실고사리(Lygodium japonicum (Thunb.) Sw.) 포자발아와 전엽체 발달조건

Abstract

본 연구는 실고사리 포자를 이용한 효율적인 증식방법을 마련하기 위해 배지종류, 배양온도, 광질 조건 등 배양환경을 규명하고자 수행되었다. 포자 발아율과 전엽체 발달은 무기물 함량이 낮은 Knop 배지와 1/8MS, 1/4MS 배지에서 74% 이상으로 높고, 심장형 전엽체로 발달되었다. 그러나 무기물 함량이 가장 적은 Knop 배지에서는 전엽체 노화가 빠르게 진행되었고 1/4MS 배지에서는 전엽체 증식이 다소 느렸다. 온도에 따른 발아율은 배양온도가 증가할수록 높아져 30℃에서 86.7%로 가장 우수하였으나, 25℃에 비해 전엽체가 얇고, 가근이 비정상적으로 발달되어 실고사리 포자의 발아적온은 25℃로 규명되었다. 광질에 의한 발아율은 LED red에서 90.6%로 형광등(77.2%)과 LED blue (5.4%)에 비해 높았고, 심장형 전엽체로 발달이 진행되었으나 파종 15일 후에는 전엽체 발달이 감소하고 길어졌다. 반면 형광등에서는 정상적인 심장형 전엽체 발달이 진행되었다. This study was conducted to determine the optimal conditions of growth medium, temperature, and light quality for efficient propagation of Lygodium japonicum spores. The rate of spore germination and prothalium development was high in Knop and 1/8MS and 1/4MS media, which had low mineral content; in particular, the germination rate exceeded 74%, and the germinated spores developed into heart-shaped prothallia. However, in Knop‘s medium with the lowest mineral content, a rapid prothallium senescence was observed; in 1/4MS medium, prothallium development was delayed. Germination rate increased with the increase in temperature and reached its maximum, 86.7%, at 30℃; however, at this temperature, the prothallia were thinner and abnormal development of rhizoids was observed compared to normally developed prothallia and rhizoids at 25℃. Therefore, the results suggested that the optimal temperature for L. japonicum spore germination was 25℃. The rate of germination was also measured under different light conditions, and the highest rate of 90.6% was observed under LED red light compared to fluorescent (77.2%) or LED blue (5.4%) lights. The germinated spores developed into heart-shaped prothallia under LED red light; however, 15 days after seeding, prothallium development decreased and the became elongated. In contrast, a normal and continuous development of heart-shaped prothallia was observed under fluorescent light.