Detection of chromosomal regions controlling drought osmotic stress in rice

Germination vigour is one of the most important factors for plant stablishing under drought stress. In order to detect of quantitative trait loci related to drought tolerance in germination stage a genetic map was provided by 74 SSR marker and 192 individuals of 2:4 derived from cross between Tarom mahalli × Khazar population. The hundred seeds of 2 families were used for recording of germination rate, radical length and plumule length. Seventy four SSR markers grouped in 12 linkage groups. Thirteen QTLs were detected for traits. Three QTLs were mapped on chromosome 1 that increased drought tolerance in germination stage in rice. Out of these QTLs, qGR-1a distinguished as major effect and explained 26.27% of the total variation. Correlations between traits and overlapping QTLs in RM466-RM259 interval provided a good region for gene pyramiding and marker assisted programs.