhance water use efficiency. However, the concomitant effects of ABA overproduction on plant vascular system functioning are critical as it influences vulnerability to xylem hydraulic failure. We investigated these effects by comparing physiological and hydraulic responses to water deficit between a tomato (Solanum lycopersicum) wild type control (WT) and a transgenic line overproducing ABA (sp12). Under well‐watered conditions, the sp12 line displayed similar growth rate and greater water use efficiency by operating at lower maximum stomatal conductance. X‐ray microtomography revealed that sp12 was significantly more vulnerable to xylem embolism, resulting in a reduced hydraulic safety margin. We also observed a significant ontogenic effect on vulnerability to xylem embolism for both WT and sp12. This study demonstrates that the greater water use efficiency in the tomato ABA overproducing line is associated with higher vulnerability of the vascular system to embolism and a higher risk of hydraulic failure. Integrating hydraulic traits into breeding programmes represents a critical step for effectively managing a crop's ability to maintain hydraulic conductivity and productivity under water deficit.

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“…Based on the perception of water stress by leaves and roots, different grapevine varieties react differently to water deficits. Some recent studies have attempted to better comprehend the relationships between the stomatal regulation of gas exchange, hydraulic conductivity in roots and shoots, aquaporin expression levels and hormonal signals (mainly ABA, Stoll et al, 2000) under water stress conditions (Coupel-Ledru et al, 2017). Hydraulic segmentation, whereby the risk of hydraulic rupture is shared among plant organs, may also play an important part in the sensitivity of plants to embolism phenomena during drought.…”

Section: B Cavitation Vulnerabilitymentioning

confidence: 99%

The impact of plant water status on the gas exchange, berry composition and wine quality of Chasselas grapes in Switzerland

et al. 2018

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Aims: The aim of this research was to study the physiological and agronomical behaviors (leaf gas exchange, plant vigor, mineral supply, and yield components) of the Chasselas grapevine subjected to different water regimes during the growing season. The resulting grape and wine qualities were also determined.Methods and results: Adult vines of Vitis vinifera L. cv. Chasselas (clone 14/33-4, grafted onto 5BB) were subjected to different water regimes (various levels of irrigation) during the growing season. Physiological indicators were used to monitor the plant water status [the predawn leaf (. Leaf photosynthesis (A) and transpiration (E), stomatal conductance (gs), vulnerability to cavitation, yield parameters, berry composition at harvest, and organoleptic quality of wines were analyzed over a period of eight consecutive years between 2009 and 2016, under the relatively dry conditions of the Canton of Wallis, Switzerland.In non-irrigated vines, the progressively increasing water deficit observed over the season reduced the leaf gas exchange (A and E) and gs. The intrinsic water use efficiency (WUEi, A/gs) increased over the season and was greater in vines that had suffered water restriction than in irrigated vines. The rise in WUEi was correlated with an increase in d13C in the must sugars at harvest. Vulnerability to cavitation (embolism phenomenon) increased with increasing water deficit in the non-irrigated vines with covered soils. A decrease in plant vigor was observed in the vines that had been subjected to water restrictions over multiple years. Moderate water stress during fruit ripening was favorable for sugar accumulation in berries and lowered the contents of total and malic acidity in the musts and the content of available nitrogen (YAN). Overall, the organoleptic characteristics and quality of Chasselas wines were little influenced by the vine water regimes, with the exception of the hot, dry season in 2009 (and, to a lesser degree, in 2011). In those years, the quality of the wines from the irrigated vines, which had not suffered any water stress, received a better appreciation. Bitterness was generally greater in samples from the non-irrigated vineyards that had suffered from drought than in samples from the irrigated vines. No significant differences in the aroma and wine structure were measured during the study period, regardless of the vine irrigation status.Conclusions: The physiological behavior (gas exchange, plant vigor, and mineral supplies) and grape ripening in Chasselas vines were largely dependent on the water supply conditions in the vineyard during the growing season.Significance and impact of the study: Vine water status is a key factor in leaf gas exchange, canopy water use efficiency, berry composition and, lastly, wine quality.

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Abscisic Acid Down-Regulates Hydraulic Conductance of Grapevine Leaves in Isohydric Genotypes Only

Cited by 53 publications

References 79 publications

A comparison of root and shoot hydraulics, aquaporin expression and leaf gas exchange between two grapevine cultivars reveals differences in hydraulic control mediated by aquaporins

A comparison of root and shoot hydraulics, aquaporin expression and leaf gas exchange between two grapevine cultivars reveals differences in hydraulic control mediated by aquaporins

Over‐accumulation of abscisic acid in transgenic tomato plants increases the risk of hydraulic failure

The impact of plant water status on the gas exchange, berry composition and wine quality of Chasselas grapes in Switzerland

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