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Influences by position of node and existence of leaf on microtuberization in node culture of potato

감자절간배양에서 마디위치 및 잎의 부착유무에 따른 소괴경형성의 차이

  • Hwang, Hye-Yeon (Department of Horiculture, Chungnam National University) ;
  • Lee, Young-Bok (Department of Horiculture, Chungnam National University)
  • 황혜연 (충남대학교 농업생명과학대학 원예학과) ;
  • 이영복 (충남대학교 농업생명과학대학 원예학과)
  • Published : 2008.03.31

Abstract

Single-node stem pieces ca. 1 cm in length containing a axillary bud were obtained from in vitro plants of potato (Solanum tuberosum L.). The influences by a position of the node and the existence of a leaf at the node were observed in the single-node culture on the 8% sucrose MS medium. The effect of CCC was also investigated for the microtuberization. The apical part node was excellent in the tuberization not to mention shoot length, fresh weight, diameter, the number of node on the in vitro culture of a single-node than the lower part. The differences in the diameter of a tuber formed in the part of the axillary bud on all treatments including the cultivation of the apical part node were not recognized. However, the fresh weight of the tuber showed high value in the tuber formed at the axillary bud of shoot apex part. At 20 days after cultivation, tuberization was promoted in the new stolen that developed from the bud of node with a leaf under SD condition of 8 hours at $20^{\circ}C$. The tuberization from axillary bud of the single-node without leaf was inhibited at high temperature of $28^{\circ}C$ regardless of daylength. Whereas, tuberization at $20^{\circ}C$ and $28^{\circ}C$ was similar without the difference under SD condition but the tuber formation ratio were low. CCC 500 mg/L promoted tuberization and the effect was also showed even under LD condition at $28^{\circ}C$. The inhibiton of tuberization under LD and high temperature condition could be solved by treatment with CCC.

감자의 마디배양에서 이식하는 마디의 위치에 따라 기내 소괴경 형성에 미치는 차이와 배양하는 마디조직체에서의 잎의 유무가 기내소괴경의 형성에 미치는 온도, 일장 및 CCC의 영향을 검토하였다. 마디의 위치에 따른 감자의 생육에 있어서는 초장, 생체 중, 직경, 마디수는 물론 괴경형성에 있어서도 정단부위가 하부부위보다 양호하였다. 액아의 부위에서 형성된 소괴경의 직경에 있어서는 정단부를 포함한 모든 처리구에서 큰 차이를 확인할 수 없었으나 괴경의 생체중은 정단부위의 액아에서 형성된 괴경에서 높은 수치를 보였고 다른 마디에서는 개체간의 큰 차이가 없었다. 잎의 부착 유무와 온도와 일장에 따른 괴경형성에 있어서는 잎이 부착된 마디를 $20^{\circ}C$의 단일조건에서 배양할 때 양호하였으나, 고온에서는 괴경형성이 일장에 관계없이 저조하였다. 잎이 부착되지 않은 마디에서의 괴경형성은 저온과 고온 모두 단일조건에서 양호하였다. CCC처리에 의한 효과에 따른 감자의 생육에 있어서 초장, 생체중, 직경, 마디수는 CCC를 첨가한 배지에서 양호하였고 특히 일장 처리가 길어질수록 양호한 결과를 보였다. 괴경형성을 촉진시키는데 일장이 짧을수록 양호하였고, CCC를 첨가한 배지에서 양호한 효과를 보였다.

Keywords

References

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