Korean Journal of Plant Tissue Culture (식물조직배양학회지)

The Korean Society of Plant Biotechnology (한국식물생명공학회)
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Characterization of Plants Induced by in vitro Culture of Leaf Blade-segments in a Variegated Tobacco (Nicotiana tabacum L. cv. BY-4)

Variegated 담배 (Nicotiana tabacum L. cv. BY-4)의 잎 절편 배양에 따른 재생 식물체의 특성

  • Published : 1999.10.01
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Abstract

Plantlets derived from leaf blade-segment culture of a variegated tobacco (Nicotiana tabacum L. cv. BY-4) that was induced by a heavy-ion ($^{14}N$) beam irradiation to proembryos, were characterized. When explants from both white and green sections of leaves of the variegated plant were cultured on MS medium containing 0.1 mg/L NAA and 1.0 mg/L BAP, the white sections yielded only white shoots, whereas the green sections generated approximately 47.2% green, 37.4% white and 15.4% variegated shoots. In the F1 generation of a green tobacco derived from the leaf blade-segment culture, the segregation ratio of green to white was 1,651:54. Furthermore, reciprocal crosses showed that all of the progenies was green, indicating that the variegation is not maternally inherited. When the signal intensity of photosynthesis genes was determined by DNA gel blot analysis using the variegated leaves derived from green sections of variegated leaves, there were more of the rbcL, psbA, 16S rDNA and 23S rDNA chloroplast genes in the white sections than the chloroplast genes in wild type and green sections of the variegated plants.

수분 후 담배의 배에 중이온 ($^{14}$ N) beam을 조사하여 유도한 variegated담배의 잎 조직을 기내배양하여 재생된 식물체의 특성을 조사하였다. NAA 0.1mg/L 와 BAP 1/0mg/L를 첨가한 MS배지에서 variegated담배의 잎을 배양하면 백색부위에서는 백색 식물체만이 유도되었으나 녹색부위에서는 녹색 식물체가 47.2%, 백색 식물체가 37.4%, variegated식물체가 15.4% 유도되었다. 재생된 녹색 식물체는 자가수분한 후대 (F$_1$)에서 녹색 식물체 1,651 개:백색 식물체 54개로 분리되었다. 또한 variegated 잎에서 재생된 녹색 식물체와 정상주를 정역교배 한 결과, 전부 녹색체가 분리되었다. 이 결과는 variegated잎의 표현형 유전은 최소한 모성 유전이 아님을 보여준다. Variegated잎의 녹색부위를 배양하여 재생된 variegated식물체의 잎을 이용하여 DNA gel blot한 결과, 엽록체 유전자인 psbA, rbcL, 165 rDNA, 23S rDNA의 양은 흰색부위 잎에서 정상주인 녹색 잎과 variegated식물체 잎의 녹색부위 보다 많았다.

Keywords

References

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