On the rooting of the cuttings of two conifer species

송백류삽수(松柏類揷穗)의 발근(發根)에 관(關)한 연구(硏究)

Outdoor cuttings studies on two coniferous species, pitch pine and needle fir, have been made at Suwon, Korea extending from March to early May, 1956. The purpose of these studies was to find the effects of ages of parent trees, topophysis, dilute hormone solution treatments and the time at which the cuttings were collected on the rooting response of the cuttings. On September 2, rooting results were examined. Pitch Pine (Pinus rigida) The total of 1335 cuttings were collected from 3- and 10-year old trees. The cuttings treated were planted on March 13 and April 20. 1. In the cuttings collected from 3-year-old seedlings, the best result (34 percent rooted) was obtained by treating ends of cuttings with a mixture of 50 ppm IBA and 50 ppm NAA. 2. No rooting was observed in lammas shoots. 3. The cuttings from 3-year-old seedlings gave better rooting than those from 10-year-old trees. 4. The root origins were developed from the lower part of the cutting and the cut surface. Needle fir (Abies holophylla) One hundred twenty-five cuttings were collected from a 30-year-old tree. The cuttings treated with any one of four mixed hormone solutions were planted on March 23. 1. Fifteen cuttings out of 75 cuttings from the lower half of the crown were rooted. The cuttings obtained from the upper half of the crown did not root at all. 2. The cuttings treated by the hormone solution made up of 20 ppm IAA, 20 ppm IBA, 20 ppm NAA, 20 ppm thiamine and 5 percent sucrose gave the best rooting (22 percent). 3. All roots originated from callus tissues and irregularly arranged parenchymatous tissues near the cut base.

리기다소나무와 젓나무의 야외삽목(野外揷木)이 수원농과대학(水原農科大學) 임업묘포(林業苗圃)에서 1956년(年) 실시(實施)되었는데 다음과 같은 사실(事實)이 확인(確認)되었다. 리기다소나무(pinus rigida)에 있어서는 총 1335본의 삽수가 3년생 및 10년생의 모수에서 얻어지고 표(表)에서 보이는바와 같은 처리(處理)를 받고 3월(月) 13일(日) 및 4월(月) 20일에 삽목(揷木)되었다. 이에 있어서는 (1) 유령목(幼齡木)일수록 발근(發根)이 높다는것과 50ppm의 IBA 또는 NAA가 가장 좋은 결과(34 per cent)를 보여주었다. (2) lammas shoot에서는 전연 발근이 되지 않았다. (3) 삽목시기(揷木時期)가 또한 발근율(發根率)에 영향을 주었다. (4) 발근기원(發根起元)은 삽수(揷穗)의 하단부위(下端部位) 또는 절구(切口)에 생긴 Callus 부터였다. 젓나무(Abies holophylla)에 있어서는 30년생의 모수에서 삽수(揷穗)가 채취(採取)되었고 3월(月) 23일(日)에 삽목(揷木)되었다. 이에 있어서는 (1) 수관(樹冠)의 상반부(上半部)에서 채취(採取)된 삽수는 전연 발근(發根)하지 않았다. (2) 수관(樹冠)의 하반부(下半部)에서 얻어진 삽수(揷穗)에 있어서는 20ppm IAA, 20ppm IBA, 2)ppm NAA, 20ppm thiamine 및 5 percent sucrose의 혼함용액이 가장 좋은 발근율(發根率)(22 per cent)를 보여주었다. (3) 모든 발근(發根)은 불규칙(不規則)한 parenchymatous 조직(組織)에서 유래했었다.