Dataset Information

Nighttime transpiration represents a negligible part of water loss and does not increase the risk of water stress in grapevine.

ABSTRACT: Nighttime transpiration has been previously reported as a significant source of water loss in many species; however, there is a need to determine if this trait plays a key role in the response to drought. This study aimed to determine the magnitude, regulation and relative contribution to whole plant water-use, of nighttime stomatal conductance (g_night ) and transpiration (E_night ) in grapevine (Vitis vinifera L.). Our results showed that nighttime water loss was relatively low compared to daytime transpiration, and that decreases in soil and plant water potentials were mainly explained by daytime stomatal conductance (g_day ) and transpiration (E_day ). Contrary to E_day , E_night did not respond to VPD and possible effects of an innate circadian regulation were observed. Plants with higher g_night also exhibited higher daytime transpiration and carbon assimilation at midday, and total leaf area, suggesting that increased g_night may be linked with daytime behaviors that promote productivity. Modeling simulations indicated that g_night was not a significant factor in reaching critical hydraulic thresholds under scenarios of either extreme drought, or time to 20% of soil relative water content. Overall, this study suggests that g_night is not significant in exacerbating the risk of water stress and hydraulic failure in grapevine.

SUBMITTER: Dayer S

PROVIDER: S-EPMC7894480 | biostudies-literature | 2021 Feb

REPOSITORIES: biostudies-literature

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Nighttime transpiration represents a negligible part of water loss and does not increase the risk of water stress in grapevine.

Dayer Silvina S Herrera José Carlos JC Dai Zhanwu Z Burlett Régis R Lamarque Laurent J LJ Delzon Sylvain S Bortolami Giovanni G Cochard Hervé H Gambetta Gregory A GA

Plant, cell & environment 20201105 2

Nighttime transpiration has been previously reported as a significant source of water loss in many species; however, there is a need to determine if this trait plays a key role in the response to drought. This study aimed to determine the magnitude, regulation and relative contribution to whole plant water-use, of nighttime stomatal conductance (g<sub>night</sub> ) and transpiration (E<sub>night</sub> ) in grapevine (Vitis vinifera L.). Our results showed that nighttime water loss was relatively ...[more]

PMID: 33099776

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Project description:BackgroundGrapevine metabolism in response to water deficit was studied in two cultivars, Shiraz and Cabernet Sauvignon, which were shown to have different hydraulic behaviors (Hochberg et al. Physiol. Plant. 147:443-453, 2012).ResultsProgressive water deficit was found to effect changes in leaf water potentials accompanied by metabolic changes. In both cultivars, but more intensively in Shiraz than Cabernet Sauvignon, water deficit caused a shift to higher osmolality and lower C/N ratios, the latter of which was also reflected in marked increases in amino acids, e.g., Pro, Val, Leu, Thr and Trp, reductions of most organic acids, and changes in the phenylpropanoid pathway. PCA analysis showed that changes in primary metabolism were mostly associated with water stress, while diversification of specialized metabolism was mostly linked to the cultivars. In the phloem sap, drought was characterized by higher ABA concentration and major changes in benzoate levels coinciding with lower stomatal conductance and suberinization of vascular bundles. Enhanced suberin biosynthesis in Shiraz was reflected by the higher abundance of sap hydroxybenzoate derivatives. Correlation-based network analysis revealed that compared to Cabernet Sauvignon, Shiraz had considerably larger and highly coordinated stress-related changes, reflected in its increased metabolic network connectivity under stress. Network analysis also highlighted the structural role of major stress related metabolites, e.g., Pro, quercetin and ascorbate, which drastically altered their connectedness in the Shiraz network under water deficit.ConclusionsTaken together, the results showed that Vitis vinifera cultivars possess a common metabolic response to water deficit. Central metabolism, and specifically N metabolism, plays a significant role in stress response in vine. At the cultivar level, Cabernet Sauvignon was characterized by milder metabolic perturbations, likely due to a tighter regulation of stomata upon stress induction. Network analysis was successfully implemented to characterize plant stress molecular response and to identify metabolites with a significant structural and biological role in vine stress response.

Dataset Information

Nighttime transpiration represents a negligible part of water loss and does not increase the risk of water stress in grapevine.

Publications

Nighttime transpiration represents a negligible part of water loss and does not increase the risk of water stress in grapevine.

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