Effects of Some Environmental Factors on Japanese Yew (Taxus cuspidata Sieb. et Zucc.)

몇 발근환경인자(發根環境因子)가 주목삽수(揷穗) 발근(發根)에 미치는 효과(効果)

The purpose of this experiment lies in finding the most appropriate cutting condition of Taxus cuspidata Sieb. et Zucc. which has been considered valuable tree species in gardening. Statistical analysis was focused on the comparison of the average ratios of rooting between greenhouses and fields, based on the observation rooted autogenis. To conduct this survey, hardwood cutting of Taxus cuspidata Sieb. et Zucc. were performed at both places of experiment above on April 20, 1982 with rooting results calculated on October 31, 1982. After formation of cuttings, it was soaked in IBA 200 ppm for 12 hours and than put in a bed. A summary of the result is presented as follows; 1) Cutting at the greenhouse showed higher average rate of rooting than at fields. Same tendency was found regardless of the differences in treatment. 2) It was clear that IBA-treatment contributed remarkably to causing higher average rooting rate. As an evidence, when twenty centimeter cuttings were inserted sandy media, IBA-treated area resulted in eighty six percent of average rooting rate, as compared with only twenty three percent in nontreatment case. In case of field cutting, IBA-treatment brought about fifty three percent of rooting in comparison with eleven percent nontreatment. 3) When sandy soil, loam and brown soil were separately used as cutting media, the highest rooting rate was found in case of sandy soil, without any difference between the two experimental places above. 4) As a result of the analysis to seek the impact of the length of cuttings on rooting, the range of length form fifteen to twenty centimeter was apparently most appropriate. It was also found that the rate of rooting declined beyond twenty five centimeter. 5) Two kinds of rooting pattern were observed. One was the case that callus cell lump was created on the lower cut side of cuttings. Importantly, root radical were formed inside the lump to influence the germination of root system. The other relates to the case that adventitious root which look like lateral roots appeared at the stem region. In abstract, first, sandy soil was effectively recommended in case of hardwood cutting in April. Second, the most appropriate length of cuttings ranged between fifteen and twenty centimeters. Third, high density IBA treatment was clearly effective. Forth, for proper environmental management, both pre-disinfection of sail by sterilizer and maintenance of high relative humidity were essentially required.

주목(朱木)(Taxus cuspidata Sieb. et Zucc)의 휴안지삽수(休眼枝揷穗)를 1982년(年) 4월(月) 20일(日)에 온실내(温室內)와 포지조건(圃地條件)에서 삽목(揷木), 당년(當年) 10월(月) 31일(日)에 발근개체(發根個體)를 가지고 평균발근율(平均發根率)을 계산(計算)하여 통계분석(統計分析)하였다. 본(本) 실험(實驗)의 목적(目的)은 원예적(園藝的)으로 가치(價値)를 평가(評價)받고 있음에 착안하여 가장 합리적(合理的)인 삽목조건(揷木條件)을 찾아내는 데 있다. 결과(結果)를 요약(要約)하면 다음과 같다. 1) 온실내삽목(温室內揷木)은 포지삽목(圃地揷木)에 비해 평균발근율(平均發根率)이 높았다. 이것은 처리별(處理別)의 차이(差異)에 불구하고 같은 경향(傾向)을 나타내었다. 2) IBA처리구(處理區)는 무처리구(無處理區)에 비해 더 높은 평균발근율(平均發根率)을 보였다. 온실내삽목(温室內揷木)의 경우 IBA처리구(處理區)는 평균발근율(平均發根率) 86%, 무처리구(無處理區) 23%, 포지삽목(圃地揷木)인 경우 IBA처리구(處理區) 53%, 무처리구(無處理區) 11%이다. 이것은 모두 삽수장(揷穗長) 20cm, 그리고 사토배지(砂土培地)에 삽목(揷木)되었을 경우이다. 3) 삽목배지(揷木培地)로서 사토(砂土), 양토(壤土), 갈색토(褐色土) 중(中) 온실내삽목(温室內揷木)이나 포지삽목(圃地揷木) 공히 사토구(砂土區)가 가장 높은 발근율(發根率)을 보였다. 4) 삽수장(揷穗長)이 발근(發根)에 마치는 영향을 분석(分析)한 바 15~20cm가 발근(發根)에 적당하고 25cm 이상은 발근율(發根率)이 떨어지는 것으로 나타났다. 5) 고찰(顧察)에 의한 발근양식(發根樣式)은 삽수하단절단면(揷穗下端切斷面)에 켈루스세포괴(細胞塊)가 생기고 그 안에 근기(根基)가 만들어져 근계형성(根系形成)에 관여하는 경우와 삽수(揷穗)의 경부(莖部)에 측근(側根)모양으로 나타나는 불정근(不定根)의 경우이다.