Functional Plant Biology Functional Plant Biology Society
Plant function and evolutionary biology
RESEARCH ARTICLE

Two potato (Solanum tuberosum) varieties differ in drought tolerance due to differences in root growth at depth

Jaime Puértolas A D , Carlos Ballester B , E. David Elphinstone C and Ian C. Dodd A

A Lancaster Environment Centre, Lancaster University, Lancaster, LA1 1YQ, UK.

B Centro para el Desarrollo de la Agricultura Sostenible, Instituto Valenciano de Investigaciones Agrarias, Apdo. 46113, Moncada, Valencia, 46113, Spain.

C Myerscough College, Bilsborrow, Preston, PR3 0RY, UK.

D Corresponding author. Email: j.puertolas@lancaster.ac.uk

Functional Plant Biology 41(11) 1107-1118 http://dx.doi.org/10.1071/FP14105
Submitted: 2 April 2014  Accepted: 5 June 2014   Published: 6 August 2014

Abstract

To test the hypothesis that root growth at depth is a key trait explaining some genotypic differences in drought tolerance in potato (Solanum tuberosum L.), two varieties (Horizon and Maris Piper) differing in drought tolerance were subjected to different irrigation regimes in pots in a glasshouse and in the field under a polytunnel. In the glasshouse, both cultivars showed similar gas exchange, leaf water potential, leaf xylem ABA concentration and shoot biomass independently of whether plants were grown under well watered or water deficit conditions. Under well watered conditions, root growth was three-fold higher in Horizon compared with Maris Piper, 3 weeks after emergence. Water deficit reduced this difference. In the polytunnel, applying 60% or less irrigation volume compared with full irrigation significantly decreased tuber yield in Maris Piper but not in Horizon. This was coincident with the higher root density of Horizon in deep soil layers (>40 cm), where water content was stable. The results suggest that early vigorous root proliferation may be a useful selection trait for maintaining yield of potato under restricted irrigation or rainfall, because it rapidly secures access to water stored in deep soil layers. Although selecting for vigorous root growth may assist phenotyping screening for drought tolerance, these varieties may require particular environmental or cultural conditions to express root vigour, such as sufficiently deep soils or sufficient water shortly after emergence.

Additional keywords: abscisic acid, deficit irrigation, genotypic selection, partial rootzone drying, variety.


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