일품벼 돌연변이 유래 고아밀로스 벼품종의 저항전분 특성

Content and Characteristics of Resistant Starch in High Amylose Mutant Rice Varieties Derived from Ilpum

This study was conducted to analyze the starch characteristics of three rice cultivars, Goami 2, Goami 3 and Goami 4 with high amylose content and resistant starch. These rice varieties were developed by mutation breeding based on N-methyl-N-nitrosourea (MNU) treatment in a japonica variety, Ilpum. Resistant starch contents of three high amylose mutant rice varieties and Ilpum were 11.87～13.69% and 0.36%, respectively. The X-ray diffraction patterns of starches of three varieties, Goami 2, Goami 3 and Goami 4 displayed B-type pattern. The proportion of amylopectin short chains of 6 to 12 in DP of the high amylose mutant rice varieties was significantly lower than that of Ilpum. Resistant starch contents had positive correlation with the amylose content, total dietary fiber content, medium length chains of 13 to 24, long chains of ≥ 25 in DP of amylopectin, pasting temperature and setback viscosity.