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Journal of Experimental Botany 2008 59(8):2109-2123; doi:10.1093/jxb/ern073
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© 2008 The Author(s).
This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/2.0/uk/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited. This paper is available online free of all access charges (see http://jxb.oxfordjournals.org/open_access.html for further details)

RESEARCH PAPER

Physiological and molecular adaptations to drought in Andean potato genotypes

Cecilia Vasquez-Robinet1, Shrinivasrao P. Mane1, Alexander V. Ulanov2, Jonathan I. Watkinson3, Verlyn K. Stromberg1, David De Koeyer4, Roland Schafleitner5, David B. Willmot6, Merideth Bonierbale5, Hans J. Bohnert2,7 and Ruth Grene1,*

1Department of Plant Pathology, Physiology, and Weed Science, Virginia Tech, Blacksburg, VA 24061, USA
2Department of Crop Sciences, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
3Department of Biology, Virginia Tech, Blacksburg, VA 24061, USA
4Agriculture and Agri-Food Canada, New Brunswick, Canada E3B 4Z7
5Germplasm Enhancement and Crop Improvement Division, CIP, Lima, Peru
6Agilent Technologies, Wilmington, DE 19808, USA
7Department of Plant Biology, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA

* To whom correspondence should be addressed. E-mail: grene{at}vt.edu

The drought stress tolerance of two Solanum tuberosum subsp. andigena landraces, one hybrid (adgxtbr) and Atlantic (S. tuberosum subsp. tuberosum) has been evaluated. Photosynthesis in the Andigena landraces during prolonged drought was maintained significantly longer than in the Tuberosum (Atlantic) line. Among the Andigena landraces, ‘Sullu’ (SUL) was more drought resistant than ‘Negra Ojosa’ (NOJ). Microarray analysis and metabolite data from leaf samples taken at the point of maximum stress suggested higher mitochondrial metabolic activity in SUL than in NOJ. A greater induction of chloroplast-localized antioxidant and chaperone genes in SUL compared with NOJ was evident. ABA-responsive TFs were more induced in NOJ compared with SUL, including WRKY1, mediating a response in SA signalling that may give rise to increased ROS. NOJ may be experiencing higher ROS levels than SUL. Metabolite profiles of NOJ were characterized by compounds indicative of stress, for example, proline, trehalose, and GABA, which accumulated to a higher degree than in SUL. The differences between the Andigena lines were not explained by protective roles of compatible solutes; hexoses and complex sugars were similar in both landraces. Instead, lower levels of ROS accumulation, greater mitochondrial activity and active chloroplast defences contributed to a lower stress load in SUL than in NOJ during drought.

Key words: Chaperones, drought, flavonoids, metabolites, oligonucleotide-based microarray, osmolytes, potato, ROS, subspecies Andigena

Received 29 September 2007; Revised 17 January 2008 Accepted 14 February 2008


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