Water relations and hydraulic architecture of two Patagonian steppe shrubs: Effect of slope orientation and microclimate
On a local scale, topography influences microclimate, vegetation structure and the morpho-physiological attributes of plants. We studied the effects of microclimatic differences between NE- and SW-facing slopes on the water relations and hydraulic properties of two dominant shrubs of the Patagonian...
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todo:paper_01401963_v75_n9_p763_Iogna2023-10-03T14:58:20Z Water relations and hydraulic architecture of two Patagonian steppe shrubs: Effect of slope orientation and microclimate Iogna, P.A. Bucci, S.J. Scholz, F.G. Goldstein, G. Colliguaja integerrima Irradiance Leaf water potential Retanilla patagonica Water transport efficiency Wind Wood density adaptation hydraulic conductivity irradiance leaf microclimate morphology osmosis physiological response plant water relations shrub slope soil water spatial analysis steppe topographic effect vegetation structure wind forcing Patagonia Colliguaja integerrima Retanilla patagonica On a local scale, topography influences microclimate, vegetation structure and the morpho-physiological attributes of plants. We studied the effects of microclimatic differences between NE- and SW-facing slopes on the water relations and hydraulic properties of two dominant shrubs of the Patagonian steppe in Argentina (Retanilla patagonica and Colliguaja integerrima). The NE-facing slope had higher irradiance and air saturation deficits and lower soil water availability and wind speed than the SW-facing slope. Predawn and midday ΨL and osmotic potentials were significantly lower in shrubs on the NE-facing slope. Osmotic adjustment and more elastic cell walls helped the plants to cope with a more xeric environment on NE-facing slope. Higher water deficits on NE-facing slope were partially compensated by a higher leaf and stem water storage. While stem hydraulic efficiency did not vary between slopes, leaf hydraulic conductance was between 40% and 300% higher on the NE-facing slope. Changes observed in leaf size and in SLA were consistent with responses to mechanical forces of wind (smaller and scleromorphic leaves on SW-facing slope). Morpho-physiological adjustments observed at a short spatial scale allow maintenance of midday ΨL above the turgor loss point and demonstrate that leaves are more responsive to microclimatic selective pressures than stems. © 2011. Fil:Bucci, S.J. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Scholz, F.G. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Goldstein, G. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_01401963_v75_n9_p763_Iogna |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Colliguaja integerrima Irradiance Leaf water potential Retanilla patagonica Water transport efficiency Wind Wood density adaptation hydraulic conductivity irradiance leaf microclimate morphology osmosis physiological response plant water relations shrub slope soil water spatial analysis steppe topographic effect vegetation structure wind forcing Patagonia Colliguaja integerrima Retanilla patagonica |
| spellingShingle |
Colliguaja integerrima Irradiance Leaf water potential Retanilla patagonica Water transport efficiency Wind Wood density adaptation hydraulic conductivity irradiance leaf microclimate morphology osmosis physiological response plant water relations shrub slope soil water spatial analysis steppe topographic effect vegetation structure wind forcing Patagonia Colliguaja integerrima Retanilla patagonica Iogna, P.A. Bucci, S.J. Scholz, F.G. Goldstein, G. Water relations and hydraulic architecture of two Patagonian steppe shrubs: Effect of slope orientation and microclimate |
| topic_facet |
Colliguaja integerrima Irradiance Leaf water potential Retanilla patagonica Water transport efficiency Wind Wood density adaptation hydraulic conductivity irradiance leaf microclimate morphology osmosis physiological response plant water relations shrub slope soil water spatial analysis steppe topographic effect vegetation structure wind forcing Patagonia Colliguaja integerrima Retanilla patagonica |
| description |
On a local scale, topography influences microclimate, vegetation structure and the morpho-physiological attributes of plants. We studied the effects of microclimatic differences between NE- and SW-facing slopes on the water relations and hydraulic properties of two dominant shrubs of the Patagonian steppe in Argentina (Retanilla patagonica and Colliguaja integerrima). The NE-facing slope had higher irradiance and air saturation deficits and lower soil water availability and wind speed than the SW-facing slope. Predawn and midday ΨL and osmotic potentials were significantly lower in shrubs on the NE-facing slope. Osmotic adjustment and more elastic cell walls helped the plants to cope with a more xeric environment on NE-facing slope. Higher water deficits on NE-facing slope were partially compensated by a higher leaf and stem water storage. While stem hydraulic efficiency did not vary between slopes, leaf hydraulic conductance was between 40% and 300% higher on the NE-facing slope. Changes observed in leaf size and in SLA were consistent with responses to mechanical forces of wind (smaller and scleromorphic leaves on SW-facing slope). Morpho-physiological adjustments observed at a short spatial scale allow maintenance of midday ΨL above the turgor loss point and demonstrate that leaves are more responsive to microclimatic selective pressures than stems. © 2011. |
| format |
JOUR |
| author |
Iogna, P.A. Bucci, S.J. Scholz, F.G. Goldstein, G. |
| author_facet |
Iogna, P.A. Bucci, S.J. Scholz, F.G. Goldstein, G. |
| author_sort |
Iogna, P.A. |
| title |
Water relations and hydraulic architecture of two Patagonian steppe shrubs: Effect of slope orientation and microclimate |
| title_short |
Water relations and hydraulic architecture of two Patagonian steppe shrubs: Effect of slope orientation and microclimate |
| title_full |
Water relations and hydraulic architecture of two Patagonian steppe shrubs: Effect of slope orientation and microclimate |
| title_fullStr |
Water relations and hydraulic architecture of two Patagonian steppe shrubs: Effect of slope orientation and microclimate |
| title_full_unstemmed |
Water relations and hydraulic architecture of two Patagonian steppe shrubs: Effect of slope orientation and microclimate |
| title_sort |
water relations and hydraulic architecture of two patagonian steppe shrubs: effect of slope orientation and microclimate |
| url |
http://hdl.handle.net/20.500.12110/paper_01401963_v75_n9_p763_Iogna |
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AT iognapa waterrelationsandhydraulicarchitectureoftwopatagoniansteppeshrubseffectofslopeorientationandmicroclimate AT buccisj waterrelationsandhydraulicarchitectureoftwopatagoniansteppeshrubseffectofslopeorientationandmicroclimate AT scholzfg waterrelationsandhydraulicarchitectureoftwopatagoniansteppeshrubseffectofslopeorientationandmicroclimate AT goldsteing waterrelationsandhydraulicarchitectureoftwopatagoniansteppeshrubseffectofslopeorientationandmicroclimate |
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