녹지삽목에 의한 고로쇠나무류의 대량증식 : 삽수의 발근에 미치는 삽목시기, 삽수의 부위 및 옥신처리의 효과
Mass Propagation of Acer spp. By Greenwood Cutting : Effects of Cutting Time, Cuttings Position on Shoots, and Auxin on Rooting Characteristics
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고로쇠나무, 붉은고로쇠나무, 우산고로쇠나무 실생묘(6년생)의 녹지삽목 대량증식 방법을 밝히기 위해 수종별로 삽목시기, 삽수부위 및 옥신처리를 하여 자동안개관수장치가 설치된 무가온 비닐하우스에 삽목을 실시하였다. 고로쇠나무류의 삽목 후 발근 개시일과 완료일은 고로쇠나무가 20일과 45일, 붉은고로쇠나무와 우산고로쇠나무는 30일과 60일로 나타났다. 3수종의 삽목 발근율에 대한 삽목시기, 삽수부위, 옥신의 처리 효과는 모두 고도의 유의적인 차이(P<0.0001)가 나타났고, 뿌리수는 옥신처리 간에만 고도의 유의성(P<0.0001)이 인정되었다. 삽목시기의 효과는 7월 1일 삽목의 평균 발근율이 73.0%로 6월 1일 삽목(51.6%)보다 21.4% 이상 높았고 뿌리수와 뿌리길이의 발달도 좋았다. 삽수부위의 효과는 하단부의 발근율(72.4%)이 상단부보다 20.2% 높고, 뿌리수와 뿌리길이는 유의적인 차이가 없었다. 각 수종에 공통적으로 적용할 수 있는 옥신처리는 IBA 100ppm과 무처리로 높은 발근율을 보였으나 뿌리발달은 좋지 않았다. 각 처리에 대한 상호작용의 발근 효과에서 발근율은 3수종 모두 고도의 유의성(P<0.0001)이 인정되었으며, 뿌리수에 대한 상호작용은 수종마다 달랐다. 발근율이 가장 좋은 각 처리 조합은 고로쇠나무의 경우 7월 1일 삽목시기+하단부+무처리로 발근율이 100%로 나타났고, 붉은고로쇠나무는 7월 1일 삽목+하단부+IBA 100ppm(96.7%)이었으며, 우산고로쇠나무는 7월 1일 삽목+하단부+무처리(88.7%)가 가장 좋은 발근율을 나타냈다.
Abstract
This study was conducted to develop an efficient mass propagation method for Acer mono, A. mono for. rubripes, A. okamotoanum seedlings (6 years old). For each species, categories of cutting time, cuttings position on shoots, and auxin treatments were tested. Greenwood cutting was carried out in an unheated greenhouse equipped with fog system. The dates of commencement of rooting after taking cuttings were 20 days for Acer mono and 30 days for Acer mono for. rubripes and Acer okamotoanum, respectively. The dates of completion of rooting after taking cutting were 45 days for Acer mono and 60 days for Acer mono for. rubripes and Acer okamotoanum, respectively. For the 3 species, according to the categories of cutting time, cuttings position on shoots, and auxin treatments, highly significant difference (P<0.0001) was observed in rooting rate. However, depending on different auxin treatment, highly significant difference (P<0.0001) was recognized only in the number of roots. The highest average rooting rate was observed in cutting time of July 1st (73.0%) which was 21.4% higher than that of June 1st (51.6%). The development of roots and root length was also best in cutting time of July 1st. For cuttings position, rooting rate of the lower part (72.4%) was 20.2% higher than the upper part but there was no significant difference in the number of roots and root length. For each species, commonly appliable auxin treatment was turned out to be IBA 100ppm and control(no auxin treatment) where high rooting rate and poor root development was observed. For interaction effect of rooting for each treatment, high significance (P<0.0001) was recognized on the rooting rate in all three species. However, each species showed different interaction effect on the number of roots. Best combination for rooting rate was composed of cutting time of July 1st, the lower part, and control for Acer mono (100%). For Acer mono for. rubripes, that was composed of cutting time of July 1st, the lower part, and IBA 100ppm (96.7%). For Acer okamotoanum, that was composed of cutting time of July 1, the lower part, and control (88.7%).
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