전자코를 이용하여 한국에서 주로 재배되고 있는 자포니카 44품종의 쌀과 밥의 향 패턴을 분석하여 얻은 결과는 다음과 같다. 1. 백미 44품종의 향은 주성분분석과 군집분석결과 만금, 남평 ,신동진쌀이 한 그룹으로, 대진, 추청쌀이 또 다른 그룹 분류되어 나머지 39품종 쌀의 향과는 구분이 되는 것으로 나타났다. 2. 밥의 향은 분석결과 44품종들이 제1주성분 값 -8에서 +6사이에서 고른 분포를 보이며 품종간 구분은 되어지지 않았다. 3. 쌀과 밥의 향 측정에 사용된 12개의 MOS센서가 얻은 값을 상관관계 분석한 결과 쌀의 향과 밥의 향과는 서로 유의성이 없어 전자코를 이용하여 쌀시료로 취반 후 밥의 향을 예측하는 것은 어려운 것으로 나타났다.

Frequent occurrence of off-type plants in a given cultivar has been a serious problem in both breeder's and farmer's fields. An experiment was designed to examine the differences in rate of occurrence of off-type plants among Tongil-type cultivars (high yielding cultivars derived from indica/japonica hybridization) from which the possible cause of higher occurrence of off-type plant in a specific cultivar was deduced. Among five Tongil-type cultivars examined for morphological variant in the field, only one cultivar, Dasanbyeo, had off-type plants. When analyzed with SSR markers, off-type plants showed different band patterns from original cultivar, having several extra bands in addition to cultivar-specific band, suggesting that off-type plants were originated from Dasanbyeo, rather than originated from mixing or mishandling of seed materials with other cultivars. The possible cause of off-type occurrence seems to be natural pollination with other cuItivars adjacent to the original cultivar during seed multiplication. This was supported from the observation that self-crossed progeny of the off type plants showed a wide range of variation of agronomic traits which could not be observed when there was a smaller introduction of genes to the fixed germplasm as happened in the case of cultivar mutation. Another evidence supported this idea that Dasanbyeo showed much of difference in floral organ and behavior to other cultivar to be subjected to higher out-crossing than other cultivars examined.

Forty-four F₁ hybrids derived from crosses among eleven temperate japonica rice cultivars were grown and evaluated for traits related to cold tolerance including days to heading and spikelet fertility in the cold-water irrigated plot (17℃) and

Improving grain yield and quality of japonica rice continues to be a major breeding objective in Korea. In this study we evaluated genetic divergence among four japonica rice cultivars and assessed the relationship between genetic distance and hybrid perf

The elite rice cultivar, Suweon365, shows high level of leaf blast resistance. The number and chromosomal locations of genes conferring the resistance were detected by linkage analysis using DNA markers in the RILs from the cross between Suweon365 and Chu