Abstract : "Oraebyeo" is mutation of a high quality japonica cultivar, Ilpumbyeo new japonica rice cultivar developed from by N-methyl-N-nitrosourea(MNU) treatment on fertilized egg cell by the rice breeding team of Gangwon Provincial Agricultural Res. & Ext. Service in 2006. This variety heads 20 days earlier than Ilpumbyeo and similar to that of Odeabyeo an early maturing leading cultivar of northern plain ares of Korea. Compared with Odaebyeo has a good semi-erect plant type with lodging tolerance due to much shortened plant thight(12cm shorter than Odaebyeo). Oraebyeo has similar panicle number with Odaebye where as it has more spikelets per panicle. However, this variety less the ratio of ripened grains and 1,000 grain weight than those of Odaebyeo. The yield performance of this cultivar in milled rice was about 5.09MT/ha in local adaptability test conducted for three years 2002-2004 and 5.51MT/ha in the demonstration plot of farmers field.

Key words : Oraebyeo, Rice, Mutation, Japonice, Leaf blast