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옥수수 한발 내성에 관한 유전적 다양성 조사

The Study of Genetic Diversity for Drought Tolerance in Maize

김재윤|김경희|이용호|신승호|이병무|송기태|문준철|김효철
한국환경생물학회 (Korean Society Of Environmental Biology)|2016.12|환경생물 (Korean Journal of Environmental Biology)|제34권 제4호|pp. 223-232

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참고문헌

키워드

genetic diversitydrought stressZea mays L.leaf rollinganthesis-silking interval (ASI)phylogenic tree

초록

본 연구에서는 21개 국내외 옥수수 수집종에 대한 유묘기와 성숙기의 대표적 환경 스트레스인 한발 스트레스에 대해반응하는 형태적, 유전적 근연관계를 분석하였다. 유묘기 잎말림은 5단계로 나누어 평가하였으며, ASI는 수염이 출사하기 시작한 날과 화분이 비산하기 시작한 날의 차이로 산정하였다. 유묘기 잎말림의 경우 4 이상의 수준을 보이면 회복이 불가하며 2, 3 정도의 수준은 정상적인 잎으로 회복이 가능하다. 따라서 유묘기 잎말림이 2 미만의 수준을 보인다면한발 내성 품종으로 평가할 수 있다. 또한, ASI는 한발 스트레스를 처리할 경우 3~7일 증가한다고 보고 되었으며 ASI 가 3일에서 11일로 증가할 경우 수확량이 71% 감소한다고보고 되어있다. 따라서 한발 스트레스를 처리했을때 ASI가5일 이하이고, 대조구에 비해 실험구의 ASI가 3일 이하로증가했다면 한발 내성 품종으로 평가할 수 있다. 한발조건에서의 유묘기 잎말림과 ASI 간의 상관분석 결과피어슨 상관계수값은 - 0.006으로 서로 연관이 없는 독립적인 특성인 것으로 나타났다. 21품종 중 한발 내성 품종 선발결과 CML228, Ki11 및 CML322가 높은 한발 내성을 지니고 있는 것으로 평가되었다. CML228과 CML322는 국내 품종과의 산포도가 높으나 Ki11은 매우 가까운 관계를 보여주고 있기 때문에 한발에 대한 내성 품종인 Ki11의 유전적 특징을 국내 품종에 활용하는 것이 가능할 것으로 사료된다.

Abstract

Drought is one of important environmental stress for plant. Drought has deleterious effect to plant growth including maize (Zea mays L.) such as vegetative and/or reproductive growth, root extension, photosynthesis efficiency, flowering, anthesis-silking interval (ASI), fertilization, and grain filling. In this study, we screened drought tolerant maize in 21 cultivars from different sources, sixteen NAM parent lines (B73, CML103, CML228, CML247, CML277, CML322, CML333, CML69, Ki11, Ki3, Ky21, M37W, Mo18w, NC350, Oh43 and Tx303), four Korean hybrids (Cheongdaok, Gangdaok, Kwangpyeongok and Pyeonganok) and one Southeast Asian genotype (DK9955). Drought stress (DS) index was evaluated with leaf rolling score at seedling stage and ASI at silking date. The leaf rolling scoring of CML228, DK9955 and Ki11 were determined 1.28, 1.85, 1.86, respectively. However, M37W, Kwangpyeongok, B73 and NC350 were determined over the 3. ASI analysis revealed that CML228, CML103, Cheongdaok, NC350, B73, CML322, Kwangpyeongok and Ki11 are represented less than 5 days under DS and less than 3 days of difference between DS and well-watered (WW), but CML69, Ki3, Pyeonganok, M37W, Mo18w and Gangdaok were represented more than 10 days under DS and more than 8 days of difference between DS and WW. Multi-Dimensional Scaling (MDS) analysis determined CML228, Ki11, and CML322 were regarded as drought tolerance cultivars. Eventually, Ki11 showed genetic similarity with Korean cultivars by QTL analysis and MDS analysis. Ki11 has a potential for development of drought tolerance maize with Korean cultivars.

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