Effect of tissue proliferation and somatic embryo induction in Larix kaempferi following treatment with organic nitrogen sources and plant growth regulators

This study was conducted to evaluate the effects of different types and concentrations of organic nitrogen sources (${\small{L}}$-Glutamine and casein hydrolysate, CH) and plant growth regulators (auxins and cytokinins) on embryogenic tissue proliferation and somatic embryo production in L. kaempferi. Overall, the highest tissue fresh weight was obtained at either 2 or 4 weeks in culture when 1,000 mg/L ${\small{L}}$-Glutamine was added to the culture medium, which showed similar results with other treatments. In experiments with different types and concentrations of plant growth regulators on somatic embryo production, the highest production (426.3/90 mg tissue) was found when 0.2 mg/L IBA was added; however, no somatic embryos were induced following treatment with 0.2 mg/L BA or Kinetin. The effect of various concentrations of IBA on somatic embryo production was also tested. The best result (303/90 mg tissue) was obtained when plants were treated with 0.2 mg/L IBA; 1.0 mg/L IBA was also effective (281/90 mg tissue). The lowest result (109.3/90 mg tissue) was obtained with 5.0 mg/L IBA.

일본잎갈나무(Larix kaempferi) 유기질소원 및 식물생장조절물질 처리에 따른 조직증식 및 체세포배 유도 효과

본 연구는 낙엽송의 배발생조직 증식 및 체세포배 유도에 영향하는 유기질소원(${\small{L}}$-Glutamine 및 casein hydrolysate, CH), 식물생장조절물질(옥신 및 사이토키니류)의 종류 및 농도의 효과를 평가하기 위해 수행되었다. 배발생조직 증식 비교에서 1,000 mg/L ${\small{L}}$-Glutamine 첨가 시 2주 혹은 4주 모두 가장 높은 조직생중량을 보였고 그 외 처리구에서는 대체로 유사하였다. 체세포배 유도에서는 0.2 mg/L IBA 첨가 시 가장 높은 426.3개를 유도하여 가장 효과적이었으나 0.2 mg/L BA 혹은 Kinetin처리구에서는 전혀 체세포배가 유도되지 않았다. IBA 농도 별 비교에서는 0.2 mg/L(303개)농도가 가장 좋았으며, 1.0 mg농도에서도 281개를 유도하여 체세포배 유도에 효과적이었으나 5.0 mg/L 첨가 시 109.3개로 가장 저조하였다.