Plant and Cell Physiology Advance Access originally published online on November 12, 2005
Plant and Cell Physiology 2006 47(1):74-83; doi:10.1093/pcp/pci225
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Leaf Yellowing and Anthocyanin Accumulation are Two Genetically Independent Strategies in Response to Nitrogen Limitation in Arabidopsis thaliana
1 Unité de Nutrition Azotée des Plantes, INRA, Route de Saint Cyr, 78 026 Versailles Cedex, France
2 Unité de Génétique et Amélioration des Plantes, INRA, Route de Saint Cyr, 78 026 Versailles Cedex, France
3 Unité Mixte de Recherche Environnement des Grandes Cultures, INRA, 78850 Thiverval-Grignon, France
4 Unité Mixte de Recherche de Génétique Végétale, Ferme du Moulon, 91190 Gif-sur-Yvette, France
* Corresponding author: E-mail, masclaux{at}versailles.inra.fr; Fax, +33-1-30-83-30-96.
For the first time in Arabidopsis thaliana, this work proposes the identification of quantitative trait loci (QTLs) 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 were 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 QTL mapping in the 415 recombinant inbred lines of the Bay-0xShahdara population. Fifteen new QTLs 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 QTLs, respectively. The visual estimation of redness allowed us to detect six QTLs among which the major one explained 33% of the total variation. Two main QTLs were confirmed in near-isogenic lines (heterogenous inbred family; HIF), thus confirming the relevance of the visual notation of these traits. Co-localizations between QTLs for leaf yellowing, redness and nitrogen use efficiency described in a previous publication indicate complex interconnected pathways involved in both nitrogen management and senescence- and stress-related processes. No co-localization between QTLs for leaf yellowing and redness has been found, suggesting that the two characters are genetically independent.
(Received August 31, 2005; Accepted October 27, 2005)
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