This study was conducted to investigate the growth characteristics of cucumber (Cucumis sativus L. ‘Joeunbaekdadagi’) and tomato (Solanum lycopersicum L. ‘Dotaerang Dia’) seedlings by light intensities and CO2 concentrations in a closed-type plant production system (CPPS). Cucumber and tomato seeds were sown in 50-cell trays and germinated in CPPS at air temperature 25 ± 1°C and relative humidity 50 ± 10% for 4 days. After germination, the CO2 concentrations and light intensity treatment were treated at 500 (ambient), 1,000, and 1,500 μmol·mol-1 and 100, 200, and 300 μmol·m-2·s-1 photosynthetic photon flux density (PPFD), respectively. The leaf area of cucumber showed the highest value in CO2 1,500 μmol·mol-1. However, the leaf area of the tomato had no significant difference in CO2 concentrations and light intensities treatments. In cucumber and tomato both seedlings, the growth and quality such as compactness and leaf area rate were increased with the increase of light intensity, and there were highest in 300 μmol·m-2·s-1. The root surface and number of root tips of cucumber and tomato seedlings were significantly increased with the increase in light intensity. In conclusion, the regulation of the CO2 concentrations and light intensity can control the growth and quality of cucumber and tomato seedlings in CPPS, especially, increasing the light intensity can improve more significantly the growth and quality of seedlings.

서 론
재료 및 방법
    1. 실험재료 및 재배환경
    2. 생육 조사
    3. 실험설계 및 통계분석
결과 및 고찰
    1. 지상부 생육
    2. 지하부 생육
    3. 묘소질
사 사
적 요

• 윤지혜(경상국립대학교 대학원 응용생명과학부 대학원생) | Ji Hye Yun (Graduate Student, Division of Applied Life Science, Graduate School of Gyeongsang National University, Jinju 52828, Korea)
• 정현우(경상국립대학교 대학원 응용생명과학부 대학원생) | Hyeon Woo Jeong (Graduate Student, Division of Applied Life Science, Graduate School of Gyeongsang National University, Jinju 52828, Korea)
• 황소영(경상국립대학교 대학원 응용생명과학부 대학원생) | So Yeong Hwang (Graduate Student, Division of Applied Life Science, Graduate School of Gyeongsang National University, Jinju 52828, Korea)
• 유진(경상국립대학교 대학원 응용생명과학부 대학원생) | Jin Yu (Graduate Student, Division of Applied Life Science, Graduate School of Gyeongsang National University, Jinju 52828, Korea)
• 황희성(경상국립대학교 대학원 작물생산과학부 대학원생, 경상국립대학교 농업생명과학연구원 연구원) | Hee Sung Hwang (Graduate Student, Division of Crop Science, Graduate School of Gyeongsang National University, Jinju 52828, Korea, Graduate Researcher, Institute of Agriculture & Life Sciences, Gyeongsang National University, Jinju 52828, Korea)
• 황승재(경상국립대학교 농업생명과학대학 원예과학부 교수, 경상국립대학교 농업생명과학연구원 교수, 경상국립대학교 생명과학연구원 교수) | Seung Jae Hwang (Professor, Division of Horticultural Science, College of Agriculture & Life Science, Gyeongsang National University, Jinju 52828, Korea, Professor, Institute of Agriculture & Life Sciences, Gyeongsang National University, Jinju 52828, Korea, Professor, Research Institute of Life Science, Gyeongsang National University, Jinju 52828, Korea) Corresponding Author