PLANT PHYSIOLOGY · 1992 · 77 citations · 15 references
Life SciencesPlant BiologyPlant SciencesPlant Hormone BiologyPlant Molecular BiologyPlant PhysiologyAbiotic Stress ToleranceAbscisic Acid BiologyDrought PhysiologyDrought Stress PhysiologyRoot PhysiologyStress BiochemistryAbscisic Acid Effects On GrowthPhysiological Drought ResponsePhysiological Responses To Water StressPlant Stress ResponsesRoot HairsRoot Responses To StressShoot Tip GrowthWater Response
Water stress has been shown to cause root hairs to become short and bulbous. Because abscisic acid (ABA) mediates a variety of water-stress responses, we investigated the response of Arabidopsis thaliana root hairs to ABA. When wild-type root hairs were treated with ABA, they exhibited the water-stress response. The Arabidopsis mutants abi1 and abi2, which are insensitive to ABA at the seedling stage, did not display the root hair response. These data suggest that ABA may mediate the response of root hairs to water stress. The drought response of root hairs resulting in an inhibition of tip growth will provide an easy screen to select mutations that are insensitive to ABA and/or involved in tip growth.
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