KOREAN JOURNAL OF CROP SCIENCE (한국작물학회지)

The Korean Society of Crop Science (한국작물학회)
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Evaluation of Cold Tolerance-Related Traits of Recombinant Inbred Lines in Rice

벼 재조합 자식계통의 내냉성 관련 형질 분석

  • Published : 2005.06.01
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Abstract

This study was carried out to construct cold-tolerance characteristics. The RILs were developed from progenies of a cross between cold-susceptible Tongil-type rice variety, Milyang 23 and cold-tolerant Japonica rice variety, Stejaree 45 by single seed descent methods. The 175 RILs $(F_8)$ were evaluated for cold tolerance traits by field screening under cold-water irrigation. Frequency distribution of RILs in leaf discoloration, heading delay, culm length reduction and number of spikelets reduction displayed nearly normal distributions with transgressive segregations to either side of parents, while the spikelet fertility reduction and panicle exsertion at low-temperature showed the more or less skewed continuous distribution toward the susceptible parent. Higher heritabilities over $60\%$ were observed in leaf discoloration, spikelet fertility reduction, panicle exsertion, while relatively lower heritabilities less than $40\%$ were observed in culm length reduction, number of spikelets reduction and grain yield reduction. Some cold-tolerance RILs were selected effectively by cold water irrigation, which are expected to be good materials in breeding program for cold tolerance.

본 연구는 저온에 민감한 밀양 23호를 모본으로 내냉성이 강한 Stejaree45호를 부본으로 교잡하여 육성한 175 RILs를 이용하여 내냉성 관련 형질들의 변이분포, 유전 통계량 및 상관 관계를 분석하였다. 조사된 형질 중 수당영화수, 적고, 출수지연일수, 간장단축율 및 영화수감소율은 정규분포에 가까운 연속변이 분포곡선을 보였으며, 모든 형질에서 양친의 범위를 벗어나는 초월분리현상을 보였다. 임실감소율과 수량감소율은 모본인 밀양 23호 쪽으로 일정하게 치우친 경향으로 저온에 민감한 쪽으로, 출수지연일수와 간장단축율은 부본인 Stejaree45 쪽으로 치우친 경향으로 내냉성이 증가되는 쪽으로 작용가가 큰 유전자가 관여하는 것으로 추정되었다. 내냉성 관련 형질들의 상관관계 중 수량감소율과 상관이 인정되었던 형질은 출수지연일수, 간장단축율, 이삭추출도 및 임실감소율이었고, 조사된 형질중 유전력이 $60\%$이상으로 나타난 형질은 분얼기 적고, 임실감소율, 이삭추출도 였으며, 유전력이 $40\%$ 이하로 낮았던 형질은 간장단축율, 영화수감소율 및 수량감소율이었다. 175 RILs 중에서 내냉성 관련 형질의 내냉성 정도가 부본인 Stejaree45수준이거나 그 이상의 내냉성 형질을 가진 것은 86계통으로, 1개의 내냉성 형질은 56계통 $32.0\%$였고, 2개의 내냉성 형질은 25계통 $14.3\%$, 3개의 내냉성 형질은 4계통 $2.3\%$, 4개의 내냉성 형질은 1계통 밖에 없었으며, 그 이상의 내냉성 관련 형질을 가진 계통은 없었다.

Keywords

References

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