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Plant root system is very important for both plant reproductive and survival in environmental stress.Primary roots are formed in the embryo and emerge from the seed during germination.Their early growth and morphological pattern is crucial for the development of root architecture.To better understand root development and morphological regulation of monocots, we preformed the screening of EMS mutagenized population of rice cultivar 93-11 for mutants that exhibit morphological defects in primary root development.