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Targeted association analysis identified japonica rice varieties achieving Na+/K+ homeostasis without the allelic make-up of the salt tolerant indica variety Nona Bokra

Ahmadi N., Negrão S., Katsantonis D., Frouin J., Ploux J., Letourmy P., Droc G., Babo P., Trindade H., Bruschi G., Greco R., Oliveira M., Piffanelli P., Courtois B.. 2011. Theoretical and Applied Genetics, 123 (6) : p. 881-895.

During the last decade, a large number of QTLs and candidate genes for rice tolerance to salinity have been reported. Using 124 SNP and 52 SSR markers, we targeted 14 QTLs and 65 candidate genes for association mapping within the European Rice Core collection (ERCC) comprising 180 japonica accessions. SigniWcant diVerences in phenotypic response to salinity were observed. Nineteen distinct loci signiWcantly associated with one or more phenotypic response traits were detected. Linkage disequilibrium between these loci was extremely low, indicating a random distribution of favourable alleles in the ERCC. Analysis of the function of these loci indicated that all major tolerance mechanisms were present in the ERCC although the useful level of expression of the diVerent mechanisms was scattered among diVerent accessions. Under moderate salinity stress some accessions achieved the same level of control of Na+ concentration and Na+/K+ equilibrium as the indica reference variety for salinity tolerance Nona Bokra, although without sharing the same alleles at several loci associated with Na+ concentration. This suggests (a) diVerences between indica and japonica subspecies in the eVect of QTLs and genes involved in salinity tolerance and (b) further potential for the improvement of tolerance to salinity above the tolerance level of Nona Bokra, provided the underlying mechanisms are complementary at the whole plant level. No accession carried all favourable alleles, or showed the best phenotypic responses for all traits measured. At least nine accessions were needed to assemble the favourable alleles and all the best phenotypic responses. An eVective strategy for the accumulation of the favourable alleles would be marker-assisted population improvement. (Résumé d'auteur)

Mots-clés : tolérance au sel; oryza sativa; europe; grèce; france; oryza sativa japonica

Thématique : Génétique et amélioration des plantes; Troubles divers des plantes

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