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- Title
QTL meta-analysis in Arabidopsis reveals an interaction between leaf senescence and resource allocation to seeds.
- Authors
Chardon, Fabien; Jasinski, Sophie; Durandet, Monique; Lécureuil, Alain; Soulay, Fabienne; Bedu, Magali; Guerche, Philippe; Masclaux-Daubresse, Céline
- Abstract
Mapping of metaQTL controlling leaf senescence and seed resource allocation in Arabidopsis reveals that leaf senescence might disrupt the general negative correlation observed between yield and seed nitrogen concentration.Sequential and monocarpic senescence are observed at vegetative and reproductive stages, respectively. Both facilitate nitrogen (N) remobilization and control the duration of carbon (C) fixation. Genetic and environmental factors control N and C resource allocation to seeds. Studies of natural variation in Arabidopsis thaliana revealed differences between accessions for leaf senescence phenotypes, seed N and C contents, and N remobilization efficiency-related traits. Here, a quantitative genetics approach was used to gain a better understanding of seed filling regulation in relation to leaf senescence and resource allocation. For that purpose, three Arabidopsis recombinant inbred line populations (Ct-1×Col-0, Cvi-0×Col-0, Bur-0×Col-0) were used to map QTL (quantitative trait loci) for ten traits related to senescence, resource allocation, and seed filling. The use of common markers across the three different maps allowed direct comparisons of the positions of the detected QTL in a single consensus map. QTL meta-analysis was then used to identify interesting regions (metaQTL) where QTL for several traits co-localized. MetaQTL were compared with positions of candidate genes known to be involved in senescence processes and flowering time. Finally, investigation of the correlation between yield and seed N concentration in the three populations suggests that leaf senescence disrupts the negative correlation generally observed between these two traits.
- Subjects
ARABIDOPSIS; LEAF aging; AGING in plants; FLOWERING time; NITROGEN
- Publication
Journal of Experimental Botany, 2014, Vol 65, Issue 14, p1
- ISSN
0022-0957
- Publication type
Article
- DOI
10.1093/jxb/eru125