Effects of Cutting Condition on Growth of Rooted Cuttings and Cut Flower in Plug Cutting of Dendranthema grandiflorum 'Baekma'

Abstract

본 연구는 스탠다드 국화 '백마' 품종의 플러그 묘 생산에 있어서 삽수의 조건이 지상부 생육과 발근 및 정식 후의 절화 생육에 미치는 영향을 알아보고자 실시하였다. 삽수에 잎을 많이 부착할수록 삽목묘의 지상부 생육이 양호하였고, 잎을 4-6장 부착하여 삽목하는 것이 다른 처리에 비해 발근에 효과적이었다. 삽수길이에 따른 삽목묘의 지상부 생육은 큰 차이가 없었으며, 삽수길이를 5-7cm로 처리하는 것이 발근상태가 양호하였다. 삽수 굵기는 3.1mm 처리에 비해 3.6mm와 4.2mm 처리에서 삽목묘의 지상부 생육과 발근이 양호하였다. NAA 처리농도가 높을수록 삽목묘의 지상부 생육이 억제되었으며, 뿌리의 길이도 짧아졌다. NAA <TEX>$100mg{\cdot}L^{-1}$</TEX>를 1시간 처리하여 삽목하는 것이 삽목묘의 지상부 생육과 발근에 효과적이었다. 피트모스와 펄라이트를 2:2로 혼합한 배지에서 다른 처리에 비해 뿌리의 길이, 수 및 무게 등이 뿌리의 생육이 양호하였다. 잎이 적은 것보다 4-6개 부착된 삽수의 삽목묘를 정식했을 때, 절화장이 길고, 무게가 무거웠으며, 엽수도 많았다. 삽수길이에 있어서 7-9cm 처리가 절화장, 절화무게, 설상화 수 등 전반적인 절화의 생육에 효과적이었다. 따라서 '백마' 플러그 묘 생산시 7cm 길이에 3.6mm 굵기의 4-6장의 잎을 부착한 삽수를 삽목하는 것이 삽목묘의 지상부 생육과 발근 및 정식 후의 절화 생육을 위해 바람직하였다. This study was carried out to examine the effect of cutting condition on the growth of rooted cuttings and their subsequent growth of cut flower in plug cutting of Dendranthema grandiflorum 'Baekma'. The more leaves were attached to the cutting, the higher shoot growth of rooted cutting was observed. Cutting with two to six leaves was effective in shoot growth and rooting than any other treatment. Shoot growth of rooted cutting was not affected by cutting length, but rooting was better in 5 to 7 cm long cutting. Shoot growth and rooting of rooted cutting was promoted by increasing the cutting diameter, and rooting was better in 3.6-4.2 mm thick cutting than 3.1 mm thick cutting. As the treating concentration of NAA increased, shoot growth was inhibited and root length shortened in rooted cutting. Soaking with <TEX>$100mg{\cdot}L^{-1}$</TEX> <TEX>${\alpha}$</TEX>-naphtalene acetic acid (NAA) for 1 h was effective in shoot growth and rooting. Root growth such as root number, root length, and root weight was better in rooting medium mixed with 2:2 of peatmoss:perlite than the other treatments. When rooted cutting produced from cutting with four or six leaves was planted, better length, weight, and leaf number of cut flower was observed. In rooted cutting produced with 7-9 cm long cutting, growth of cut flower such as length, weight, and ray flower number was more effective than the others. Therefore, it is recommended that the 7 cm long and 3.6 mm thick cutting with four to six leaves is used to improve their rooting and subsequent growth of cut flower in plug cutting of Dendranthema grandiflorum 'Baekma'.