Blast Resistance of High Quality Rice Cultivars

摘要

Blast resistance of 18 rice cultivars which recommended as a high quality rice cultivars evaluated by blast nursery test seedling test, and field screening and sequential planting methods. Sangmibyeo, Hwayeongbyeo, and Dongjin 1 were showed high resistance reaction to leaf blast at the blast nursery continuously, while Chucheongbyeo showed highest disease severity All of the early maturing cultivars, Odaebyeo, Junghwabyeo, and Sangmibyeo, showed the lowest compatibility against 25 blasi isolates. Saechucheongbyeo, a multiline variety of Chucheongbyeo genetic background showed 45.8%, half compatibility of 82.6/o m Chucheongbyeo against 25 isolates screened. Diseased leaf areas (DLA, %) of cultivars were very low level at all test sites in the fie d test. Three cultivars, Sangmibyeo, Ilmibyeo, and Junghwabyeo didn't show any leaf blastiesions across the test sites. The most variable incidences of panicle blast were observed on Odaebyeo which was 42.4%, 0.4%. and 0.0% at Jaecheon Naju, and Chuncheon respectively. In the sequential planting method, four rice cultivars, Nampyeongbyeo, Sindongjinbyeo' Hwayeongbyeo, and Junambyeo showed less than 40% disease leaf area (DLA) from 1st planting to 7th planting so those' cultivars were considered as a durable resistant rice cultivar against rice blast diseases.