支配實生(龍川뽕/改良뽕)의 生長點에 Colchicine 處理로 創成한 耐凍性系 4 倍體뽕 = Cold-hardiness Tetraploid Induced by Colchicine Treatment in Mulberry Seedings(Morus alba L. Yongchonppong/Kaeryanppong)

다국어 초록 (Multilingual Abstract)

Four tetraploid mulberry lines, Sawonppong No.11, No.13, and No.14, were induced by the colchicine treatment on the shoot tips of seedlings originated from the cross between Yongchonppong and Kaeryangppong. The major characteristics of the tetraploid lines were as follows; Green tip sprouting stage was similar to Kaeryangppong, a medium budding variety. Leaves were medium- to large-sized cordate type, Leaf surface was rougher and stronger than that of the diploid parents. Leaf thickness, leaf area weight and leaf water content were higher than those of the diploid parents. Average branch length was shorter than that of the diploid parents. Internode length and number of lateral branches were similar to the avarage value of the two parents. Death atop rate of branch was 1.6~2.5% indicating strong cold-hardiness of the tetraploid lines. Therefore, these line could be used as sources of cold-hardiness in developing triploid lines.