Abstract
This study was carried out to identify the QTLs, associated with salinity tolerance at seedling stage, in indica rice using. F2:3 populations. QTL mapping was performed using microsatellite markers. Twelve linkage groups, covering a total size of 1648.9 cM, with an average interval distance 15.2 cM, were made. A total of 22 QTLs were identified, 9 and 13 for four morphological and six physiological traits, respectively. Correlations between salt injury score (SIS) and physiological traits reflected that damage of leaves was attributed to accumulation of Na+ in shoot by transport of Na+ from root to shoot in external high concentration. Microsatellite locus, RM 80 on chromosome 8, was found to be associated with SIS, Na+, K+ and Na:K in shoot. The correlated traits were found to be associated with the same locus or very close on the same chromosomal region. The QTLs detected for Na+, K+ and Na:K in the shoots and the roots did not share the same map locations, suggesting that the genes controlling the transport of Na+ and K+ between the shoots and the roots may be different.
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