Validation of an online system for the continuous monitoring of tree water status for sustainable irrigation managements in olive ( Olea europaea L.)

Marino, Giulia; Pernice, F.; Marra, Francesco Paolo; Caruso, Tiziano

doi:10.1016/j.agwat.2016.08.010

Cited by 30 publications

(33 citation statements)

References 26 publications

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“…Olive alternates high and low cropping seasons and this experiment considered only trees in an ON-year (heavy crop load). In this trial, the two Sicilian cultivars Nocellara del Belice (NB) and Olivo di Mandanici (MN) were selected for their different vigor and fruit characteristics (Marino et al, 2016(Marino et al, , 2017. Trees belonging to NB have low vigor, spreading canopy habit and yield large fruit, mainly processed as table olives, whereas MN trees show high vigor, upright canopy habit and yield smaller fruit, exclusively utilized for olive oil extraction.…”

Section: Experimental Designmentioning

confidence: 99%

“…Despite deficit irrigation, NB trees kept their stomata open in the afternoon (Figure 5), when ET 0 is highest, and might have not been able to limit water loss from transpiration, inducing low stem . Marino et al (2016) suggested that osmotic adjustments might be responsible of the relatively higher stem in a clone of MN. Furthermore, changes in the leaf cell elastic modulus occur in other olive genotypes under drought (Karamanos, 1984;Dichio et al, 2003;Bacelar et al, 2006).…”

Section: Plant Water Statusmentioning

confidence: 99%

“…In the last few years, emphasis has been given to the use of leaf patch clamp pressure (LPCP) probes for the continuous assessment of olive leaf water status (Fernández et al, 2011a;Ehrenberger et al, 2012;Rodriguez-Dominguez et al, 2012Marino et al, 2016;Padilla-Díaz et al, 2016;Fernándes et al, 2017). The output of LPCP probes is expressed as attenuated pressure of leaf patches (p p ), which is inversely related to cell turgor pressure (p c ) (Zimmermann et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

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A Cultivar-Sensitive Approach for the Continuous Monitoring of Olive (Olea europaea L.) Tree Water Status by Fruit and Leaf Sensing

et al. 2020

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Sustainable irrigation is crucial to reduce water use and management costs in modern orchard systems. Continuous plant-based sensing is an innovative approach for the continuous monitoring of plant water status. Olive (Olea europaea L.) genotypes can respond to drought using different leaf and fruit physiological and morphological mechanisms. This study aimed to identify whether fruit and leaf water dynamics of two different olive cultivars were differently affected by water deficit and their response to changes of midday stem water potential (stem), the most common indicator of plant water status. Plant water status indicators such as leaf stomatal conductance (g s) and stem were measured in the Sicilian olive cultivars Nocellara del Belice (NB) and Olivo di Mandanici (MN), in stage II and III of fruit development. Fruit gauges and leaf patch clamp pressure probes were mounted on trees and their raw data were converted in relative rates of fruit diameter change (RR fruit) and leaf pressure change (RR leaf), sensitive indicators of tissue water exchanges. The analysis of diel, diurnal and nocturnal fluctuations of RR fruit and RR leaf highlighted differences, often opposite, between the two cultivars under water deficit. A combination of statistical parameters extrapolated from RR fruit and RR leaf diurnal and nocturnal curves were successfully used to obtain significant multiple linear models for the estimation of midday stem. Fruit and leaf water exchanges suggest that olive cultivar can either privilege fruit or leaf water status, with MN likely preserving leaf water status and NB increasing fruit tissue elasticity under severe water deficit. The results highlight the advantages of the integration of fruit and leaf water dynamics to estimate plant water status and the need for genotype-specific models in olive.

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Section: Experimental Designmentioning

confidence: 99%

Section: Plant Water Statusmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A Cultivar-Sensitive Approach for the Continuous Monitoring of Olive (Olea europaea L.) Tree Water Status by Fruit and Leaf Sensing

et al. 2020

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“…SHD orchards offer many advantages: they reach productivity very few years after planting, allow mechanization of harvesting and partial mechanization of pruning (tree topping) and a significant reduction in production costs [1][2][3]. However, increased planting density increases light interception [4], root competition [5], and plant sensitivity to drought [6]. This suggests irrigation parameters may also need to change.…”

Section: Introductionmentioning

confidence: 99%

Gas Exchanges and Stem Water Potential Define Stress Thresholds for Efficient Irrigation Management in Olive (Olea europea L.)

Marino

Caruso

Ferguson

et al. 2018

Water

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With climate change and decreased water supplies, interest in irrigation scheduling based on plant water status is increasing. Stem water potential (Ψ SWP) thresholds for irrigation scheduling in olive have been proposed, however, a physiologically-based evaluation of their reliability is needed. A large dataset collected at variable environmental conditions, growing systems, and genotypes was used to characterize the relation between Ψ SWP and gas exchanges for olive. Based on the effect of drought stress on the ecophysiological parameters monitored, we described three levels of stress: no stress (Ψ SWP above about −2 MPa), where the high variability of stomatal conductance (g s) suggests a tight stomatal control of water loss that limit Ψ SWP drop, irrigation volumes applied to overcome this threshold had no effect on assimilation but reduced intrinsic water use efficiency (iWUE); moderate-stress (Ψ SWP between about −2.0 and −3.5 MPa), where iWUE can be increased without damage to the photosynthetic apparatus of leaves; and high-stress (Ψ SWP below about −3.5 MPa), where g s dropped below 150 mmol m −2 s −1 and the intercellular CO 2 concentration increased proportionally, suggesting non-stomatal limitation to photosynthesis was operative. This study confirmed that olive Ψ SWP should be maintained between −2 and −3.5 MPa for optimal irrigation efficiency and to avoid harmful water stress levels.

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“…Other effects of the environmental conditions and plant hydraulic functioning on the performance of the ZIM probe, were detailed by Zimmermann et al [163]. The ZIM system has been tested in a variety of forest tree species [165], grapevines [166,167], and grapefruit [167], banana [168], persimmon [169] and olive trees [49,[170][171][172], as well as in herbaceous crops such as tomato [173], canola [174] and wheat [175,176]. Also, comparative studies of the ZIM system vs. Scholander-type chambers have been made by Westhoff et al [166] for grapevines, by Rüger et al [165] for eucalyptus, avocado, grapefruit, beech and oak, and by Ben-Gal et al [170] and Fernández et al [49] for olive.…”

Section: Leaf Turgor Pressurementioning

confidence: 99%

Plant-Based Methods for Irrigation Scheduling of Woody Crops

Fernández

2017

Horticulturae

139

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Abstract:The increasing world population and expected climate scenarios impel the agricultural sector towards a more efficient use of water. The scientific community is responding to that challenge by developing a variety of methods and technologies to increase crop water productivity. Precision irrigation is intended to achieve that purpose, through the wise choice of the irrigation system, the irrigation strategy, the method to schedule irrigation, and the production target. In this review, the relevance of precision irrigation for a rational use of water in agriculture, and methods related to the use of plant-based measurements for both the assessment of plant water stress and irrigation scheduling, are considered. These include non-automated, conventional methods based on manual records of plant water status and gas exchange, and automated methods where the related variable is recorded continuously and automatically. Thus, the use of methodologies based on the Scholander chamber and portable gas analysers, as well as those of systems for measuring sap flow, stem diameter variation and leaf turgor pressure, are reviewed. Other methods less used but with a potential to improve irrigation are also considered. These include those based on measurements related to the stem and leaf water content, and to changes in electrical potential within the plant. The use of measurements related to canopy temperature, both for direct assessment of water stress and for defining zones with different irrigation requirements, is also addressed. Finally, the importance of choosing the production target wisely, and the need for economic analyses to obtain maximum benefit of the technology related to precision irrigation, are outlined.

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Validation of an online system for the continuous monitoring of tree water status for sustainable irrigation managements in olive ( Olea europaea L.)

Cited by 30 publications

References 26 publications

A Cultivar-Sensitive Approach for the Continuous Monitoring of Olive (Olea europaea L.) Tree Water Status by Fruit and Leaf Sensing

A Cultivar-Sensitive Approach for the Continuous Monitoring of Olive (Olea europaea L.) Tree Water Status by Fruit and Leaf Sensing

Gas Exchanges and Stem Water Potential Define Stress Thresholds for Efficient Irrigation Management in Olive (Olea europea L.)

Plant-Based Methods for Irrigation Scheduling of Woody Crops

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