Horticultural Science & Technology (원예과학기술지)

Korean Society of Horticultural Science (한국원예학회)
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Morphological and Morphophysiological Dormancy in Seeds of Two Genera (Heloniopsis and Thalictrum) Native to Korea

자생 관상용 Heloniopsis와 Thalictrum속 종자의 형태적 및 형태생리적 휴면

  • Lee, Seung Youn (Department of Horticultural Science and Biotechnology, Seoul National University) ;
  • Rhie, Yong Ha (Department of Horticultural Science and Biotechnology, Seoul National University) ;
  • Jung, Hyun Hwan (Urban Agriculture Research Division, National Institute of Horticultural & Herbal Science, Rural Development Administration) ;
  • Kim, Ki Sun (Department of Horticultural Science and Biotechnology, Seoul National University)
  • 이승연 (서울대학교 원예생명공학전공) ;
  • 이용하 (서울대학교 원예생명공학전공) ;
  • 정현환 (농촌진흥청 국립원예특작과학원 도시농업연구팀) ;
  • 김기선 (서울대학교 원예생명공학전공)
  • Received : 2013.10.22
  • Accepted : 2014.02.05
  • Published : 2014.06.30
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Abstract

This study was conducted to find basic information for the research of morphological dormancy in seeds of two genera (Heloniopsis and Thalictrum) native to Korea. Seeds of Heloniopsis koreana, Heloniopsis tubiflora, Thalictrum rochenbrunianum, Thalictrum uchiyamai, and Thalictrum coreanum were collected, and embryo morphology and seed germination were investigated. All seeds of five species had underdeveloped embryos which occupied about 10-20% of the full seed length at maturity. The seeds of H. koreana and H. tubiflora had rudimentary embryos. The seeds of T. rochenbrunianum, T. uchiyamai, and T. coreanum had intermediate type between rudimentary and linear embryo. The small embryos of all seeds of five species grew to a critical length before radicles emerge from the seeds. At 30 days after sowing, the seeds of H. koreana and H. tubiflora germinated to 22.7% and 40.7%, respectively. On the other hand, the seeds of T. rochenbrunianum, T. uchiyamai, and T. coreanum germinated to 12.5%, 3.3%, and 0%, respectively. If embryo growth and germination in seeds are completed in approximately 30 days, the seed are said to have morphological dormancy (MD). However, if the seeds require > 30 days for germination, they are considered to have morphophysiological dormancy (MPD). Thus, the seeds of H. koreana and H. tubiflora had about 78% and 60% MPD, respectively. On the other hand, the seeds of T. rochenbrunianum, T. uchiyamai, amd T. coreanum had about 87%, 96%, and 100% MPD, respectively. There was a different level of dormancy (MD and MPD) within the same seed population examined. Therefore, germination of the seeds was delayed due to the underdeveloped embryos. This result could contribute to determine morphological seed dormancy and germination mechanism in seeds of the Korean Peninsula.

많은 백합과, 미나리아재비과 식물들의 종자들은 모식물체에서 미숙배를 가지고 탈리되는 것으로 보고되고 있다. 이러한 종자들은 형태적 또는 형태생리적 휴면을 가지고 있다. 따라서 본 연구는 몇 가지 자생 관상용 Helopniopsis, Thalictrum속 식물의 형태적 종자휴면 연구를 위한 기초자료를 제공하고자 수행하였다. 백합과의 처녀치마와 숙은처녀치마, 미나리아재비과의 금꿩의다리, 자주꿩의다리 및 연잎꿩의다리 종자의 배의 형태와 발아율을 조사하였다. 연구대상 다섯 종 모두 미숙배 종자였다. 백합과의 처녀치마와 숙은처녀치마는 미발달형 배를 가지고 있었다. 미나리아재비과의 꿩의다리 세 종은 모두 미발달형과 직선형의 중간형태로 판단되었다. 연구된 다섯 종 모두 유근이 돌출하기 전에 배가 일정 크기까지 신장하였다. 백합과의 처녀치마와 숙은처녀치마는 30일 동안 각각 22.7%, 40.7% 정도가 발아한 반면, 미나리아재비과의 금꿩의다리, 자주꿩의다리 및 연잎꿩의다리는 각각 12.5%, 3.3% 및 0%가 발아하였다. 따라서 처녀치마와 숙은처녀치마의 종자는 각각 약 78%, 60%정도가 형태생리적 휴면을 보였고, 금꿩의다리, 자주꿩의다리 및 연잎꿩의다리는 각각 약 87%, 96% 및 100%가 형태 생리적 휴면을 보였다. 한 종 내에서도 형태적 휴면과 형태 생리적 휴면을 동시에 가지고 있었다. 따라서 미숙배가 발아 지연의 원인으로 판단되었다. 이 결과들은 추후 한반도 자생식물의 형태학적 종자휴면을 연구하는데 유용한 자료가 될 것이다.

Keywords

References

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