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Paper Information

Journal:   JOURNAL OF CROP BIOTECHNOLOGY   FALL 2011 , Volume 1 , Number 1; Page(s) 49 To 59.
 
Paper: 

FINE-MAPPING OF A MAJOR EFFECT QTL RESPONSIBLE FOR SALINITY TOLERANCE (SALTOL) IN RICE

 
 
Author(s):  MOHAMMADI NEJAD GH.*, SINGH R.K., REZAIE M.A., ARZANI A., NAKHODA B., FOTOKIAN M.H., MOUMENI A., GREGORIO GLEN B.
 
* DEP. OF AGRONOMY AND PLANT BREEDING, COLLEGE OF AGRICULTURE, SHAHID BAHONAR UNIVERSITY OF KERMAN, KERMAN
 
Abstract: 

This research was conducted to validate and fine-map the region attributed to salinity tolerance (Saltol) on chromosome1 in rice at International Rice Research Institute (IRRI) during years 2005 to 2007. A major effect QTL (Saltol) which is responsible for Na+ and K+ uptake and Na/K ratio was identified using F8 recombinant inbred lines (RILs) of Pokkali/ IR29 cross on chromosome 1. This QTL explained around 64.3 to 80.2% of the phenotypic variation for the mentioned traits. Fine-mapping was done using 10 SSR and EST-SSR markers and near isogenic lines (BC3F4), derived from IR29 × Pokkali produced for salinity tolerance at seedling stage. Random BC3F4 individuals were genotyped and phenotyped under two different electrical conductivities at seedling stage. QTL responsible for salinity tolerance at both ECs, were found in the Saltol region, which explained 18 and 24% of the phenotypic variation for SES scores, respectively. According to the present results, possible location of Saltol was found in the interval around 1.2 cM on chromosome 1 that was around 350Kb based on physical map. This QTL was mapped at the intervals of RM8094, RM3412 and CP6224. Therefore, molecular breeding for salinity tolerance in Iranian genotypes could be done using the mentioned markers.

 
Keyword(s): FINE MAPPING, RICE, SALINITY TOLERANCE, SALTOL, SEEDLING STAGE
 
References: 
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