Oscillations in stomatal conductance of hybrid poplar leaves in the light and dark

Reich, Peter B.

doi:10.1111/j.1399-3054.1984.tb05167.x

Cited by 14 publications

(18 citation statements)

References 23 publications

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“…Guard cells can respond within seconds (93,95,98,114); their movement depends on cell water potential and turgor pressure, which in turn depends on where precisely the bulk of water evaporates in the leaf, and on the hydraulic conductances from the veins to epidermis and guard cells (e.g., 26, 45). Quantifying these parameters should help explain the onset of patchy behavior of stomata at small scales (76).…”

Section: Water Movement Outside the Xylem: Bundle Sheath And Mesophyllmentioning

confidence: 99%

Leaf Hydraulics

Sack

Holbrook

2006

Annu. Rev. Plant Biol.

842

881

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Leaves are extraordinarily variable in form, longevity, venation architecture, and capacity for photosynthetic gas exchange. Much of this diversity is linked with water transport capacity. The pathways through the leaf constitute a substantial (>or=30%) part of the resistance to water flow through plants, and thus influence rates of transpiration and photosynthesis. Leaf hydraulic conductance (K(leaf)) varies more than 65-fold across species, reflecting differences in the anatomy of the petiole and the venation architecture, as well as pathways beyond the xylem through living tissues to sites of evaporation. K(leaf) is highly dynamic over a range of time scales, showing circadian and developmental trajectories, and responds rapidly, often reversibly, to changes in temperature, irradiance, and water supply. This review addresses how leaf structure and physiology influence K(leaf), and the mechanisms by which K(leaf) contributes to dynamic functional responses at the level of both individual leaves and the whole plant.

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Section: Water Movement Outside the Xylem: Bundle Sheath And Mesophyllmentioning

confidence: 99%

Leaf Hydraulics

Sack

Holbrook

2006

Annu. Rev. Plant Biol.

842

881

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“…Potential modifications at the receptor sites, or an ineffectiveness of both stimuli in inducing the necessary rise in cytosolic Ca^"^ may be invoked as alternative explanations. Finally, darkness is known to induce only partial stomatal closure in well watered plants of poplar species (Reich, 1984;Ceulemans et al, 1988;Furukawa et al, 1990). This w-as apparent in 'Robusta', and even more in 'Peace'.…”

mentioning

confidence: 99%

Responses to water stress in an ABA ‐ unresponsive hybrid poplar (Populus koreana×trichocarpa cv. Peace) I. Stomatal function

et al. 1996

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SUMMARY The poplar cultivar ‘Peace’ (Populus trichocarpa×koreana) displays abnormal stomatal behaviour with a lack of sensitivity to exogenous abscisic acid (ABA) in mature leaves. We report details of the leaf‐age dependency of this feature, and present the responses of stomata to diverse closing stimuli in addition to ABA. Soil water depletion induced complete stomatal closure of the youngest leaves, whereas the oldest exhibited almost no closure. By contrast, no such age effect was observed in stomatal sensitivity to ABA: a complete lack of closure was observed on all leaves, even with 10‐3 M ABA. Moreover, a preconditioning by drought did not restore the ability of stomata to close in response to ABA. Supplying detached leaves with Ca2+ (5 × 10‐2 M) was effective in inducing stomatal closure in the youngest leaves, and reproduced the age‐dependent drought response. These results support the hypothesis that drought control of stomatal conductance in ‘Peace’ is ABA‐independent, and could involve calcium ions. A loss of stomatal sensitivity to calcium, with leaf maturation, could explain the dependency of stomatal closure on leafage. Xylem sap concentrations of calcium were lower than those required to close stomata, and no drought‐induced increase was recorded. The mature leaves were also insensitive to increased ambient CO2, but darkness promoted partial stomatal closure.

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“…Stomatal density was measured for leaves which developed at different times during the growing season, and conductance was measured for leaves under several different conditions. Other aspects of stomatal behaviour in hybrid poplar have been presented elsewhere (Reich 1984a, b Visual examination of leaf surfaces was by pbotomicrography. Leaf portions were fixed in 2 % glutaraldebyde-1 % formaldhyde in 50 mM sodium cacodylate buffer (pH 7-6), postfixed in 2%OsO4, and embedded in Spurr's resin.…”

Section: Introductionmentioning

confidence: 99%

Leaf Stomatal Density and Diffusive Conductance in Three Amphistomatous Hybrid Poplar Cultivars

REICH

1984

New Phytologist

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SUMMARYStomatal density and diffusive conductance were characterized for both leaf surfaces in three amphistomatous hybrid cultivars of poplar. Consistent differences in stomatal density were observed between cultivars and between leaf surfaces within a cultivar. Mean stomatal density in the three cultivars ranged from 150 to 330 stomata mm~^ for abaxial leaf surfaces and from 75 to 100 stomata mm~^ for adaxial surfaces. The density of stomata on the abaxial versus adaxial surface was related to the spatial orientation of leaves with respect to the horizon and this stomatal ratio ranged from 1-4 to 4-0 in the three clones. Also, stomatal density was greater in leaves at higher rather than lower nodal positions.Differences in diffusive conductance between cultivars and leaf surfaces were observed on intact and detached leaves in the light and dark. Within each cultivar mean abaxial conductance (^ab) ^^^ greater than adaxial conductance (^ad)-Mean conductances in the light for the three cultivars ranged from 0-22 to 0-62 cm s"^ for abaxial, and from 0"15 to 0-17 cm s'^ for adaxial surfaces, and in the dark they were between 0-06 and 0-26 cm s~^ for abaxial, and from 0-04 to 0-06 for adaxial surfaces. The differences in conductance between cultivars and between leaf surfaces were correlated with their respective stomatal densities. Stomatal response to light and to leaf excision also varied between cultivars and between the two leaf surfaces.

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Oscillations in stomatal conductance of hybrid poplar leaves in the light and dark

Cited by 14 publications

References 23 publications

Leaf Hydraulics

Leaf Hydraulics

Responses to water stress in an ABA ‐ unresponsive hybrid poplar (Populus koreana×trichocarpa cv. Peace) I. Stomatal function

Leaf Stomatal Density and Diffusive Conductance in Three Amphistomatous Hybrid Poplar Cultivars

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