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Published on April 20, 2007; 10.1104/pp.107.096966

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Received January 30, 2007
Accepted April 13, 2007

Developmental Genes Have Pleiotropic Effects on Plant Morphology and Source Capacity, Eventually Impacting on Seed Protein Content and Productivity in Pea

Judith Burstin *, Pascal Marget , Myriam Huart , Annie Moessner , Brigitte Mangin , Christiane Duchene , Bruno Desprez , Nathalie Munier-Jolain , and Gérard Duc

INRA, UR102 Genetics and Ecophysiology of Grain Legumes, 21110 Bretenières, France; Bioplante GIE, 59930 La Chapelle d'Armentieres, France; Biogemma- Nickerson, Chartainvilliers, France INRA, BIA, BP52627, 31326 Castanet Tolosan cedex, France

* Corresponding author; email: burstin{at}epoisses.inra.fr.

Increasing pea seed nutritional value, and particularly seed protein content, while maintaining yield is an important challenge for further development of this crop. Seed protein content and yield are complex and unstable traits, integrating all the processes occurring during the plant life cycle. During filling, seeds are the main sink to which assimilates are preferentially allocated at the expense of vegetative organs. Nitrogen (N) seed demand is satisfied partly by nitrogen acquired by the roots but also by nitrogen remobilised from vegetative organs. In this study, we evaluated the respective roles of N source capacity and sink strength in the genetic variability of seed protein content and yield. We showed in 8 genotypes of diverse origins that both the maximum rate of N accumulation in the seeds and N source capacity varied among genotypes. Then, to identify the genetic factors responsible for seed protein content and yield variation, we searched for QTLs for seed traits and for indicators of sink strength and source nitrogen capacity. We detected 261 QTLs across 5 environments for all traits measured. Most QTLs for seed and plant traits mapped in clusters, raising the possibility of common underlying processes and candidate genes. In most environments, the genes Le and Afila, which control inter-node length and the switch between leaflets and tendrils respectively, determined plant N status. Depending on the environment, these genes were linked to QTLs of seed protein content and yield, suggesting source/sink adjustments depending on growing conditions.




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[Abstract] [Full Text] [PDF]


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