Plant Physiology Preview
Published on June 23, 2006; 10.1104/pp.106.082396
Received April 20, 2006
Returned for revision May 15, 2006
Accepted May 30, 2006
Natural variation for carbohydrate content in Arabidopsis thaliana : interaction with complex traits dissected by quantitative genetics
Fanny Calenge , Véra Saliba-Colombani , Stéphanie Mahieu , Olivier Loudet , Françoise Daniel-Vedele , and Anne Krapp *
INRA, Unité de Nutrition Azotée des Plantes, Centre de Versailles, 78026 Versailles, France
INRA, Station de Génétique et d'Amélioration des Plantes, Centre de Versailles, 78026 Versailles, France
* Corresponding author; email: krapp{at}versailles.inra.fr.
Besides being a metabolic fuel, carbohydrates play important roles in plant growth and development, in stress responses, and as signal molecules. We exploited natural variation in Arabidopsis to decipher the genetic architecture determining carbohydrates content. A quantitative trait locus (QTL) approach in the Bay-0 x Shahdara progeny grown in two contrasting nitrogen (N) environments led to the identification of 39 QTL for starch, glucose, fructose and sucrose contents representing at least 14 distinct polymorphic loci. A major QTL for fructose content (FR3.4) and a QTL for starch content (ST3.4) were confirmed in heterogeneous inbred families (HIFs). Several genes associated with C metabolism colocalise with the identified QTL. QTL for senescence related traits, and for flowering time, water status and N related traits, previously detected with the same genetic material, colocalise with C related QTL. These colocalisations reflect the complex interactions of C metabolism with other physiological processes. QTL fine-mapping and cloning could thus lead soon to the identification of genes potentially involved in the control of different connected physiological processes.
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