Journal of Bio-Environment Control (생물환경조절학회지)

The Korean Society for Bio-Environment Control (한국생물환경조절학회)
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Relationships among Viviporous Germination, Dry-heat Tolerance and Seed Longevity in Milyang 23/Gihobyeo RILs

벼 밀양 23호$\times$기호벼의 재조합 자식계통에서 수발아성,건열 저항성 및 종자수명간 상관관계

  • Lee, Seung-Yeob (Division of Plant Resources Science, Wonkwang University) ;
  • Ahn, Jeong-Ho (Division of Plant Resources Science, Wonkwang University) ;
  • Kim, Hyo-Jin (Division of Plant Resources Science, Wonkwang University) ;
  • Bae, Jong-Hyang (Division of Plant Resources Science, Wonkwang University) ;
  • Eun, Moo-Young (Rice Functional Genomics Team, National Institute of Agricultural Biotechnology)
  • 이승엽 (원광대학교 식물자원과학부) ;
  • 안정호 (원광대학교 식물자원과학부) ;
  • 김효진 (원광대학교 식물자원과학부) ;
  • 배종향 (원광대학교 식물자원과학부) ;
  • 은무영 (농업생명공학연구소)
  • Published : 2006.12.30
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Abstract

To investigate the relationships among the traits related seed dormancy in rice, viviparous germination, dry-heat tolerance and seed longevity were tested using 164 M/G RILs ($F_{17}$) derived from the cross between Milyang 23 (Indica/Japonica) and Gihobyeo (Japonica). At 40 days after heading, the viviparous germination rates of Milyang 23 and Gihobyeo were 0.0 and 7.0%, respectively. The averaged viviparous germination rate of 164 MIG RILs was 3.2%, and their range was from 0.0 to 50.9%. In dry-heat treatment at $90^{\circ}C$ for 24 h followed by the pre-drying at $40^{\circ}C$ for 2 days, Milyang 23 showed higher germinability (98.6%,2.7 days to $T_{50}$) than Gihobyeo (37.6%, 12.9 days to $T_{50}$), and the mean germination rate of 164 M/G RILs was 72.4%. In 54 months after harvest, the germinability in Milyang 23 and Gihobyeo were 90% and 0%, and 71 lines among 164 M/G RILs showed the germinability over 90%. The relationship between seed longevity and dry-heat tolerance was linearly correlated with high positive correlation coefficient. The relationships between seed longevity and viviparous germination, and viviparous germination and dry-heat tolerance were linearly correlated with high negative correlation coefficient. Milyang 23 had higher tolerance against high dry-heat, viviparous germination and long-term storage than Gihobyeo, and 164 M/G RILs showed the medium values of parents.

밀양 23호/기호벼 유래 164 RILs($F_{17}$)을 이용하여, 종자의 휴면과 관련이 있는 수발아 저항성, 건열 저항성 및 종자수명을 검정하고, 이들 상호간 상관관계를 조사하였다. 출수 40일째에 밀양23호와 기호벼의 수발아율은 0%, 7%이었고, M/G RILs은 0$\sim$50.9%의 범위를 보였으며, 평균 3.2%였다. $90^{\circ}C$, 24시간 건열처리후 밀양23호와 기호벼는 99.2%, 37.6%의 발아율을 보였고, $T_{50}$은 2.7일, 12.9일로 유의한 차이를 보였으며, M/G RILs의 평균 발아율은 72.4%였다. 상온저장 한 종자수명은 밀양23호는 수확후 3.5년까지도 80% 이상의 종자 발아율을 유지하였으나, 기호벼는 18개월 후부터 급격히 발아력이 감소하여(30%이하), 42개월 후 발아력을 완전히 상실하였다. M/G RILs의 종자활력은 수확후 42개월까지 71계통이 90%이상의 발아율을 보였다. 수발아 저항성, 건열 저항성 및 종자수명은 밀양 23호와 기호벼 간에 뚜렷한 품종간 차이를 보였으며, M/G RILs은 양친의 중간값에 가까운 평균값을 보였다. 건열저항성과 종자수명 간에는 고도로 유의한 정의 상관관계를 보였고, 수발아와 종자수명, 수발아와 건열저항성 간에는 부의 상관관계가 성립하였다.

Keywords

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