Bioassay and Quantification of Causative Allelochemicals from the Extracts and Residues of Sweet Potato (Ipomoea batatas) Plant Parts = 고구마 부위별 추출물과 잔류물로부터 타감물질의 생물검정 및 정량분석

국문 초록 (Abstract)

고구마의 잎, 줄기 및 뿌리 부위의 물 또는 메탄올 추출물 그리고 잔류물의 잠재적인 타감작용 효과를 검토하고자 실험실과 온실건조의 시험이 병행되었다. 고구마 품종 신율미의 물추출물 40g L-1에서 식물체 부위와 관계없이 알팔파에 대해 가장 높은 억제를 보였다. 알팔파 뿌리신장은 고구마 식물체 부위별 메탄올 추출물의 농도 증가에 따라 유의적으로 억제되었다. 알팔파 뿌리생장 억제는 고구마 줄기와 뿌리보다는 잎으로부터 물 또는 메탄올 추출물에서 더 크게 나타났다. HPLC 분석에 의한 주요한 페놀 화합물 chlorogenic acid와 caffeic acid의 함량이 잎 메탄올 추출물에서 가장 높았고 줄기와 뿌리 순으로 나타났다. 그러나 뿌리 잔류물이 잎과 줄기 잔류물보다 혼화처리된 토양에서 강피의 지상부 및 지하부 생장을 더 크게 억제하였다. 이상의 결과로 고구마 식물체는 그 추출물과 잔류물에 의한 잠재적 타감작용을 갖고 있었으며 그들의 활성은 식물체 부위와 추출방법에 의해 달리 나타났을을 확인하였다.

다국어 초록 (Multilingual Abstract)

Laboratory and greenhouse experiments were conducted to determine the allelopathic potentials of aqueous or methanol extracts and ground residues of sweet potato (Ipomoea batatas cv. ‘Sinyulmi’) plant parts, leaves, stems, and roots. Aqueous leachates at 40 g dry tissue L-1 (g L-1) from sweet potato cultivar ‘Sinyulmi’ showed the highest inhibition against alfalfa (Medicago sativa) regardless of plant part. Alfalfa root growth was significantly inhibited by the methanol extracts of sweet potato as the concentration increased. The inhibitory effect on alfalfa root growth was greater in aqueous and methanol extracts from leaves than from stems and roots at higher concentrations. By means of HPLC analysis, methanol extracts from sweet potato leaves had the highest amount of phenolic compounds including mainly chlorognic acid and caffeic acid, and followed by those from stems and roots. Root residues showed the highest inhibition against shoot and root growth of barnyardgrass, compared to leaf and stem residues. Incorporation with root residues of above 50 g kg-1 into soil significantly inhibited shoot and root fresh weights of barnyardgrass. These results suggest that sweet potato plants had allelopathic potential, and that their activities were differential depending on plant part as well as extraction method.

목차 (Table of Contents)

• ABSTRACT INTRODUCTION MATERIALS AND METHODS RESULTS AND DISCUSSION 요약 LITERATURE CITED

참고문헌 (Reference)

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