KOREAN JOURNAL OF CROP SCIENCE (한국작물학회지)

The Korean Society of Crop Science (한국작물학회)
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Effect of Oxygen and Temperature Levels on the Seedling Characteristics of Korean and Anaerobic Germination-tolerant Rice under Flooding Conditions

담수 직파에서 산소 및 온도조건에 따른 혐기발아 내성 자원과 국내 직파 적응성 벼 품종의 입모특성 비교

  • Jeong, Jong-Min (Crop Breeding Division, National Institute of Crop Science, Rural Development Administration) ;
  • Kim, Jinhee (Crop Breeding Division, National Institute of Crop Science, Rural Development Administration) ;
  • Mo, Youngjun (Crop Breeding Division, National Institute of Crop Science, Rural Development Administration) ;
  • Ha, Su-Kyung (Crop Breeding Division, National Institute of Crop Science, Rural Development Administration) ;
  • Kim, Woo-Jae (Crop Breeding Division, National Institute of Crop Science, Rural Development Administration) ;
  • Kim, Bo-Kyeong (Crop Breeding Division, National Institute of Crop Science, Rural Development Administration) ;
  • Jeung, Ji-Ung (Crop Breeding Division, National Institute of Crop Science, Rural Development Administration)
  • 정종민 (농촌진흥청 국립식량과학원 작물육종과) ;
  • 김진희 (농촌진흥청 국립식량과학원 작물육종과) ;
  • 모영준 (농촌진흥청 국립식량과학원 작물육종과) ;
  • 하수경 (농촌진흥청 국립식량과학원 작물육종과) ;
  • 김우재 (농촌진흥청 국립식량과학원 작물육종과) ;
  • 김보경 (농촌진흥청 국립식량과학원 작물육종과) ;
  • 정지웅 (농촌진흥청 국립식량과학원 작물육종과)
  • Received : 2019.10.03
  • Accepted : 2019.10.31
  • Published : 2019.12.31
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Abstract

The aim of the present study was to compare the germination and seedling characteristics of rice varieties grown under various flooding conditions and different temperature and oxygen levels and to identify germplasm suitable for wet direct seeding. Three anaerobic germination tolerant (AGT) genotypes (PBR, WD3, KHO) and eleven Korean rice varieties (KVs) adapted for direct seeding were evaluated for seedling performance under different temperatures (15, 18, 21, and 24℃ ) and oxygen levels (Low, Normal, High). Compared with the KVs, the AGT genotypes (especially KHO and PBR) exhibited relatively high germination and survival rates and coleoptile and radical growth rates under low temperature and low oxygen conditions, thereby indicating their suitability for wet direct seeding. Among the KVs, 'Dongan,' 'Jungan,' and 'Cheongdam' rice exhibited the highest survival rates under low temperature and low oxygen conditions. Three-way ANOVA indicated that temperature had the greater effects on seedling characteristics (43.2-78.0%) than either oxygen level (15.4-37.5%) or genotype (2.0-29.8%) did. Therefore, in direct seeding cultivation, temperature was the most important environmental factor for seedling establishment.

본 연구는 담수직파 초기 입모율 개선을 위해 혐기발아 내성이 우수한 자원들과 국내에서 육성된 직파적응성 품종 간 담수 중 입모관련 특성을 조사하고 담수 환경이 입모 관련 형질에 미치는 영향을 분석하였다. 저온에서 AGT 3자원들의 평균 저온발아율은 92.9%, 평균발아일수 9.1일로 KV품종들의 평균 저온 발아율 62.0%, 평균 발아속도 11.2일에 비해 저온조건에서도 발아율이 높았으며 발아 속도도 빠른 것으로 나타났다. 노지 담수 조건에서 AGT 품종들의 평균 생존율은 53%로 국내 직파 품종의 평균 생존율 22.7%보다 높았으며 온실 담수조건에서도 KV 품종에 비해 입모특성이 우수한 경향이었다. 특히 KHO, PBR, WD3는 저온발아율 및 혐기발아율 등 담수직파 관련형질이 우수하여 담수 직파 전용 벼품종개발을 위한 유용 유전자원으로 활용성이 클 것으로 판단되었다. 모든 공시품종들은 저온(15℃, 18℃)의 담수조건에서 대체적으로 혐기발아율 및 생존율이 낮았으며 초엽 및 유근의 생장도 불량하였으나 21℃ 이상의 조건에서는 생존율과 혐기발아 특성이 크게 개선되었다. 초기입모 관련 형질의 변이에는 온도>용존산소>품종 순으로 영향을 미치는 것으로 나타났으며 발아율 및 유근생장 변이에는 다른 형질에 비해 용존산소 농도의 영향이 다소 크게 작용하는 것으로 나타났다.

Keywords

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