A New High Quality and Early Maturing Rice Cultivar, “Wonchubyeo” Mutated from Chucheongbyeo

Abstract

“Wonchubyeo” is a new japonica rice (Oryza sativatute (KAERI) and was released in 2004. In order to select the mutants of Chucheongbyeo with god traits, the seds were ira-diated with 250 Gy gama ray (83.3 rad/min) emited from 60Co in a radiation facility at the KAERI in 192. Compared to the“Wonchubyeo” has slightly less tillers per hill, and a lower lodging degree and ripened grain ratio, but more spikelets per paniclethan those of Chucheongbyeo. It has considerably erect pubescent leaf blades and a tough culm with god canopy architecture. It ismoderately resistant to blast, but susceptible to major insect pests. “Wonchubyeo” has medium to smal grains with clear non-glu-anceof “Wonchubyeo” was about 5.56 MT/ha, which was higher than that of Chucheongbyeo with 5.49 MT/ha, in the local regional tri-als at 3 sites (Pocheon, Pyongtaek and Nonsan) during 2000~2001. It could be recomended for the northern and central plainareas of Korea.