Excessive water stress can cause severe damage to sorghum and results in significant yield reduction. The aim of this study is to identify quantitative trait loci (QTL) for excessive water stress in sorghum. As a first step, two out of 21 bmr mutants were selected for their superior agronomic performance and Chlorophyll a fluorescence OJIP transient, and were crossed with an elite Korean cultivar, Hwangkeumchal, to construct mapping populations. One hundred ten out of 236 SSR primers showed polymorphism between two parens, which cover ten chromosomes of sorghum from different published SSR linkage maps of sorghum. Development of recombinant inbred lines from the crosses ‘25M2-0698 x Hwangkeumchal’ and ‘25M2-0404 x Hwangkeumchal’ are in progress using the single seed descendent method for generation acceleration.

• JY Park(Institute of Ecological Phytochemistry, School of Plant and Envrionmental Science, Hankyong National Univ.)
• AR Kim(Institute of Ecological Phytochemistry, School of Plant and Envrionmental Science, Hankyong National Univ.)
• SY Yoo(Institute of Ecological Phytochemistry, School of Plant and Envrionmental Science, Hankyong National Univ.)
• JI Kim(Rural Development Administration, National Institute of Crop Science, Dept. of Functional Crop)
• TW Jung(Rural Development Administration, National Institute of Crop Science, Dept. of Functional Crop)
• SH Woo(Dept. of Crop Science, Chungbuk National Univ.)
• HY Heo(Dept. of Plant Sciences and Plant Pathology, Montana State Univ., USA)
• TW Kim(Institute of Ecological Phytochemistry, School of Plant and Envrionmental Science, Hankyong National Univ.)
• TS Ko(Institute of Ecological Phytochemistry, School of Plant and Envrionmental Science, Hankyong National Univ.) Corresponding Author