Korean Journal of Plant Resources (한국자원식물학회지)

The Plant Resources Society of Korea (한국자원식물학회)
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Effect of Temperature and Sodium Chloride on Seed Germination of Thuja orientalis

온도 및 염화나트륨이 측백나무 종자 발아에 미치는 영향

  • Tak Woo-Sik (Department of Forest Genetic Resources, Korea Forest Research Institute) ;
  • Kim Tae-Su (Department of Forest Genetic Resources, Korea Forest Research Institute) ;
  • Choi Chung-Ho (Department of Forest Genetic Resources, Korea Forest Research Institute)
  • 탁우식 (국립산림과학원 산림유전자원부) ;
  • 김태수 (국립산림과학원 산림유전자원부) ;
  • 최충호 (국립산림과학원 산림유전자원부)
  • Published : 2006.02.01
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Abstract

This study was conducted to investigate effect of temperature and NaCl on the seed germination and water absorption of Thuja orientalis. Seeds were treated with 0, 500, 1,000, 2,000 and 4,000ppm of NaCl and placed in different chambers at 15, 20, 25 and $30^{\circ}C$, respectively. And seed properties and relative water absorptions were analyzed. Germination decreased with the increase of both temperature and NaCl concentration, and especially the difference was obvious at $30^{\circ}C$. Dormancy and mortality increased with the increase of temperature in non-NaCl treatment. Two-way analysis of variance showed significant effects of temperature, NaCl concentration and interaction between temperature and NaCl concentration (p<0.001). Mean germination time increased with the increase of NaCl concentration at 15, 20 and $25^{\circ}C$ but decreased at $30^{\circ}C$ because the seeds were mortal by NaCl high concentration, Germination speed and germination performance index decreased with the increase of NaCl concentration. Those represented decreasing tendency with NaCl concentration but high positive correlation with germination. Relative water absorption decreased with the increase of NaCl concentration and represented high values at $15^{\circ}C$, and showed high positive correlations with germination, germination speed and germination performance index. It was reported that the high temperature and salinity were inhibitive factors of seed germination of Thuja orientalis.

온도 및 NaCl 등의 외부 환경인자에 노출되었을 때 나타나는 측백나무 종자의 발아특성을 조사하고 불량환경에 대한 내성 및 적정 환경조건을 알아보고자 본 연구를 실시하였다. 15, 20, 25, $30^{\circ}C$의 온도조건에서 NaCl 용액을 0, 500, 1,000, 2,000, 4,000ppm의 5수준으로 분주하여 종자발아특성 및 상대수분흡수율을 조사하였다. 발아율의 경우 $15^{\circ}C$ 온도에서 가장 높게 나타났으며 NaCl에 의한 감소의 폭도 가장 작았다. 반면, $30^{\circ}C$에서는 모두 현저히 낮게 나타났다. 휴면율과 고사율은 대부분 고온으로 갈수록 높게 나타났다. 특히, 휴면율은 $30^{\circ}C$에서 그 차이가 현저하였으며, 고사율에 비해서도 높은 수치를 보였다. 온도 및 NaCl의 농도에 대한 상호연관성을 알아보고자 two-way ANOVA 분석을 실시한 결과 두 요인 및 요인간 상호작용에서 유의성이 인정되었다(p<0.001). 평균발아일수는 온도 및 NaCl 농도가 증가함에 따라 대체적으로 증가하는 경향을 보여 발아가 지연되었음을 나타냈다. 그러나 $30^{\circ}C$에서는 NaCl의 독성에 의해 고사종자가 발생하여 증가 후 감소하는 경향을 나타냈다. 발아속도와 발아균일지수는 온도 및 NaCl 농도가 증가함에 따라 감소하였다. 상대수분흡수율은 $15^{\circ}C$에서 가장 높게 나타났으며, NaCl 농도가 증가함에 따라 감소하는 경향을 보였다. 또한 발아율, 발아속도 및 발아 균일지수와 높은 정(+)의 상관을 나타내었다. 결과적으로, 고온과 염류는 측백나무 종자의 발아를 저해하는 요인으로 작용하므로 발아율, 발아속도 및 발아균일지수의 감소를 줄이기 위해 노지 파종시 이들 요인에 대한 고려가 필요할 것으로 사료된다.

Keywords

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