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Local root abscisic acid (ABA) accumulation depends on the spatial distribution of soil moisture in potato: implications for ABA signalling under heterogeneous soil drying

Puértolas, Jaime, Conesa, Maria R., Ballester, Carlos and Dodd, Ian C. 2015, Local root abscisic acid (ABA) accumulation depends on the spatial distribution of soil moisture in potato: implications for ABA signalling under heterogeneous soil drying, Journal of experimental botany, vol. 66, no. 8, pp. 2325-2334, doi: 10.1093/jxb/eru501.

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Title Local root abscisic acid (ABA) accumulation depends on the spatial distribution of soil moisture in potato: implications for ABA signalling under heterogeneous soil drying
Author(s) Puértolas, Jaime
Conesa, Maria R.
Ballester, CarlosORCID iD for Ballester, Carlos orcid.org/0000-0002-6885-0883
Dodd, Ian C.
Journal name Journal of experimental botany
Volume number 66
Issue number 8
Start page 2325
End page 2334
Total pages 10
Publisher Oxford University Press
Place of publication Oxford, Eng.
Publication date 2015-04
ISSN 0022-0957
1460-2431
Keyword(s) Partial root-zone drying
root ABA
root water potential
root water uptake
root-to-shoot signalling
stomatal conductance
water-saving irrigation.
Abscisic Acid
Analysis of Variance
Desiccation
Humidity
Plant Leaves
Plant Roots
Signal Transduction
Soil
Solanum tuberosum
Summary Patterns of root abscisic acid (ABA) accumulation ([ABA]root), root water potential (Ψroot), and root water uptake (RWU), and their impact on xylem sap ABA concentration ([X-ABA]) were measured under vertical partial root-zone drying (VPRD, upper compartment dry, lower compartment wet) and horizontal partial root-zone drying (HPRD, two lateral compartments: one dry, the other wet) of potato (Solanum tuberosum L.). When water was withheld from the dry compartment for 0-10 d, RWU and Ψroot were similarly lower in the dry compartment when soil volumetric water content dropped below 0.22cm(3) cm(-3) for both spatial distributions of soil moisture. However, [ABA]root increased in response to decreasing Ψroot in the dry compartment only for HPRD, resulting in much higher ABA accumulation than in VPRD. The position of the sampled roots (~4cm closer to the surface in the dry compartment of VPRD than in HPRD) might account for this difference, since older (upper) roots may accumulate less ABA in response to decreased Ψroot than younger (deeper) roots. This would explain differences in root ABA accumulation patterns under vertical and horizontal soil moisture gradients reported in the literature. In our experiment, these differences in root ABA accumulation did not influence [X-ABA], since the RWU fraction (and thus ABA export to shoots) from the dry compartment dramatically decreased simultaneously with any increase in [ABA]root. Thus, HPRD might better trigger a long-distance ABA signal than VPRD under conditions allowing simultaneous high [ABA]root and relatively high RWU fraction.
Language eng
DOI 10.1093/jxb/eru501
Field of Research 060799 Plant Biology not elsewhere classified
0607 Plant Biology
0703 Crop And Pasture Production
Socio Economic Objective 970106 Expanding Knowledge in the Biological Sciences
HERDC Research category C1.1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2014, The Authors
Free to Read? Yes
Use Rights Creative Commons Attribution licence
Persistent URL http://hdl.handle.net/10536/DRO/DU:30088974

Document type: Journal Article
Collections: Faculty of Arts and Education
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Every reasonable effort has been made to ensure that permission has been obtained for items included in DRO. If you believe that your rights have been infringed by this repository, please contact drosupport@deakin.edu.au.