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- Title
QTL analysis for sugar-regulated leaf senescence supports flowering-dependent and -independent senescence pathways.
- Authors
Wingler, Astrid; Purdy, Sarah Jane; Edwards, Sally-Anne; Chardon, Fabien; Masclaux-Daubresse, Céline
- Abstract
•The aim of this work was to determine the genetic basis of sugar-regulated senescence and to explore the relationship with other traits, including flowering and nitrogen-use efficiency. •Quantitative trait loci (QTLs) for senescence were mapped in the Arabidopsis Bay-0 × Shahdara recombinant-inbred line (RIL) population after growth on glucose-containing medium, which accelerates senescence. The extent of whole-rosette senescence was determined by imaging the maximum quantum yield of photosystem II ( Fv/ Fm). •A major QTL on the top of chromosome 4 colocalized with FRI, a major determinant of flowering. This QTL interacted epistatically with a QTL on chromosome 5, where the floral repressor FLC localizes. Vernalization accelerated senescence in late-flowering lines with functional FRI and FLC alleles. Comparison with previous results using the Bay-0 × Shahdara population showed that rapid rosette senescence on glucose-containing medium was correlated with early flowering and high sugar content in compost-grown plants. In addition, correlation was found between the expression of flowering and senescence-associated genes in Arabidopsis accessions. However, an additional QTL on chromosome 3 was not linked to flowering, but to nitrogen-use efficiency. •The results show that whole-rosette senescence is genetically linked to the vernalization-dependent control of flowering, but is also controlled by flowering-independent pathways.
- Subjects
AGING in plants; QUANTITATIVE research; FLOWERING of plants; PLANT phenology; PLANT physiology; ARABIDOPSIS; PLANT chromosomes; PLANT cells &; tissues; PLANT growth
- Publication
New Phytologist, 2010, Vol 185, Issue 2, p420
- ISSN
0028-646X
- Publication type
Article
- DOI
10.1111/j.1469-8137.2009.03072.x