sentence: Septiningsih et al. ( 2013 ) used 118 simple sequence repeat ( SSR ) molecular markers and an F population constructed from IR42 and Ma-Zhan Red to detect 6 QTLs related to seed germination and flooding tolerance under 10 cm flooding stress , and the BC F generation was used to verify the major effect locus qAG7.1 on chromosome 7 and estimate its contribution rate at 31.7 % .