This study was done to understand the G x E interaction of rice blast reaction for Japonica high quality rice varieties and to observe blast pattern for high quality varieties. Twenty one percent of the total sum of squares (SST) in blast reaction data of high quality Japonica varieties is attributed to genotype (G) by environment (E) interaction variation. This portion of blast response is higher than 8～12% of G x E effect in blast severity data obtained from various ecotypes of rice varieties. Blast response scores obtained from high quality Japonica varieties group were more severely affected by environment condition than mixed groups with Japonica and Indica varieties. Interaction Principal Component Analysis (IPCA) scores obtained from AMMI analysis for the leaf blast response implied variation of G x E interaction. Correlation analysis suggested that IPCA1 was associated with latitude, maximum mean temperature, precipitation and mean cloud amount. IPCA2 was associated with mean relative humidity, and IPCA3 was associated with precipitation and minimum relative humidity. Pattern analysis generated nine genotype clusters according to blast reaction over 11 regions. Collectively, the A, B, C, and D groups were susceptible to rice blast, where as the E, F, G, H, and I groups were relatively resistant to rice blast through multi-location blast nursery test. Relationship between the identified genes of high quality varieties and blast scores at each test site in the level of group could be analyzed based on the results from G x E Interaction analysis.

To ensure the durability of resistance to blast disease in high-quality japonica rice a long-term rice breeding project to develop a few blast-resistant multiline cultivars was carried out from 1987 to 1999. Seven resistance donors were selected based on

A sequential planting method was developed to identify durable blast resistance in Korean rice cultivars. Two types of rice cultivars were investigated by a sequential planting after inoculation of mixed 26 rice blast isolates. Daesanbyeo and Gihobyeo, sh

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

최근 비교적 재배면적이 넓은 일미벼, 대산벼, 동안벼와 이들의 모본들로 구성된 23품종의 유전적 다양성을 조사한 결과를 요약하면 다음과 같다. 1. 1999년에서 2001년에 잎도열병과 이삭도열병이 심하게 발병한 일미벼. 대산벼, 동안벼는 밀양95호를 모본으로 육성되었다. 2. 밀양95호를 모본으로 하는 품종들에 대해 SSR 마커를 이용하여 유전적 다양성을 조사한 결과 57개 유전자좌위에서 170개(평균 3.0개)의 alleles이 관찰되었으며 대립유전자수는 2개에서 7개까지 다양하였다. 특히, RM249, RM206, OSR20은 6개 이상의 대립유전자를 가져 근연의 자포니카 벼품종간의 유전적 다양성 평가에 유용하게 이용될 수 있을 것으로 판단된다. 3.증폭된 밴드의 유무를 바탕으로 품종간 유전적 거리를 산출하여 군집분석을 실시한 결과 크게 4개의 군으로 나뉘었으며 일미벼, 대산벼, 동안벼는 모본인 밀양95호와 유전적 배경이 매우 유사하였다. 4. 같은 계보상의 품종들에 대해 도열병 저항성 유전자 인근의 마커를 이용한 유전적 다양성 분석결과가 계보도와 일치하여 이들 품종들의 저항성 유전자형 또한 유사할 것으로 추청할 수 있었다. 5. 조사품종의 계보상의 allele 전이를 분석한 결과 11번 염색체의 RM254의 3번째 allele과 12번 염색체의 OSR32의 2번째 allele이 밀양95호로부터 계속 전이되었음을 알 수 있었으며 이들 alleles의 도열병 이병화와의 연관성 여부는 추후에 검토가 이루어져야할 것이다.

Ilpumbyeo, a japonica rice cultivar which is known to have premium eating-quality, and high yield potential, but susceptible to rice blast disease was studied whether it has any specific rice blast resistance gene/QTL. Using CAPS markers which were develo

“Saechucheongbyeo” is a new japonica multiline for blast resistance, which was composed of equal proportions in seed weight of three near-isogenic lines of two combinations. The recurrent parent, “Chucheongbyeo”, was a high-quality rice cultivar with susc

Anseongbyeo is a japonicaseed weight of three near-isogenic lines of blast resistance. The recurrent parent, Suweon345, was a high-quality and semi-dwarf rice cultivar with susceptability to neck blast. The blast-resistance donors for each liens were SR12

Diversity and relatedness of 64 rice accessions were evaluated using 85 simple sequence repeats (SSRs) markers. These64 accessions represent a set of international and Korean blast diferential cultivars, a set of blast monogenic lines, donors of blastresi