The effect of vapour pressure deficit on stomatal conductance, sap pH and leaf-specific hydraulic conductance in<i>Eucalyptus globulus</i>clones grown under two watering regimes

Hernandez, Maria Jose; Montes, Fernando; Ruiz, Federico; López, Gustavo; Pita, Pilar

doi:10.1093/aob/mcw031

Cited by 14 publications

(11 citation statements)

References 42 publications

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“…RWC c is a notable indicator of the leaves' water state under severe water stress conditions. Water state is closely related to cell turgor and, therefore, it accurately reflects the balance between internal water content, water supply to the leaf and transpiration rate, as well as leaf dehydration tolerance [60,61]. In our study, the seasonal development varied between a minimum of 73.2% (leaves developed in autumn and winter) and a maximum of 82.9% (developed in spring), presenting no significant differences between those developed in spring and in summer.…”

Section: Cuticular Transpiration and Slamentioning

confidence: 58%

Variability and Plasticity in Cuticular Transpiration and Leaf Permeability Allow Differentiation of Eucalyptus Clones at an Early Age

Carignato

Vázquez‐Piqué

Tapias

et al. 2019

Forests

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Background and Objectives. Water stress is a major constraining factor of Eucalyptus plantations’ growth. Within a genetic improvement program, the selection of genotypes that improve drought resistance would help to improve productivity and to expand plantations. Leaf characteristics, among others, are important factors to consider when evaluating drought resistance evaluation, as well as the clone’s ability to modify leaf properties (e.g., stomatal density (d) and size, relative water content at the time of stomatal closure (RWCc), cuticular transpiration (Ec), specific leaf area (SLA)) according to growing conditions. Therefore, this study aimed at analyzing these properties in nursery plants of nine high-productivity Eucalyptus clones. Material and Methods: Five Eucalyptus globulus Labill. clones and four hybrids clones (Eucalyptus urophylla S.T. Blake × Eucalyptus grandis W. Hill ex Maiden, 12€; Eucalyptus urograndis × E. globulus, HE; Eucalyptus dunnii Maiden–E. grandis × E. globulus, HG; Eucalyptus saligna Sm. × Eucalyptus maidenii F. Muell., HI) were studied. Several parameters relating to the aforementioned leaf traits were evaluated for 2.5 years. Results: Significant differences in stomatal d and size, RWCc, Ec, and SLA among clones (p < 0.001) and according to the dates (p < 0.001) were obtained. Each clone varied seasonally the characteristics of its new developing leaves to acclimatize to the growth conditions. The pore opening surface potential (i.e., the stomatal d × size) did not affect transpiration rates with full open stomata, so the water transpired under these conditions might depend on other leaf factors. The clones HE, HG, and 12€ were the ones that differed the most from the drought resistant E. globulus control clone (C14). Those three clones showed lower leaf epidermis impermeability (HE, HG, 12€), higher SLA (12€, HG), and lower stomatal control under moderate water stress (HE, HG) not being, therefore, good candidates to be selected for drought resistance, at least for these measured traits. Conclusions: These parameters can be incorporated into genetic selection and breeding programs, especially Ec, SLA, RWCc, and stomatal control under moderate water stress.

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Section: Cuticular Transpiration and Slamentioning

confidence: 58%

Variability and Plasticity in Cuticular Transpiration and Leaf Permeability Allow Differentiation of Eucalyptus Clones at an Early Age

Carignato

Vázquez‐Piqué

Tapias

et al. 2019

Forests

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“…This study shows that Pseudomonas strains N33 and M25 (individually or co-inoculated) can influence water management by stimulating plants to deploy an early response to water deficit and closing stomata. Decreasing g s is a common strategy to avoid excessive water loss by transpiration in eucalypts 14 , 16 , 48 , including E. grandis 17 , 22 . This mechanism could be related to the higher RWC observed in leaves of inoculated plants after recovery from drought stress.…”

Section: Discussionmentioning

confidence: 99%

“…Under sudden and severe water deficit, tree species may lose all their leaves 16 , while maintaining the capacity of resprouting and generating new leaves when water is provided again. In eucalypts, these types of plastic responses have been shown to depend on hydraulic properties 14 , 48 . When drought stress was imposed rapidly in our growth chamber assay, we observed a severe defoliation followed by a rapid recover of leaf area after rewatering.…”

Section: Discussionmentioning

confidence: 99%

Growth promotion and protection from drought in Eucalyptus grandis seedlings inoculated with beneficial bacteria embedded in a superabsorbent polymer

Chaín

Tubert

Graciano

et al. 2020

Sci Rep

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Eucalyptus grandis is a globally important tree crop. Greenhouse-grown tree seedlings often face water deficit after outplanting to the field, which can affect their survival and establishment severely. This can be alleviated by the application of superabsorbent hydrophilic polymers (SAPs). Growth promoting bacteria can also improve crop abiotic stress tolerance; however, their use in trees is limited, partly due to difficulties in the application and viability loss. In this work, we evaluated the improvement of drought tolerance of E. grandis seedlings by inoculating with two Pseudomonas strains (named M25 and N33), carried by an acrylic-hydrocellulosic SAP. We observed significant bacterial survival in the seedling rhizosphere 50 days after inoculation. Under gradual water deficit conditions, we observed a considerable increase in the water content and wall elasticity of M25-inoculated plants and a trend towards growth promotion with both bacteria. Under rapid water deficit conditions, which caused partial defoliation, both strains significantly enhanced the formation of new leaves, while inoculation with M25 reduced the transpiration rate. Co-inoculation with M25 and N33 substantially increased growth and photosynthetic capacity. We conclude that the selected bacteria can benefit E. grandis early growth and can be easily inoculated at transplant by using an acrylic-hydrocellulosic SAP.

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“…In this study, SWP is driven by VPD. The stomatal closure, and thus SWP, is encouraged by high VPD (Hernandez et al, 2016). The sensors for MXTD monitoring were installed without repetitions.…”

Section: Stem Water Potential and Trunk Diameter Growthmentioning

confidence: 99%

Effects of Different Crop Loads on Physiological, Yield and Fruit Quality of ‘Joya^TM’ Apple Trees: High Crop Load Decreases Maximum Daily Trunk Diameter and Does Not Affect Stem Water Potential

Atay

Crété²,

Loubet³

et al. 2021

International Journal of Fruit Science

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This study aimed to evaluate the effects of different crop load levels on apple trees' yield and physiological characteristics, emphasizing the relationship between stem water potential and crop load and the link between trunk diameter growth and crop load. It was conducted in 2014 at Station Expérimentale Fruits et Légumes (SUDEXPE-CEHM) in Southern France. The 'Joya TM ' apple on Pajam-1 rootstock was used as the plant material. Trees were subjected to hand thinning to obtain four final crop load levels as high (100%; 10 fruit/cm 2 of branch cross-sectional area (BCSA)), medium-high (75%; 7.5 fruit/cm 2 of BCSA), medium-low (50%; 5 fruit/cm 2 of BCSA) and low (25%; 2.5 fruit/cm 2 of BCSA). The four crop load levels were set up in a randomized block design with four replications, and each plot was formed of five uniform trees. Stem water potential was weakly affected by crop load but was mainly driven by vapor pressure deficit. The maximum daily trunk diameter, by and large, reduced while crop load level increased. The increase in crop load level was negatively related to fruit size, acidity and soluble solids content. Crop load did not affect bitter pit incidence. However, in parallel to the increasing crop load level, cumulative yield, yield efficiency and water productivity increased.

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The effect of vapour pressure deficit on stomatal conductance, sap pH and leaf-specific hydraulic conductance inEucalyptus globulusclones grown under two watering regimes

Cited by 14 publications

References 42 publications

Variability and Plasticity in Cuticular Transpiration and Leaf Permeability Allow Differentiation of Eucalyptus Clones at an Early Age

Variability and Plasticity in Cuticular Transpiration and Leaf Permeability Allow Differentiation of Eucalyptus Clones at an Early Age

Growth promotion and protection from drought in Eucalyptus grandis seedlings inoculated with beneficial bacteria embedded in a superabsorbent polymer

Effects of Different Crop Loads on Physiological, Yield and Fruit Quality of ‘Joya^TM’ Apple Trees: High Crop Load Decreases Maximum Daily Trunk Diameter and Does Not Affect Stem Water Potential

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The effect of vapour pressure deficit on stomatal conductance, sap pH and leaf-specific hydraulic conductance inEucalyptus globulusclones grown under two watering regimes

Cited by 14 publications

References 42 publications

Variability and Plasticity in Cuticular Transpiration and Leaf Permeability Allow Differentiation of Eucalyptus Clones at an Early Age

Variability and Plasticity in Cuticular Transpiration and Leaf Permeability Allow Differentiation of Eucalyptus Clones at an Early Age

Growth promotion and protection from drought in Eucalyptus grandis seedlings inoculated with beneficial bacteria embedded in a superabsorbent polymer

Effects of Different Crop Loads on Physiological, Yield and Fruit Quality of ‘JoyaTM’ Apple Trees: High Crop Load Decreases Maximum Daily Trunk Diameter and Does Not Affect Stem Water Potential

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Effects of Different Crop Loads on Physiological, Yield and Fruit Quality of ‘Joya^TM’ Apple Trees: High Crop Load Decreases Maximum Daily Trunk Diameter and Does Not Affect Stem Water Potential