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Dynamics of leaf water relations components in co-occurring iso- and anisohydric conifer species

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https://ir.library.oregonstate.edu/concern/articles/p5547t13b

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Abstract
  • Because iso- and anisohydric species differ in stomatal regulation of the rate and magnitude of fluctuations in shoot water potential, they may be expected to show differences in the plasticity of their shoot water relations components, but explicit comparisons of this nature have rarely been made. We subjected excised shoots of co-occurring anisohydric Juniperus monosperma and isohydric Pinus edulis to pressure-volume analysis with and without prior artificial rehydration. In J. monosperma, the shoot water potential at turgor loss (Ψ[subscript TLP]) ranged from −3.4 MPa in artificially rehydrated shoots to −6.6 MPa in shoots with an initial Ψ of −5.5 MPa, whereas in P. edulis mean Ψ[subscript TLP] remained at ∼−3.0 MPa over a range of initial Ψ from −0.1 to −2.3 MPa.The shoot osmotic potential at full turgor and the bulk modulus of elasticity also declined sharply with shoot Ψ in J. monosperma, but not in P. edulis. The contrasting behaviour of J. monosperma and P. edulis reflects differences in their capacity for homeostatic regulation of turgor that may be representative of aniso- and isohydric species in general, and may also be associated with the greater capacity of J. monosperma to withstand severe drought.
  • Keywords: osmotic potential, anisohydry, turgor, isohydry, drought
  • Keywords: osmotic potential, anisohydry, turgor, isohydry, drought
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  • Meinzer, F. C., Woodruff, D. R., Marias, D. E., McCulloh, K. A., & Sevanto, S. (2014). Dynamics of leaf water relations components in co‐occurring iso‐ and anisohydric conifer species. Plant, Cell & Environment, 37(11), 2577-2586. doi:10.1111/pce.12327
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  • 37
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  • 11
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  • This work was supported in part by interagency agreement DE-NA0001302 between Los Alamos National Laboratory and the USDA Forest Service Pacific Northwest Research Station and by NSF grant IBN 09–19871.
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file details MariasDanielleForestryDynamicsLeafWater.pdf 07/26/2017 Público
file details MariasDanielleForestryDynamicsLeafWater_FigureS1-S3.pdf 07/26/2017 Público