ID:
publications-454
Type:
PEER REVIEWED ARTICLE
Year:
2013
Authors:
JAIME PUĂRTOLAS , ROSALĂA ALCOBENDAS , JUAN J. ALARCĂN , IAN C. DODD
Title:
Long-distance abscisic acid signalling under different vertical soil moisture gradients depends on bulk root water potential and average soil water content in the root zone
Venue/Journal:
DOI:
10.1111/pce.12076
Research type:
Predictive Analytics
Water System:
Groundwater
Technical Focus:
Abstract:
AbstractTo determine how rootâtoâshoot abscisic acid (ABA) signalling is regulated by vertical soil moisture gradients, root ABA concentration ([ABA]root), the fraction of root water uptake from, and root water potential of different parts of the root zone, along with bulk root water potential, were measured to test various predictive models of root xylem ABA concentration [RXâABA]sap. Beans (Phaseolus vulgarisâ
L. cv. Nassau) were grown in soil columns and received different irrigation treatments (top and basal watering, and withholding water for varying lengths of time) to induce different vertical soil moisture gradients. Root water uptake was measured at four positions within the column by continuously recording volumetric soil water content (θv). Average θv was inversely related to bulk root water potential (Ψroot). In turn, Ψroot was correlated with both average [ABA]root and [RXâABA]sap. Despite large gradients in θv, [ABA]root and root water potential was homogenous within the root zone. Consequently, unlike some splitâroot studies, root water uptake fraction from layers with different soil moisture did not influence xylem sap (ABA). This suggests two different patterns of ABA signalling, depending on how soil moisture heterogeneity is distributed within the root zone, which might have implications for implementing waterâsaving irrigation techniques.
Link with Projects:
245159
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