사시나무 근삽수의 저온저장 처리가 클론별 근맹아 발생에 미치는 영향
Effect of the Chilling Treatment of Root Cuttings on Sprouting of the Root Suckers of Populus davidiana Dode
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사시나무(Populus davidiana Dode)는 동아시아에 분포하는 산지형 속성수이다. 우리나라에서는 이전에 치산녹화에 중요한 조림수종이었으며, 줄기 삽목에 의한 증식이 어려워 근삽(Root cutting)을 이용한 증식이 가능한 것으로 알려져 있다. 근삽은 줄기 삽목에 비하여 클론 개체를 얻는 효율이 낮기 때문에 근삽을 이용한 개체 증식을 시도할 때 많은 개체를 얻기 위하여는 근맹아 발생량을 높이기 위한 연구가 필요하다. 이에 본 연구는 사시나무 근삽수의 저온 저장 처리가 근맹아 발생 효율에 미치는 영향을 알아보고자 수행되었다. 근삽수는 오대 19호를 포함한 총 9개의 클론에서 채취되었다. 실험은 같은샘플들을 4℃와 24℃의 온도 조건에서 3주간 처리한 다음 항온 유지 온실에서 근삽목을 실시하였고,15주간 근맹아 발생을 관찰하며 진행되었다. 그 결과, 24℃ 대조구는 4℃ 처리구에 비하여 총 근맹아발생량이약 1.9배로 우수하였다. 처리구는 5주차까지 총 발생량의 95%가 발생하고 나서 8주차까지 총2개가 추가 발생한 후 모든 발생이 멈췄다. 반면에 처리구에서는 5주차까지 총 발생량의 52%가 발생하였으며, 그 후 14주차까지 37개의 근맹아가 불규칙적으로 추가 발생하였다. 본 실험을 통하여 저온처리를 한 사시나무 근삽의 근맹아 발생이 대조구에 비해 조기에 멈추는 것을 확인하였다. 향후 사시나무의근맹아 발생량을 높이기 위해서는 더욱 다양한 후속연구가 필요하다.
Abstract
Populus davidiana Dode is a fast growing species distributed mainly on the mountain area ofEast Asia. In Korea, it was an important planting species for management and greening duringthe early National Forest Plans. It is known to propagate well through root cutting because it isdifficult to grow by stem cutting. Since the efficiency of obtaining clones is lower than that ofstem cuttings, it is necessary to study to increase the productivity of root sucker in order toobtain a large number of individuals when attempting to multiply by using root cutting. For thisreason, we were carried out this study to knowthe influence of low-temperature storage treatmenton the generation efficiency of root sucker. Root cuttings were obtained from 9 clones includingOdae19. In the experiment, the same samples were treated at 4℃ and 24℃ for 3 weeks,followed by root cutting in a greenhouse and observed for 15 weeks. As a result, the 24℃control group was 1.9 times better than the 4℃ treatment group. In the initial amountof 2weeks, however, treatment group 60% was higher compared to the control group 33.8%. In the treatment group, 95% of the total amount was generated until the 5th week, and then 2 morewere added until the 8th. On the other hand, in the control group, 52% of total amount wasgenerated until 5th week, and then root suckers 37 were irregularly added until the 15th. In thisstudy, it was confirmed that the generation of root suckers of P. davidiana Dode with lowtemperaturestorage treatment stopped earlier than the control group. Further studies are neededto improve the generation amountof root suckers of P. davidiana Dode.
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