Journal
JOURNAL OF EXPERIMENTAL BOTANY
Volume 51, Issue 350, Pages 1543-1553Publisher
OXFORD UNIV PRESS
DOI: 10.1093/jexbot/51.350.1543
Keywords
drought; expansin; peroxidase; water deficits; wall loosening; xyloglucan endotransglycosylase
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It is common for the root/shoot ratio of plants to increase when water availability is limiting. This ratio increases because roots are less sensitive than shoots to growth inhibition by low water potentials. The physiological and molecular mechanisms that assist root growth under drought conditions are reviewed, with a focus on changes in cell walls. Maize seedlings adapt to low water potential by making the walls in the apical part of the root more extensible. In part, this is accomplished by increases in expansin activity and in part by other, more complex changes in the wall. The role of xyloglucan endotransglycosylase, peroxidase and other wall enzymes in root adaptation to low water potential is evaluated and some of the complications in the field of study are listed.
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