방사무늬김 (Neopyropia yezoensis)과 잇바디돌김 (Neopyropia dentata)의 양식초기 환경 스트레스에 따른 생장 특성 비교
Comparison of growth characteristics of Neopyropia yezoensis and Neopyropia dentata on the environmental stress in early stage of cultivation
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본 연구에서는 안정적인 김 양식을 위해 방사무늬김과 잇바디돌김의 양식 초기 환경 스트레스에 따른 생장 특성을 조사하였다. 그 결과 수온과 조도 조건에 따른 품종간 생장은 뚜렷한 차이를 나타냈으며 방사무늬김보다 잇바디돌김이 취약한 환경에서 생장이 더 높은 것으로 확인되었다. 조도 조건은 두 품종 모두 40 μmol photons m-2·s-1보다 80 μmol photons m-2·s-1에서 생장이 우수했으며, 수온의 경우 방사무늬김은 22°C 이상, 잇바디돌김은 26°C 이상에서 생장이 저해되는 것으로 확인되었다. 수온과 조도 조건이 생장에 미치는 영향은 1 mm 엽체보다 10 mm 엽체에서 더 큰 것으로 조사되었다. 이러한 연구 결과를 바탕으로 기후변화에 대비하여 품종간 채묘 및 양성 시기 조절을 통해 김 양식 피해를 최소화해야 할 필요가 있다고 판단된다.
Abstract
This study compared relative growth rates (RGRs) of Neopyropia yezoensis and Neopyropia dentata in response to changes in water temperature (20, 22, 24, 26 and 28°C) and light intensity (40 and 80 μmol m-2·s-1) during early growth stages (1 and 10 mm). After 2 weeks of cultivation under a combination of high temperature and light intensity, the limit growth condition was 22°C for N. yezoensis and 26°C for N. dentata. N. yezoensis with 1 mm blade crimpled seriously at 22 to 26°C than its 10 mm blade. Both sizes were completely dead at temperature over 26°C. On the other hand, N. dentata was able to grow at relatively high temperatures. It grew higher with 10 mm blade than with 1 mm blade. N. dentata showed a normal color and displayed a flat surface without any decay at 28°C. The growth of N. dentata was limited and crimpled at 26 and 28°C 40 μmol photons m-2·s-1 conditions, although its normal growth and morphology were observed under other conditions. In the case of light intensity, it was confirmed that 80 μmol photons m-2·s-1 was more appropriate for grow of both species than 40 μmol m-2·s-1.
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