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기내 배양을 통한 국내 콩(Glycine max L.) 품종의 식물체 재분화

Plant Regeneration by in vitro Tissue Culture in Korean Soybean (Glycine max L.)

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초록

적 요국내 콩 품종의 기내 재생 효율을 개선하고자 국내 장려품종인 우람, 진품2호, 청자3호, 태광콩 품종의 기관형성 및 자엽 크기별 체세포배발생을 검토하였다. 식물체 조직절편 부위별 (자엽, 배축, 자엽+배축 절편) 신초 형성율을 조사한 결과, 자엽과배축을 포함한 절편(자엽 + 배축)이 절편 당 분화된 신초수가 가장 많았다. 반면에 자엽 절편과 배축 절편에서는 신초가 형성되지 않았다. 배지 종류별로는 B5 배지보다 MS 배지에서 신초형성이 양호했으며, BA 2 ㎎/L 처리구가 TDZ 2 ㎎/L을 첨가한 배지보다 신초 형성율이 높았다. 공시한 4 가지 품종 중 태광콩이BA 2 ㎎/L를 포함한 MS배지에서 신초형성율이 83.3%로 가장높았다. 또한 체세포 배발생을 통한 캘러스 유도율을 조사하기위하여 미성숙 자엽을 크기(S: 1~2 ㎜, M: 3~5 ㎜, L: 6~8 ㎜) 별로 구분하여 배양한 결과, 4 가지 품종 모두 중간 크기(M, 3~ 5 ㎜)에서 가장 높았으며, 태광콩이 65.8%로 가장 높은 캘러스유도율을 보였다.

Abstract

Plant regeneration via organogenesis and somatic embryogenesis was investigated in Korean soybean cultivars including Cheongja 3, Jinpumkong 2, Taekwangkong and Uram. Cotyledon, cotyledon+hypocotyl and hypocotyl segments of 7-day-old seedlings were cultured on MS medium containing various concentration (0, 1, 2 and 4 ㎎/L) of BA and TDZ. The results showed that MS medium supplemented with BA 2.0 ㎎/L yielded the highest shoot formation ratio of 83.3%. In 4 cultivars, Taekwangkong showed the highest ratio of shoot formation. When various sizes of immature cotyledons (S: 1∼ 2 ㎜, M: 3∼5 ㎜, L: 6∼8 ㎜) were tested on MS medium containing 2,4-D 40 ㎎/L for somatic embryogenesis, the optimum size for embryogenic callus induction was 3∼5 ㎜ in length of immature cotyledons. In 4 cultivars, Taekwangkong showed the highest percentage of embryogenic callus induction. The results indicate that Taekwangkong is the best soybean cultivar for plant regeneration via organogenesis and embryogenic callus induction among the 4 cultivars. Key words - BA, Callus, Organogenesis, Somatic embryogenesis, Soybean, TDZ

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