Antonio Diaz-Espejo

Antonio Diaz-Espejo
Spanish National Research Council | CSIC · Irrigation and Crop Ecophysiology

About

130
Publications
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6,909
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January 1997 - present
Spanish National Research Council
Position
  • Tenured Scientist

Publications

Publications (130)
Article
Full-text available
The relative contribution of carbon sources generated from leaves and fruits photosynthesis for triacylglycerol biosynthesis in the olive mesocarp and their interaction with water stress, was investigated. With this aim, altered carbon source treatments were combined with different irrigation conditions. A higher decrease in mesocarp oil content wa...
Article
Full-text available
Leaf water potential (ψ leaf), typically measured using the pressure chamber, is the most important metric of plant water status, providing high theoretical value and information content for multiple applications in quantifying critical physiological processes including drought responses. Pressure chamber measurements of ψ leaf (ψ leafPC) are most...
Article
In most fruit tree orchards under localised irrigation, only a fraction of the rhizosphere is wetted by irrigation. As this may reduce growth and production, such that there is a demand for information on the optimum number and location of emitters. In a mature ‘Arbequina’ olive orchard with 1667 trees ha⁻¹, we analysed the impact of applying the s...
Article
Full-text available
Despite the importance of understanding plant growth, the mechanisms underlying how plant and fruit growth declines, during drought remains poorly understood. Specifically, it remains unresolved whether carbon or water factors are responsible for limiting growth as drought progresses. We examine questions regarding the relative importance of water...
Article
Irrigation Advisory Services (IAS) are powerful management instruments aiming to achieve the best efficiency in irrigation water use. So far the literature on farmers’ preferences for a specific scheme design of IAS’ characteristics and the related willingness to pay (WTP) is scant. This study provides evidence on farmers’ preference towards six at...
Article
Olive oil is considered as one of the healthiest oils for human consumption due to its high amount of monounsaturated fats and also to the content of antioxidants, polyphenols and triterpenes. Among these last compounds, the oleanolic acid and maslinic acid are of great interest because they are shown to have anti-tumoral and anti-cancer activity....
Article
Increasing the efficiency of on-farm water use requires wise decisions on the irrigation system, the irrigation strategy and the method to schedule irrigation, among other factors related to water management. Since the early 2000s, the water productivity approach has been widely used to address this issue. It provides useful indicators to both the...
Article
Full-text available
Effective study and management of crops and forests would benefit greatly from useful plant-based indicators of the biological controls on evapotranspiration, and particularly stomatal conductance (g s ). Given the strong influence of g s on bulk leaf water potential and turgor pressure (P), in vivo measurement of P may provide useful information a...
Article
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Chloride (Cl⁻) has been recently described as a beneficial macronutrient, playing specific roles in promoting plant growth and water use efficiency (WUE). However, it is still unclear how Cl⁻ could be beneficial, especially in comparison with nitrate (NO3⁻), an essential macronutrient that shares with Cl⁻ similar physical and osmotic properties, as...
Cover Page
Full-text available
Chloride (Cl−) nutrition at macronutrient levels significantly increases the size of leaf cells, resulting in a reduction in stomatal density and, therefore, conductance (gs). At the same time, Cl− improves mesophyll diffusion conductance to CO2 (gm) due, at least in part, to increased surface area of chloroplasts exposed to the intercellular airsp...
Article
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The hydraulic traits of plants, or the efficiency of water transport throughout the plant hydraulic system, could help to anticipate the impact of climate change and improve crop productivity. However, the mechanisms explaining the role of hydraulic traits on plant photosynthesis and thus, plant growth and yield, are just beginning to emerge. We co...
Data
Growth and water use traits of wild olive genotypes. Water consumption relative to leaf fresh weight (FW), total FW, shoot FW, root FW, and the root vs. shoot (R/S) biomass ratio was quantified in potted seedlings during the 2015 screening in selected genotypes from the subspecies europaea (ACZ8, ARC1, ACZ27, APR1, AJA18, AJA4, AJA1, ACO15, AJA6, A...
Article
Yield, the final goal in agricultural systems, is highly determined by fruit growth. However, most works on deficit irrigation did not consider the physiology and dynamics of fruit growth. In this study, we explore the effect of water relations between leaves and fruits on fruit growth in well-watered (WW) and water-stressed (WS) trees in a super-h...
Article
The effect of three irrigation strategies on the olive oil quality in a hedgerow ‘Arbequina’ olive orchard with 1667 trees ha⁻¹ was assessed. Olive trees were fully irrigated, with the crop water demand replaced through daily irrigation (FI), or irrigated according to two regulated deficit irrigation (RDI) treatments, in which the total irrigation...
Article
Water scarcity is the most limiting factor in many irrigated areas of Mediterranean countries such as South Spain. Olive growing has been traditionally associated to rain-fed agriculture, although irrigation and practices related to intensive agriculture have been progressively introduced, requiring a more precise irrigation scheduling to save wate...
Article
An experiment was carried out to assess the performance of an automatic irrigation system based on remotely-sensed soil moisture measurements in blueberries grown in sandy soil under plastic tunnels. The system uses the information provided by soil moisture sensors installed at three soil depths (10, 20 and 30 cm) and user-defined irrigation set-po...
Article
Regulated deficit irrigation (RDI) reduces leaf area, which is advantageous for fruit tree orchards with high plant densities to increase their long-term productive life. However, RDI also decreases fruit yield. To establish an optimum irrigation level to control tree vegetative growth without severely penalizing fruit yield it is necessary to anal...
Article
Background: Regulated deficit irrigation (RDI) is used in hedgerow olive orchards to achieve a sustainable balance between water savings, tree vigor and oil production. Its effects on the presence of compounds responsible for the taste of the oil and its nutritional value are controversial. This three years'-work was made in an 'Arbequina' orchard...
Article
Full-text available
Reduced stomatal conductance (gs) during soil drought in angiosperms may result from effects of leaf turgor on stomata, and/or factors that do not directly depend on leaf turgor, including root-derived abscisic acid (ABA) signals. To quantify the roles of leaf-turgor-mediated and leaf-turgor-independent mechanisms in gs decline during drought, we m...
Article
Full-text available
Redox regulation plays a central role in the adaptation of chloroplast metabolism to light. Extensive biochemical analyses in vitro have identified f-type thioredoxins (Trxs) as the most important catalysts for light-dependent reduction and activation of the enzymes of the Calvin–Benson cycle. However, the precise function of type f Trxs in vivo an...
Article
The decrease of stomatal conductance (gs) is one of the prime responses to water shortage and the main determinant of yield limitation in fruit trees. Understanding the mechanisms related to stomatal closure in response to imposed water stress is crucial for correct irrigation management. The loss of leaf hydraulic functioning is considered as one...
Article
A study was conducted in a hedgerow olive orchard (SW Spain) to assess the capability of the HYDRUS 2D/3D model in predicting seasonal soil water dynamics in a well-watered (full irrigation, FI) and two regulated deficit irrigated plots (60RDI and 30RDI) differing in the timing and level of water stress imposed. The simulated soil water balance com...
Article
‘White oaks’—one of the main groups of the genus Quercus L.—are represented in western Eurasia by the ‘roburoid oaks’, a deciduous and closely related genetic group that should have an Arcto-Tertiary origin under temperate-nemoral climates. Nowadays, roburoid oak species such as Quercus robur L. are still present in these temperate climates in Euro...
Article
Water limitation is a major global constraint for plant productivity that is likely to be exacerbated by climate change. Hence, improving plant water use efficiency (WUE) has become a major goal for the near future. At the leaf level, WUE is the ratio between photosynthesis and transpiration. Maintaining high photosynthesis under water stress, whil...
Article
Full-text available
The control of plant transpiration by stomata under water stress and recovery conditions is of paramount importance for plant performance and survival. Although both chemical and hydraulic signals emitted within a plant are considered to play a major role in controlling stomatal dynamics, they have rarely been assessed together. The aims of this st...
Article
Full-text available
Different methods have been devised to analyze vulnerability to cavitation of plants. Although a good agreement between them is usually found, some discrepancies have been reported when measuring samples from long-vesseled species. The aim of this study was to evaluate possible artefacts derived from different methods and sample sizes. Current-year...
Article
Changes in net CO2 assimilation rate (A) are often partitioned into contributions from changes in different variables using an approach that is based on an expression from calculus: namely the definition of the exact differential of A, which states that an infinitesimal change in A (dA) is equal to the sum of infinitesimal changes in each of the un...
Article
The climate change conditions predicted for the end of the current century are expected to have an impact on the performance of plants under natural conditions. The variables which are foreseen to have a larger effect are increased CO2 concentration and temperature. Although it is generally considered CO2 assimilation rate could be increased by the...
Article
4 paginas.-- 3 figuras.-- 23 referencias.-- Supporting Informationhttp://onlinelibrary.wiley.com/doi/10.1111/nph.13018/suppinfo or http://onlinelibrary.wiley.com/store/10.1111/nph.13018/asset/supinfo/nph13018-sup-0001-NotesS1.pdf?v=1&s=3bc91d982957021a33919c3eb7143afd4c6312ed
Article
Previous studies have reported correlation of leaf hydraulic vulnerability with pressure–volume parameters related to cell turgor. This link has been explained on the basis of the effects of turgor on connectivity among cells and tissue structural integrity, which affect leaf water transport. In this study, we tested the hypothesis that osmotic adj...
Article
Full-text available
The hypothesis that aquaporins and carbonic anhydrase (CA) are involved in the regulation of stomatal (g s) and mesophyll (g m) conductance to CO2 was tested in a short-term water-stress and recovery experiment in 5-year-old olive plants (Olea europaea) growing outdoors. The evolution of leaf gas exchange, chlorophyll fluorescence, and plant water...
Article
Crown carbon gain is maximised for a given total water loss if stomatal conductance (gs) varies such that the marginal carbon product of water (∂A/∂E) remains invariant both over time and among leaves in a plant crown, provided the curvature of assimilation rate (A) vs transpiration rate (E) is negative. We tested this prediction across distinct cr...
Article
Full-text available
Physiol. Plant. ISI Document Delivery No.: AS0MY Times Cited: 3 Cited Reference Count: 45 Cited References: Alder NN, 1997, J EXP BOT, V48, P665, DOI 10.1093/jxb/48.3.665 Allen R., 1998, 56 FAO Barranco D, 1998, CULTURE OLIVE TREE Brodersen CR, 2013, PLANT PHYSIOL, V161, P1820, DOI 10.1104/pp.112.212712 Buckley TN, 2005, NEW PHYTOL, V168, P275, DO...
Article
Full-text available
Aims To evaluate the impact of the amount and distribution of soil water on xylem anatomy and xylem hydraulics on current-year shoots, plant water status and stomatal conductance of mature ‘Manzanilla’ olive trees. Methods Measurements of water potential, stomatal conductance, hydraulic conductivity, vulnerability to embolism, vessel diameter dist...
Article
Full-text available
Background & Aims There is not a consensus on the best irrigation approach for super-high density (SHD) olive orchards. Our aim was to design and test a regulated deficit irrigation (RDI) strategy for a sustainable balance between water saving, tree vigour and oil production. Methods We tested our RDI strategy for 3 years in an ‘Arbequina’ orchard...
Article
This article comments on: Temperature response of in vivo Rubisco kinetics and mesophyll conductance in Arabidopsis thaliana: comparisons to Nicotiana tabacum
Article
In woody plants photosynthetic capacity is closely linked to rates at which the plant hydraulic system can supply water to the leaf surface. Drought induced embolism can cause sharp declines in xylem hydraulic conductivity that coincide with stomatal closure and reduced photosynthesis. Recovery of photosynthetic capacity after drought is dependent...
Article
Full-text available
We used sap flow and trunk diameter measurements for assessing water stress in a high-density ‘Arbequina’ olive orchard with control trees irrigated to replace 100 % of the crop water needs, and 60RDI and 30RDI trees, in which irrigation replaced ca. 60 and 30 % of the control, respectively. We calculated the daily difference for both tree water co...
Article
Full-text available
A key objective for sustainable agriculture and forestry is to breed plants with both high carbon gain and water-use efficiency (WUE). At the level of leaf physiology, this implies increasing net photosynthesis (A N) relative to stomatal conductance (g s). Here, we review evidence for CO2 diffusional constraints on photosynthesis and WUE. Analyzing...
Article
Full-text available
Knowing the mechanisms and factors related with the control of the stomatal behaviour by plants is crucial for understanding the variation of transpiration with time or among plants under different conditions. The loss of hydraulic functioning in some parts of the plants has been reported to have an important influence in the plant stomatal closure...
Article
The interesting species-specific relationship between maximum daily shrinkage (MDS) and stem water potential (Ψstem) was investigated in order to understand the mechanisms involved. Vulnerability curves of Vitis, Citrus, Olea and Prunus were analysed and the air entry Ψstem in the xylem (Pe) was calculated. The water relations parameters of the liv...
Conference Paper
Full-text available
Knowledge of temporal variations in radial profiles of sap flux density (Js) and its relation to canopy water vapour exchange would help to improve our understanding of plant water relations. In this study we aimed to test if there is a consistent radial profile of Js in olive trees under optimal soil water availability and severe water stress cond...