Abstract
Salinity tolerance in rice is critical at reproductive stage because it ultimately determines grain yield. An F2 mapping population derived from a Sadri/FL478 cross was exposed to saline field conditions (6–8 dS m − 1) after the active tillering stage to identify reproductive stage specific QTLs for salinity tolerance. Genetic linkage map was constructed using 123 microsatellite markers on 232 F2 progenies. Totally 35 QTLs for 11 traits under salinity stress were detected with LOD > 3, out of which 28 QTLs that explained from 5.9 to 30.0% phenotypic variation were found to be significant based on permutation test. Three major QTL clusters were found on chromosomes 2 (RM423–RM174), 4 (RM551–RM518) and 6 (RM20224–RM528) for multiple traits under salinity stress. Both parental lines contributed additively for QTLs identified for the yield components. A majority of the QTLs detected in our study are reported for the first time for reproductive stage salinity stress. Fine-mapping of selected putative QTLs will be the next step to facilitate marker-assisted backcrossing and to detect useful genes for salinity tolerance at the reproductive stage in rice.
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Acknowledgements
The authors thank A. G. Sajise and N. A. Vispo for technical assistance in the salinity screening, and M. Arceta for technical assistance in the genotyping. We also appreciate Dr Endang M. Septiningsih and Dr Bert C. Y. Collard for their useful suggestions and comments. Technical editing by Dr Bill Hardy is sincerely acknowledged. The help of the head of the Plant Breeding, Genetics and Biotechnology Division is duly acknowledged for permission to conduct the research at IRRI.
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[Mohammadi R., Mendioro M. S., Diaz G. Q., Gregorio G. B. and Singh R. K. 2013 Mapping quantitative trait loci associated with yield and yield components under reproductive stage salinity stress in rice (Oryza sativa L.). J. Genet. 92, xx–xx]
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MOHAMMADI, R., MENDIORO, M.S., DIAZ, G.Q. et al. Mapping quantitative trait loci associated with yield and yield components under reproductive stage salinity stress in rice (Oryza sativa L.) . J Genet 92, 433–443 (2013). https://doi.org/10.1007/s12041-013-0285-4
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DOI: https://doi.org/10.1007/s12041-013-0285-4