소득작물 전후작용 단기성 벼 품종 금오3호

A New Short Growth-Duration Rice Cultivar, Keumo 3

금오3호 는 소득작물 전 후작에 적응하는 벼를 육성하고자, 1997년 국립식량과학원 기능성작물부에서 내도복성인 농안벼에 내만식성인 신금오벼가 여교배된 F_1 개체에 도열병에 저항성이고 단기성인 YR15727-B-B-B-102 계통을 교배하여 YR19124 조합을 작성 하였다. 이후 집단 및 계통육종법으로 YR19124-B-B-B-69-3 계통을 선발하고 밀양201호라는 계통명으로 지역적응성검정 시험에 공시한 결과, 그 주요특성과 수량성은 다음과 같다

A new rice cultivar Keumo 3 was developed for adopting under double cropping system with after or before cash crop cultivation. It was selected from the cross-combination between YR17202 F_2/Shinkeumobyeo//YR15727-B-B-B-102. The parent, YR17202 F_2 individual plant, was used for tolerance to lodging, it derived from a cross between Nonganbyeo/Shinkeumobyeo. Nonganbyeo is well known to lodging tolerance cultivar, as well as biotic stress, because it was developed by crossing with Tongil type. And the YR15727-B-B-B-102 line used as another parent with short growth duration, likewise highly resistance to rice blast disease. The pedigree derived from the cross-combination YR17202 F_2/Shinkeumobyeo//YR15727-B-B-B-102 were generated to F_7, and a best line among them named as Milyang 201. After a series of yield trials, including local adaptability test conducted throughout the peninsular of Korea, Milyang 201 was registered with the name of Keumo 3 in 2005. The cultivar belongs to a early maturing group and heads 4 days earlier than Keumobyeo, a standard cultivar. It has short culm, and less spikelet number per panicle than Keumobyeo. However, its milled rice yield grown under extremely late transplanting time, 10. July, over the 3 local sites for 2003-2005 years, averaged 4,48 MT/ha, which is 6% higher than the standard, Keumobyeo. Keumo 3 has showed a durable resistance to leaf blast disease during fourteen blast nurseries screening covered from south to north in Korea for 2003-2007 years. And it was confirmed harbours pi-zt, a durable blast resistance gene. Moreover it was incompatible with 19 blast isolates under artificial inoculation, except one isolate, K1101. Additionally, Keumo 3 exhibits resistance to K_1, K_2 and K_3 of bacterial blight pathogen, as well as strip virus disease resistance, and moderate resistance to dwarf virus disease. Consequently, the new rice cultivar Keumo 3 would be well adopted where a bio stress makes a big problem annually.