Root foraging in response to heterogeneous soil moisture in two grapevines that differ in potential growth rate |
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| Authors: | Bauerle Taryn L Smart David R Bauerle William L Stockert Christine Eissenstat David M |
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| Affiliation: | Department of Horticulture, Penn State University, University Park, PA, USA;;Department of Viticulture and Enology, University of California, Davis, Davis, CA, USA;;Department of Horticulture &Landscape Architecture, Colorado State University, Fort Collins, CO, USA |
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| Abstract: | * Linkages between plant growth rate and root responses to soil moisture heterogeneity were investigated. * Root dynamics were studied using genetically identical shoots (Vitis vinifera cv. Merlot) with genetically distinct root systems that promote higher (HSV) and lower (LSV) shoot growth rates (1103P and 101-14 Mgt, respectively). Three quantities of irrigation replenished different amounts of evapotranspiration (0, 40 and 100%ET(c)) in a California vineyard. * Roots of HSV vines exhibited more plasticity, as indicated by greater preferential growth in irrigated soil during the summer, and a larger shift in root diameter with a change in soil moisture than LSV vines. Higher tolerance of low soil moisture was not observed in LSV roots--root survivorship was similar for the two rootstocks. LSV vines produced a large fraction of its roots during the winter months and increased root density over the study, while HSV vines produced roots mainly in summer and only exhibited a high initial peak in root biomass in the first year. * These results demonstrated that a plant of higher vigor has greater morphological plasticity in response to lateral heterogeneity in soil moisture but similar tolerance to moisture stress as indicated by root survivorship in dry soil. |
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| Keywords: | avoidance localized water stress minirhizotron plasticity root production and survivorship shoot vigor tolerance Vitis rootstock |
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