Correlation analysis and QTL mapping of osmotic potential in japonica rice under upland and lowland conditions

Abstract

Mu, P. and Li, Z. 2013. Correlation analysis and QTL mapping of osmotic potential in japonica rice under upland and lowland conditions. Can. J. Plant Sci. 93: 785-792. In order to reveal the genetic basis of differences in osmotic potential (OP) of japonica rice under various water regimes, a recombinant inbreed line (RIL) population including 120 plants derived from a cross between an upland japonica rice IRAT109 and a paddy japonica rice Yuefu was used in this study. A complete genetic linkage map with 201 simple sequence repeat (SSR) molecular markers was constructed. Osmotic potentials of the RIL population and their parents were measured pre-dawn and at mid-day under lowland (no soil water stress) and upland (soil water stress) conditions. Significant correlations between osmotic difference (ODl) and (ODu) and index of drought resistance (IDR, based on relative yield in upland and lowland treatments) was found under lowland and upland conditions. Quantitative trait loci (QTL) associated with osmotic ...