| 호평벼와 남평벼의 혼합재배에 의한 도열병 방제와 레이스 다양성의 변화 |
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오인석, 민지영, 조명길, 노재환, 신동범, 송진, 김명기, 조영찬, 김병련, 한성숙 |
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| Rice Blast Control and Race Diversity by Mixed-Planting of Two Cultivars ("Hopyeongbyeo"/"Nampyeongbyeo") with Different Susceptibility to Magnaporthe oryzae |
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In Seok Oh, Ji Young Min, Myung Gil Cho, Jae Hwan Roh, Dong Bum Shin, Jin Song, Myeong Ki Kim, Young Chan Cho, Byung Ryun Kim, Seong Sook Han |
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| Abstract |
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Mixed-planting of two rice cultivars, HP (``Hopyeongbyeo``) and NP (``Nampyeongbyeo``), having a dissimilar susceptibility to rice blast was practiced for chemical-free control of rice blast in the field. The HP/NP combination was selected for applying under mechanized agricultural conditions. Because they have similar genetic characteristics such as seed germination and heading time, culm length, rice quality and size of rice grains except susceptibility to blast. Incidence of panicle blast was reduced 50.4% compare with supposed blast incidence by HP/NP mixed-planting when the seeds of two cultivars were combined 1 to 1 as weight. Supposed blast incidence was estimated from reduction of rice blast caused by addition of a resistant cultivar NP. Race diversity of Magnaporthe oryzae was examined for correlation with control effect of HP/NP mixed-planting on rice blast. The population of dominant race KJ-101 was diminished and replaced with various co-existing races and eleven new races were appeared in mixed-planting plot. Total number of race isolated from mixedplanting plot was not largely different from mono-culture. However, detection frequency of the new race was increased and variation of the population size of each race was decreased in mixed-planting plots. It was shown that a biased community with a dominant race (KJ-101 or KI-181) was altered to a balanced one of coexisting races. From these results, it was supposed that the balanced diversity among co-existing races within a community might be correlated to control effect by HP/NP mixed-planting on rice blast. Further more, it should be studied that genetic characteristics of the individual race including a virulence on cv. HP and NP was examined for verifying a correlation of mixed-planting effect and race diversity. |
| Key Words:
Mixed-planting, Race diversity, Rice blast |
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