Korean Journal of Plant Tissue Culture (식물조직배양학회지)

The Korean Society of Plant Biotechnology (한국식물생명공학회)
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Effects of Ammonium, and Nitrate on Callus Growth of Tobacco and Soybean and Activities of Nitrogen Metabolizing Enzymes

암모늄태와 질산태 질소가 담배와 콩의 조직배양시 생육 및 질소대사 효소의 활성에 미치는 영향

  • Published : 1998.01.01
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Abstract

Soybean and tobacco tissue cultured with modified MS media containing 4 different ratio(as N) of nitrate to ammonium combination which were 3:0, 2:1, 1:2 and 0:3. The highest callus growth in soybean were observed in the 2:1 medium. The medium containing nitrate only was detrimental to soybean callus growth. Tobacco callus grown with nitrate-only grew as well as those in the 2:1 and very slowly with ammonium-only. In tobacco callus, the total nitrogen in the callus increased with the increase of nitrogen concentration in the medium, but in soybean callus, the opposite result was noted. Nitrate reductase activity in tobacco callus was high when grown with nitrate-only but low with ammonium-only. In case of soybean callus, nitrate reductase activity was high in the 2:1 and remarkably low in nitrate-only medium. Both in soybean and tobacco callus, the activity of glutamine synthetase was high with nitrate-only, but low with ammonium.

본 실험은 질소원처리가 식물의 생육 및 질소대사에 미치는 영향을 규명하고자 조직배양을 실시하였으며 공시재료로는 담배 'NC 2326'와 대두 '단엽콩'을 사용하였다. 배지내 질소원의 종류와 그 비율을 달리했을 때 callus의 생육, 전 질소, 단백질 함량 그리고 nitrate reductase와 glutamine synthase의 활성 변화를 조사하였다. 단엽콩의 조직배양시 callus증식은 2:1처리구와 암모늄태 질소만 공급한 배지에서 높았던 반면 질산태만 공급한 경우 쉐는 callus증식이 저조하였다. 한편 담배는 질산태와 암모늄태 질소를 2:1로 혼용한 구가 callus증식이 좋았고, 암모늄태 질소단용구에서 저조하였으며, 질산태 질소단용구의 callus생육이 양호하였다. Callus내 전질소함량은 담배의 경우 배지내 질산태 질소가 많을수록 증가되어 질산태 질소단용구에서 가장 많았으며 암모늄태 질소단용구에서 가장 적었다. 한편 단엽콩은 이와 반대의 경향으로 암모늄태 질소단용구에서 가장 많았으며 질산태 질소단용구에서 가장 적었다. Callus의 nitrate reductase의 활성을 보면 담배는 질산태 질소단용구에서 활성이 높았으며 암모늄태 질소단용구에서 활성이 낮은 반면 단엽콩은 2:1 처리구에서 활성이 높았고 생육이 부진했던 질산태 질소단용구에서 현저하게 낮았다. Glutamine synthetase의 활성은 단엽콩, 담배 모두 질산태 질소단용구에서 활성이 높았으며 암모늄태 질소단용구에서 활성이 낮았다.

Keywords

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