A new technique for measuring oscillatory and diurnal changes in leaf thickness

Tyree, Melvin T.; Cameron, Stewart I.

doi:10.1139/x77-070

Cited by 10 publications

(11 citation statements)

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“…for estimating RWC or C leaf from leaf thickness and area for given leaves; Meidner, 1952;Jones, 1973;Tyree and Cameron, 1977). Our study further points to the importance of resistance to shrinkage as a trait contributing to drought tolerance (Supplemental Discussion S3).…”

Section: Applications Of Leaf Shrinkage For Drought Monitoring and Drsupporting

confidence: 58%

“…1;Meidner, 1952;Gardner and Ehlig, 1965;Downey and Miller, 1971;Syvertsen and Levy, 1982;Saini and Rathore, 1983;Burquez, 1987;McBurney, 1992;Sancho-Knapik et al, 2010. Leaves fluctuate in thickness daily and seasonally according to transpiration (Kadoya et al, 1975;Tyree and Cameron, 1977;Fensom and Donald, 1982;Rozema et al, 1987;Ogaya and Peñuelas, 2006;Seelig et al, 2012). Indeed, the relation of leaf thickness to water status is so tight that using leaf thickness to guide irrigation has led to water savings of up to 45% (Seelig et al, 2012).…”

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confidence: 99%

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Leaf Shrinkage with Dehydration: Coordination with Hydraulic Vulnerability and Drought Tolerance

et al. 2013

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Leaf shrinkage with dehydration has attracted attention for over 100 years, especially as it becomes visibly extreme during drought. However, little has been known of its correlation with physiology. Computer simulations of the leaf hydraulic system showed that a reduction of hydraulic conductance of the mesophyll pathways outside the xylem would cause a strong decline of leaf hydraulic conductance (K leaf ). For 14 diverse species, we tested the hypothesis that shrinkage during dehydration (i.e. in whole leaf, cell and airspace thickness, and leaf area) is associated with reduction in K leaf at declining leaf water potential (C leaf ). We tested hypotheses for the linkage of leaf shrinkage with structural and physiological water relations parameters, including modulus of elasticity, osmotic pressure at full turgor, turgor loss point (TLP), and cuticular conductance. Species originating from moist habitats showed substantial shrinkage during dehydration before reaching TLP, in contrast with species originating from dry habitats. Across species, the decline of K leaf with mild dehydration (i.e. the initial slope of the K leaf versus C leaf curve) correlated with the decline of leaf thickness (the slope of the leaf thickness versus C leaf curve), as expected based on predictions from computer simulations. Leaf thickness shrinkage before TLP correlated across species with lower modulus of elasticity and with less negative osmotic pressure at full turgor, as did leaf area shrinkage between full turgor and oven desiccation. These findings point to a role for leaf shrinkage in hydraulic decline during mild dehydration, with potential impacts on drought adaptation for cells and leaves, influencing plant ecological distributions.

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Section: Applications Of Leaf Shrinkage For Drought Monitoring and Drsupporting

confidence: 58%

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confidence: 99%

Leaf Shrinkage with Dehydration: Coordination with Hydraulic Vulnerability and Drought Tolerance

et al. 2013

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“…There is evidence of changes in leaf thickness in relation to soil and atmosphere water status, suggesting a potential for plant water stress assessment [151,152]. Leaf thickness-related measurements are made with devices containing linear potentiometer transducers (same principle as LVDT measurements).…”

Section: Leaf Thicknessmentioning

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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“…Chaney described a lever system for the measurement of leaf thickness similar to Bachmann's device with the ability to adjust the pressure that is being exerted to the leaf (Chaney 1970). In the electrical domain, the thickness of leaves has been measured using various transducer techniques (Heilman et al 1968;Tyree and Cameron 1977;Kadoya 1978;Smith 1979, 1981;Syvertsen and Levy 1982;Rozema et al 1987;Malone 1992;Sharon and Bravdo 1996;Vile et al 2005;Li et al 2009), mostly, however, by using linear variable displacement transducers (LVDTs), which utilize the principle of a diVerential transformer.…”

Section: Introductionmentioning

confidence: 99%

“…Various studies have recorded diurnal and nocturnal patterns of leaf thickness under diVerent stressful and non-stressful environmental conditions. Typically, leaf thickness is kept fairly constant during night times, but may decrease to some extent after sunrise, followed by a full recovery at about sunset or during night hours (Bachmann 1922;Meidner 1952;Tyree and Cameron 1977;Syvertsen and Levy 1982;Búr-quez 1987;Rozema et al 1987;McBurney 1992). Various parameters may change particularly the diurnal pattern, including soil temperature (Kadoya 1978), soil salinity (Rozema et al 1987), soil moisture content (Bachmann 1922;Tyree and Cameron 1977;Búrquez 1987), as well as the temperature and relative humidity of the ambient air.…”

Section: Introductionmentioning

confidence: 99%

Irrigation control of cowpea plants using the measurement of leaf thickness under greenhouse conditions

Seelig

Stoner²,

Linden

2011

Irrig Sci

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In this study, the thickness of cowpea leaves was measured with high data-and time-resolution, and the dynamics of leaf thickness was subsequently used as an input parameter for automated irrigation control at the greenhouse level. Under non-stressful environmental conditions, leaf thickness showed only minor diurnal and almost no nocturnal Xuctuations. In an extreme water deWcit stress scenario, leaf thickness decreased dramatically by as much as 45% within a short period of time. In a more realistic situation, leaf thickness was kept fairly constant for several days, but decreased substantially when water deWcit stress became too severe for the plants to cope with any longer. This characteristic collapse of leaf thickness was used as an input parameter for the automated initiation of irrigation. Upon automated irrigation, plants re-established their nominal leaf thickness quickly and kept this leaf thickness constant for several days, until signaling the need for the next irrigation by a subsequent decrease of leaf thickness. By using the measurement of leaf thickness for irrigation control, between 25 and 45% of irrigation water could be conserved compared with a typical timed irrigation schedule.

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A new technique for measuring oscillatory and diurnal changes in leaf thickness

Cited by 10 publications

References 0 publications

Leaf Shrinkage with Dehydration: Coordination with Hydraulic Vulnerability and Drought Tolerance

Leaf Shrinkage with Dehydration: Coordination with Hydraulic Vulnerability and Drought Tolerance

Plant-Based Methods for Irrigation Scheduling of Woody Crops

Irrigation control of cowpea plants using the measurement of leaf thickness under greenhouse conditions

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