Abstract
To investigate the cucumber regeneration from embryogenic calli, shoot tips of aseptically-grown cucumber seedlings were used as explants for establishing tissue cultures. Growth and differentiation of callus were studied by using Murashige and Skoog's (MS) medium containing 0.5 to 2 mg/L 2,4-D. Plantlets were induced from shoot tip culture on the plant growth regulators-free MS medium. Non-embryogenic calli and viscous calli were induced on the medium supplemented with 0.5 to 2 mg/L 2,4-D, but embryogenic callus was not induced on the same medium. Segments (ca. 5∼10 mm) of aseptically-grown hypocotyl from five to seven days old seedlings after germination were placed on MS medium supplemented with 1 mg/L 2,4-D for 50 days. Embryogenic calli and embryoids were induced only from the seedlings grown in dark condition, and hypocotyl was placed on the media explanted in light condition. Foully-five point one percent of white fragile calli and 0.6% yellowish compact calli formed roots. Yellowish callus lines were investigated to have a considerably higher concentration of crude proteins than white callus lines. Plantlets derived from embryogenic calli or embryoids have been transferred to pots containing sterile vermiculite and perlite. Normal fruits were harvested from nutrient culture on aggregated hydroponics in the F-clean house.
기내에서 무균적으로 생장시킨 오이 유묘의 경단조직과 하배축을 배양하여 캘러스 분화 및 생장에 대해 조사했다. 오이 경단조직을 생장조절물질이 첨가하지 않은 배지에서는 유식 물체로 분화하였으나 2,4-D가 0.5∼2 mg/L 첨가된 MS배지에서는 비배발생캘러스와 점액성캘러스가 유도되었고 배발생 캘러스는 분화되지 않았다. 그러나 유묘 육성시 암조건에서 발아 후 5∼7일 된 개체의 하배축을 5∼10mm크기로 절단하여 2,4-D가 1.0 mg/L이 첨가된 MS배지에 50일간 광조건에서 배양했을 때에는 배발생캘러스와 배상체가 분화되었다. 아울러 하배축 유래 비배발생캘러스 중 백색캘러스는 45.1％가 발근된 반면에, 노랑색캘러스는 불과 0.6%만 발근되었으며. 조단백질의 함량은 백색캘러스보다 노랑색캘러스가 월등히 많았다. 배발생캘러스와 배상체에서 발달된 소식물체는 순화과정을 거쳐 비닐하우스 내의 고형배지경에서 양액재배로 정상적인 과실을 수확하였다.
