Plant and Cell Physiology Advance Access published online on November 12, 2005
Plant and Cell Physiology, doi:10.1093/pcp/pci225
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1 Unité de Nutrition Azotée des Plantes, INRA, Route de Saint Cyr, 78 026 Versailles CEDEX
* To whom correspondence should be addressed. For the first time in Arabidopsis thaliana, this work propose the identification of QTL associated with leaf senescence and stress response symptoms such as yellowing and anthocyanin-associated redness. When Arabidopsis plants were cultivated under low nitrogen conditions, we observed that both yellowing of the old leaves of the rosette and whole rosette redness was promoted. Leaf yellowing is a senescence symptom related to chlorophyll breakdown. Redness is a symptom of anthocyanin-accumulation related to whole plant ageing and nutrient limitation. In this work, Arabidopsis is used as a model system to dissect the genetic variation of these parameters by quantitative trait loci (QTL) mapping in the 415 recombinant inbred lines of the Bay-0 x Shahdara population. Fifteen new QTL and two epistatic interactions were described in this study. The yellowing of the rosette, estimated by visual notation and image processing, was controlled by four and five QTL respectively. The visual estimation of redness allowed us to detect 6 QTL among which the major one explained 33% of the total variation. Two main QTL were confirmed in near-isogenic lines (HIF), thus confirming the relevance of the visual notation of these traits. Co-localisations between QTL for leaf-yellowing, redness and the QTL for nitrogen use efficiency described in a previous publication indicate complex interconnected pathways involved in both nitrogen management and senescence- and stress-related process. No co-localization between QTL for leaf-yellowing and redness has been found, suggesting that the two characters are genetically independent.
Received August 31, 2005
Accepted October 27, 2005
Regular Paper
Leaf Yellowing and Anthocyanin Accumulation Are Two Genetically Independent Strategies in Response to Nitrogen Limitation in Arabidopsis thaliana
Céline Diaz 1,
Vera Saliba-Colombani 1,
Olivier Loudet 2,
Pierre Belluomo 3,
Laurence Moreau 4,
Françoise Daniel-Vedele 1,
Jean-François Morot-Gaudry 1,
and
Céline Masclaux-Daubresse 1 *
2 Unité de Génétique et Amélioration des Plantes, INRA, Route de Saint Cyr, 78 026 Versailles CEDEX
3 Unité mixte de recherche Environnement des Grandes Cultures, INRA, 78850 Thiverval-Grignon
4 Unité Mixte de Recherche de Génétique Végétale, Ferme du Moulon, 91190 Gif-sur-Yvette
Céline Masclaux-Daubresse, E-mail: masclaux{at}versailles.inra.fr
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