A New Non Dietary Starch and High Amylose Rice Cultivar, “Goamy 2”

“Goamy 2” is a new japonica rice cultivar developed from Ilpumbyeo mutation lines of N-methyl-N-nitrosourea (MNU) treatment on fertilized egg cell by the rice genetics and breeding team of National Crop Experiment Station, R.D.A., in 2002. This cultivar has about 139 days of growth duration from transplanting to harvest in central plain area of Korea. It has a good semi-erect plant type and is resistant to lodging with short culm. The number of panicle/hill of “Goamy 2” is similar to that of Hwaseongbyeo and the number of spikelets per panicle is more than that of the check cultivar. However, this cultivar has less ratio of ripened grains and 1,000-grain weight than those of Hwaseongbyeo. The grains of “Goamy 2” have high amylose content(28.1%) and very low milling recovery (polished/rough) compared with Hwaseongbyeo, and translucent. This cultivar has non dietary starches such as D-Xylose and Arabinose. Starch shape and size of “Goamy 2” is smaller than those of Ilpumbyeo. This rice cultivar has slow leaf senescence and moderate tolerance to viviparous germination during the ripening stage. “Goamy 2” is susceptible to leaf blast, bacterial blight, virus diseases and insect pest. The yield performance of this cultivar in milled rice is about 4.24 MT/ha by the ordinary cultivation in local adaptability test for three years (2000~2002). “Goamy 2” is adaptable to the central and southern plain areas of Korea.