Codonopsis lanceolata (S. et Z.) Trautv. is mainly cultivated in Korea and China as a medicinal crop. C. lanceolata is difficult to produce plug seedlings in the summer, because C. lanceolata has a low germination rate and is vulnerable to high temperatures. Cold treatment is effective in breaking dormancy of seeds and increasing the germination rate. Shading cultivation can control the solar irradiance received by plants and reduce the damage by high temperatures and strong light. This study was conducted to examine the appropriate cold treatment period for the improving germination of C. lanceolata, and shading level during the summer seedling period. Cold treatment experiments were conducted for 0 (control), 1, 2, 3, and 4 weeks at 4°C before sowing. In the shading experiment, C. lanceolata was grown for 45 days with 0 (non-treatment), 45, 75% shading levels. Cold treatment for one week significantly improved the germination energy. The plant height, leaf area, and fresh and dry weights of C. lanceolata seedlings were significantly increased under the 45% shading level. Total root length, root surface area, and the number of root tips were significantly higher in shading treatment (45 and 75%) than in non-treatment. The C. lanceolata seedling’s compactness and Dickson’s quality index were the highest at 45% shading level. Therefore, these results recommended sowing C. lanceolata after cold treatment for one week at 4°C, and 45% shading level could stably culture C. lanceolata plug seedlings during the high temperature period.

Abstract
서 론
재료 및 방법
    1. 실험 재료 및 저온처리
    2. 발아 특성 조사
    3. 차광처리
    4. 생육조사
    5. 실험설계 및 통계분석
결과 및 고찰
적 요
사 사
Literature Cited

• 박은원(경상국립대학교 응용생명과학부 대학원생) | Eun Won Park (Graduate Student, Division of Applied Life Science, Graduate School of Gyeongsang National University)
• 황정훈(경상국립대학교 응용생명과학부 대학원생) | Jeong Hun Hwang (Graduate Student, Division of Applied Life Science, Graduate School of Gyeongsang National University)
• 황희성(경상국립대학교 작물생산과학부 대학원생) | Hee Sung Hwang (Graduate Student, Division of Crop Science, Graduate School of Gyeongsang National University)
• 정현우(경상국립대학교 응용생명과학부 대학원생) | Hyeon Woo Jeong (Graduate Student, Division of Applied Life Science, Graduate School of Gyeongsang National University)
• 황소영(경상국립대학교 응용생명과학부 대학원생) | So Yeong Hwang (Graduate Student, Division of Applied Life Science, Graduate School of Gyeongsang National University)
• 유진(경상국립대학교 응용생명과학부 대학원생) | Jin Yu (Graduate Student, Division of Applied Life Science, Graduate School of Gyeongsang National University)
• 황승재(경상국립대학교 농업생명과학대학 농업식물과학과 교수, 경상국립대학교 농업생명과학연구원 교수, 경상국립대학교 생명과학연구원 교수) | Seung Jae Hwang (Professor, Department of Agricultural Plant Science, College of Agriculture & Life Sciences, Gyeongsang National University, Professor, Institute of Agriculture & Life Sciences, Gyeongsang National University, Professor, Research Institute of Life Science, Gyeongsang National University) Corresponding Author