불투수성 황근 종자의 발아적온 규명
Optimal Germination Temperature of Impermeable Hamabo Mallow (Hibiscus hamabo Siebold & Zucc.) Seeds
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초록
경실 목본으로 발아가 잘 안 되는 황근 종자를 농황산으로 경피파상처리를 한 후 표준발아시험을 실시하여 발아의 최적온도를 규명하고자 하였다. 종자의 불투수성 해소를 위한 황산처리시간은 20~30분처리가 가장 적합한 것으로 나타났고 20분이나 30분 처리 모두 29℃에서 가장 높은 발아율을 나타내었다. 그러나 30분 처리의 경우 부패묘가 많고 발아속도지수 또한 낮아 20분 처리가 적정한 것으로 나타났다. 농황산에 20분간 처리한 후 수세하여 29℃에서 발아시켰을 때 경실종자수와 부패종자수가 적으며, 치상 8일 째에 72%의 높은 발아율을 보였다. 발아율과 발아속도를 동시에 나타내는 발아속도지수도 29℃에서 가장 높게 나타났다. 이로서 29℃는 다른 온도에서 보다 가장 빠른 시간 내에 가장 높은발아율을 보이므로 황근 종자의 발아최적온도라고 할 수 있겠다.
Abstract
The dormant seeds of hamabo mallow due to hard seed coat were subjected to seedscarification treatment with concentrated sulfuric acid and tested for dormancy-breaking andknowing optimal germination temperature with official germination test. The proper time ofsulfuric acid treatment for promoting water uptake is 20∼30 minutes. Seed sample showed themaximum germination percentage after 20 and 30 minutes sulfuric acid scarification at 29℃. However, 30 minutes treatment produced many seedling rot and low germination promptnessindex. Therefore, sulfuric acid for 20 minutes proved to be quite satisfactory in breaking thehard seed coat in hamabo mallow. Seeds treated with concentrated sulfuric acid and washedwith distilled water showed lowered number of hard seeds and decayed seeds and highergermination rate of 72% at 29℃ at 8 days after imbibition. Promptness index that reflectspercent germination and germination speed was higher at 29℃ than other temperatures. Thisresults suggested that the optimal temperature for hamabo mallow was 29℃ because thegermination rate was the highest and germination occurred most rapidly at 29℃.
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