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JXB Advance Access originally published online on March 17, 2006
Journal of Experimental Botany 2006 57(6):1363-1372; 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

RESEARCH PAPER

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

Virginia M. C. Luquez1 *, Yamila Sasal1, Micaela Medrano1, María I. Martín1, Mercedes Mujica2 and Juan J. Guiamét1,{dagger}

1Instituto de Fisiología Vegetal (INFIVE), Universidad Nacional de La Plata, CC 327, 1900 La Plata, Argentina
2Cátedra de Mejoramiento Genético, Facultad de Ciencias Agrarias y Forestales, Universidad Nacional de La Plata, CC 31, 1900 La Plata, Argentina

{dagger} To whom correspondence should be addressed. E-mail: jguiamet{at}fcnym.unlp.edu.ar

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.

Key words: Arabidopsis thaliana, leaf longevity, nutrient levels, quantitative trait loci


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