Quantitative trait loci analysis of leaf and plant longevity in Arabidopsis thaliana.
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) x Landsberg 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.
Instituto de Fisiología Vegetal, Universidad Nacional de La Plata, CC 327, 1900 La Plata, Argentina.
Virginia M C
VM
Luquez
Yamila
Y
Sasal
Micaela
M
Medrano
María I
MI
Martín
Mercedes
M
Mujica
Juan J
JJ
Guiamét
D017360:Arabidopsis / Q000235:genetics* / Q000254:growth & development; D004777:Environment; D004843:Epistasis, Genetic; D035264:Flowers; D017343:Genes, Plant; D014644:Genetic Variation; D018515:Plant Leaves / Q000254:growth & development; D030821:Plants, Genetically Modified; D040641:Quantitative Trait Loci; D013997:Time Factors