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JXB Advance Access published online on March 17, 2006
Journal of Experimental Botany, doi:10.1093/jxb/erj112
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© The Author [2006]. Published by Oxford University Press [on behalf of the Society for Experimental Biology]. All rights reserved. For Permissions, please e-mail: journals.permissions@oxfordjournals.org
Received August 9, 2005
Accepted January 9, 2006

RESEARCH PAPER

Quantitative trait loci analysis of leaf and plant longevity in Arabidopsis thaliana

Virginia M. C. Luquez 1, Yamila Sasal 2, Micaela Medrano 2, María I. Martín 2, Mercedes Mujica 3, and Juan J. Guiamét 2 *

1 Instituto de Fisiología Vegetal (INFIVE), Universidad Nacional de La Plata, CC 327, 1900 La Plata, Argentina; Present address: Umeå Plant Science Centre, SE-901 87 Umeå, Sweden
2 Instituto de Fisiología Vegetal (INFIVE), Universidad Nacional de La Plata, CC 327, 1900 La Plata, Argentina
3 Cátedra de Mejoramiento Genético, Facultad de Ciencias Agrarias y Forestales, Universidad Nacional de La Plata, CC 31, 1900 La Plata, Argentina

* To whom correspondence should be addressed.
Juan J. Guiamét, E-mail: jguiamet{at}fcnym.unlp.edu.ar


  Abstract

The natural variation in leaf and plant longevity in Arabidopsis thaliana was analysed in a set of 45 ecotypes and 155 recombinant inbred lines derived from a Cape Verde Islands (Cvi)xLandsberg erecta (Ler) cross. Post-bolting longevity was inversely related to time to flowering and rosette leaf number in the set of 45 ecotypes, with Cvi having the longest and Ler the shortest post-bolting longevity. The recombinant inbred line population was tested under low or high soil nutrient levels (LN or HN, respectively). Three quantitative trait loci (QTL), one in chromosome 3 and two in chromosomes 1 and 5, were associated with longevity of the 6th rosette leaf under LN and HN, respectively. Four QTL for post-bolting longevity were found in chromosomes 1, 3, 4, and 5, and two in chromosomes 1 and 5 under LN and HN, respectively. An epistatic interaction affecting post-bolting longevity under LN, but not HN, was detected. Ler and Cvi carry a mix of increasing and decreasing alleles for the QTL affecting longevity of the 6th leaf and post-bolting longevity. Longevity of the 6th rosette leaf was associated with different QTL than post-bolting longevity, and it was affected by different QTL depending on nutrient availability. By contrast, the major QTL affecting post-bolting longevity exerted significant effects irrespective of soil nutrient availability.

Keywords: Arabidopsis thaliana; leaf longevity; nutrient levels; quantitative trait loci.
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