A New Eariy Maturing Rice Cultivar 'Junamjosaeng' with Multiple Disease Resistance and High Grain Quality Traits

摘要

Junamjosaeng is a new japonica rice cultivar developed in 2006 from a cross between Milyang 165*3 and Koshihikari at the Department of Functional Crop Science, NICS, RDA. This cultivar is suitable for the double cropping system (i. e., before and after the cash crop). Heading date of Junamjosaeng is 6 days earlier than Keumobyeo under the late transplanting cultivation on July 10. It has a high grain fertility under cold conditions and low premature heading. One of the distinguishing characteristicsof this variety is its resistance to major diseases like leaf blast, bacterial blight races (K_1, K_2, K_3) and rice stripe virus disease. However, it showed susceptibility to major insect pests. Milled rice kernels are translucent with non glutinous endosperm and have 6.7% protein and 19.8% amylose contents. Milling recovery of head rice is 75.7%. The palatability of cooked rice is better than Keumobyeo. The milled rice yield of Junamjosaeng in local adaptability tests after harvest of the cash crop was 4.43 tons ha~(-1). This cultivar is suitable for planting in the plain paddy fields of Honam and Yeonnam regions in Korea.