Developing Lowland Rice Germplasm with Resistance to Multiple Biotic Stresses through Anther Culture in Uganda

서지정보

ㆍ발행기관 : 한국국제농업개발학회 ㆍ수록지정보 : 한국국제농업개발학회지 / 27권 / 4호
ㆍ저자명 : Lamo Jimmy, Gyoung-rae Cho, Jane Ininda, Dartey Paul Kofi Ayirebi, Ekebu James, Ekobu Moses, Alibu Simon, Okanya Stephen, Oloka Bonny, Otim Michael, Asea Godfrey, Kyung-Ho Kang

한국어 초록

농진청에서 수행하고 있는 아프리카 국제협력프로그램인KAFACI 사업의 일환으로 우간다 등 8개국에 ‘통일형 다수성벼 품종개발’ 사업을 추진하고 있다. 이를 위해 아프리카에서정상적인 생육과 수량을 나타내는 다수성 통일형 품종인 밀양23호와 아프리카의 재래종인 O. glaberrima를 이용하여 밀양23호의 유전적배경을 보유한 근동질 계통인 BC4F1을 육성하고, 약배양을 통해 유전적 고정계통을 육성하였다. 이 중 50개계통을 우간다에서 생물검정을 실시한 결과, 아프리카에서 문제시되는 Yellow Mottle Virus (RYMV), Bacterial LeafStreak(BLS), 흰잎마름병 및 도열병에 복합저항성인 계통으로판명되었다. 특히 RYMV에 대한 저항성은 저항성원이 결여되어 있는 병으로 본 연구를 통해 육성한 계통들은 향후 아프리카에 적응하는 내병성 다수성 품종개발에 유용한 재료를 활용 될 것으로 생각된다.

영어 초록

The lowland rice genotypes grown in Uganda were introduced in the 1970s. These genotypes (now landraces) are threatened by multiple biotic stresses namely; Rice Yellow Mottle Virus (RYMV) disease, Bacterial Leaf Streak(BLS). Bacterial Leaf Blight (BLB), and Rice Blast (BL). There are currently no rice lines with multiple resistance to these stresses although attempts have been made to develop them through hybridization involving cultivated, local and introduced lines and four varieties with tolerance to RYMV have been released. The use of potential resistance donor such as the traditional African cultivated rice, Oryza glaberrima, could be an alternative approach to furnish multiple resistance to the cultivated rice. The rice germplasm developed from a cross of an Oryza glaberrima from Niger Delta and Milyang23, a high-yielding Korean rice variety were evaluated for multiple resistance in Uganda as a Korea-Africa Food & Agriculture Cooperation Initiative (KAFACI)-Alliance for a Green Revolution in Africa (AGRA) joint cooperative project, “Enhancement of High Yielding Rice Germplasm in African Countries through Anther Culture Breeding”. Milyang23 was back crossed 4 times with Oryza. glaberrima and fixed through anther culture in Korea. An evaluation of 50 lines generated showed that up to 98%, 92%, 88% and 88% of the test plants showed resistance to the RYMV, BLS, BLB and BL diseases, respectively. There was no symptoms of the four diseases in 74% of the genotypes tested. The plants that showed symptoms of the three diseases had scores of not more than 3 on a 1 to 9 scale. This preliminary finding demonstrates that these generations of rice lines could help solving the current problem of susceptibility to multiple diseases.

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