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Efficient Regeneration from Foliage Leaf and Immature Spathe Explants of Garlic
Do Sun Kim(김도선),Yul Kyun Ahn(안율균),Jong Gyu Woo(우종규) 한국원예학회 2008 한국원예학회 학술발표요지 Vol.2008 No.12
마늘은 생장점 유래의 캘러스 배양으로 Agrobacterium을 이용한 형질전환이 어려운 실정이므로, 엽절편체 및 미숙총포 조직을 이용한 고효율 재분화 체계를 개발하고자 하였다. 난지형 및 한지형 마늘 4개 품종의 보통엽을 발아시기별, 절편크기별로 처리한 결과 2,4-D 0.1㎎ L<SUP>-1</SUP>와 BA 0.1㎎ L<SUP>-1</SUP>가 첨가된 배지에서 계대배양하는 것이 callus 형성률이 높았다. 마늘 발아 후 신초 1.0-2.0㎝ 시기의 보통엽 조직에서 체세포 유사 구조의 캘러스 형성률이 높았고, 첫 번째 보통엽 절편에서만 캘러스가 유기되었다. 이들 캘러스는 10㎎ L<SUP>-1</SUP> BA가 첨가된 배지에서 완전한 식물체로 재분화되었다. 미숙총포 절편은 NAA 1.0㎎ L<SUP>-1</SUP>, BA 1.0㎎ L<SUP>-1</SUP>의 배지조건에서 높은 재분화를 보였다. 또한 이들 식물체는 6% sucrose가 함유된 MS 기본배지에서 다수의 구를 생산할 수 있었다. Plant regeneration of garlic was successfully established from foliage leaf and immature spathe explants. The foliage leaf explants of four garlic (Allium sativum L.) cultivars were cultured on LS medium containing 0.1 ㎎L<SUP>-1</SUP> 2,4-D and 0.1 ㎎L<SUP>-1</SUP> BA with different sampling stages and explant sizes. Callus was induced from the first foliage leaf explants only. Larger sized (0.5 ㎝) foliage leaf explants were the highest in callus formation during sprouting stage of 1.0-2.0 ㎝ leaf. These calli from foliage leaf explants were very similar with somatic embryos in appearance. When these calli from foliage leaf explants were transferred to the differentiation medium containing 10 ㎎L<SUP>-1</SUP> BA, the shoots differentiated normally. Shoot regeneration and in vitro bulblet formation from immature spathe explants were rapid and efficient on MS medium containing 1.0 ㎎L<SUP>-1</SUP> NAA, 1.0 ㎎L<SUP>-1</SUP> BA, and 6% sucrose. Results indicate that immature spathes are more suitable explants for transformation than the calli from foliage leaf explants, since these tissues need longer time for regeneration and result in very low regeneration frequency.
청소년의 일반긴장 요인이 사이버비행에 미치는 영향 - 스마트폰 의존도의 조절된 매개효과를 중심으로 -
김도선 ( Kim Do Sun ),정임수 ( Jung Im soo ),이창배 ( Lee Chang Bae ) 한국경찰학회 2021 한국경찰학회보 Vol.23 No.4
The purpose of this study is to verify that dependency on smartphone use can act as a moderated mediating effect in the relationship between general strain and cyber delinquency. The findings of this paper show that impulsiveness has a partial mediating effect that slightly reduces the impact of parental strain and friend strain on cyber delinquency. The moderated mediating effect of dependency on smartphone use on general strain factors and the cyber delinquency, was found to have a positive(+) effect on cyber-delinquency in the relationship of the parent strain-impulse-cyber delinquency. Whereas, only when dependency on smartphone use is moderate or high, it was found to have a positive(+) effect on cyber delinquency in terms of the friend strain-impulse-cyber delinquency. The point to take home here is that dependency on smartphone use can indirectly increase cyber delinquency in the relation of general strain and cyber delinquency. Based on the results of this study, we discussed how it can be applied to programs for subsequent studies and prevention, and suppression of cyber delinquency for the verification of influencing factors for future youth cyber delinquency.