Korean Journal of Breeding Science (한국육종학회지)

The Korean Society of Breeding Science (한국육종학회)
권호 표지

Genetic Analysis on the Bacterial Blight Resistance of Suweon497, a Rice Breeding Line Developed through Wide Hybridization

벼 종간교잡 후대계통 '수원497호'의 흰잎마름병 저항성에 대한 유전분석

  • Received : 2011.03.18
  • Published : 2011.03.30
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Abstract

Rice wild relatives have been recognized as reservoirs of genetic reinforcements to improve cultivating rice against biotic and abiotic stresses. A wild relative, Oryza. minuta(BBCC; Acc. 101141), was hybridized with a Korean Japonica cultivar, 'Hwaseong'(AA), followed by ovule culture and several times of back crossings to overcome high level of sterility. During evaluation of the introgression lines, breeding line exhibited resistance to bacterial blight with reasonable agronomic performances, and nominated as an elite breeding line, the 'Suweon497'. A mapping population, to dissect genetic basis of the resistance, was constructed by using $F_2$ progenies of the 'Suweon497' ${\times}$ 'Milyang23'. Association analysis between SSR marker genotypes and pathogenisity levels of each $F_2$ progeny revealed the end terminal region of rice chromosome 11 as the nesting place for the wild rice derived bacterial blight resistance gene, where at least four other genes, Xa3, Xa4, Xa26 and Xa31, have been reported.

야생벼은 재배벼의 친환경적성을 강화시킬 수 있는 병해충 저항성 및 불량환경에 견딜 수 있는 유용한 유전자들의 보고로 알려져 왔다. 국내에서 육성된 벼 품종인 '화성'(AA게놈)와 야생벼인 Oryza. minuta(BBCC 게놈; Acc.=101141)간의 교잡을 통하여 종간잡종 후대들이 육성되었다. 불화합성과 초기분리세대의 극심한 불임을 극복하기 위해 배주배양으로 $F_1$ 개체를 확보하였으며, '화성'으로의 여교잡을 수 차례 실시하였다. 확립된 계통들에 대한 표현형 평가를 통하여 흰잎마름 병에 저항성을 발현하는 계통을 확인하고 '수원497호'라 명명하였다. '수원497호'와 '밀양23호'간의 교잡에서 작성된 $F_2$ 개체들을 유전자지도 작성 및 표현형조사에 활용하였다. 유전자지도 작성에 사용된 SSR 마커의 유전자형과 흰잎마름병균 접종에 따른 병반장길이간의 연관성분석을 수행하였다. '수원 497호'의 흰잎마름병저항성을 지배하는 주동유전자가 염색체 11번 말단에 표지 되었는데, 기존에 보고되어 온 흰잎마름병 저항성유전자들인 Xa3, Xa4, Xa26 및 Xa31 등이 표지 된 곳과 동일하였다.

Keywords

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