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Resistance to root growth and changes in the concentrations of ABA within the root and xylem sap during root-restriction stress

Resistance to root growth and changes in the concentrations of ABA within the root and xylem sap... Abstract The possibility that increased soil resistance to root growth may mediate the dwarfing response associated with root-restriction stress (RRS), via an abscisic acid (ABA) transduction mechanism, was investigated by characterizing the responses of tomato plants (Lycopersicon esculentum Mill cv. Red Dwarf) and changes within the soil environment at three rooting volumes (RV) (200, 400 and 800 cm3). Plant dry weight, leaf area and stomatal conductance decreased with RRS, although leaf water potential was unaffected by RRS. The concentration of ABA within the root system ([ABA]rt) and xylem sap ([ABA]xy) increased with RRS. Increased bulk density caused soil resistance to root growth to increase with increasing RRS. Changes in the soil environment, other than bulk density, which may have induced this variation in concentrations of ABA, were either eliminated or shown not to limit plant growth. The proportional relationships between RRS and soil resistance, [ABA]rt and [ABA]xy, and the inverse relationship between RRS and plant growth, are possibly indicative of the restricted root system experiencing increased resistance to root growth, with the subsequent initiation of a cascade of growth inhibiting responses. Soil resistance, root-restriction stress, dwarfing response, abscisic acid This content is only available as a PDF. © Oxford University Press 1999 © Oxford University Press 1999 http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Experimental Botany Oxford University Press

Resistance to root growth and changes in the concentrations of ABA within the root and xylem sap during root-restriction stress

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References (25)

Publisher
Oxford University Press
Copyright
Copyright © 2022 Society for Experimental Biology
ISSN
0022-0957
eISSN
1460-2431
DOI
10.1093/jxb/50.335.799
Publisher site
See Article on Publisher Site

Abstract

Abstract The possibility that increased soil resistance to root growth may mediate the dwarfing response associated with root-restriction stress (RRS), via an abscisic acid (ABA) transduction mechanism, was investigated by characterizing the responses of tomato plants (Lycopersicon esculentum Mill cv. Red Dwarf) and changes within the soil environment at three rooting volumes (RV) (200, 400 and 800 cm3). Plant dry weight, leaf area and stomatal conductance decreased with RRS, although leaf water potential was unaffected by RRS. The concentration of ABA within the root system ([ABA]rt) and xylem sap ([ABA]xy) increased with RRS. Increased bulk density caused soil resistance to root growth to increase with increasing RRS. Changes in the soil environment, other than bulk density, which may have induced this variation in concentrations of ABA, were either eliminated or shown not to limit plant growth. The proportional relationships between RRS and soil resistance, [ABA]rt and [ABA]xy, and the inverse relationship between RRS and plant growth, are possibly indicative of the restricted root system experiencing increased resistance to root growth, with the subsequent initiation of a cascade of growth inhibiting responses. Soil resistance, root-restriction stress, dwarfing response, abscisic acid This content is only available as a PDF. © Oxford University Press 1999 © Oxford University Press 1999

Journal

Journal of Experimental Botany – Oxford University Press

Published: Jun 1, 1999

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