Department of Horticulture, Kongju National University, Yesan, Korea
Institute of Agriculture and Life Science, Gyeongsang National University, Jinju, Korea
Corresponding authors: Prof. Hyo Gil Choi, Department of Horticulture, Kongju National University, 54, Deahak-ro, Yesan, South Chungcheong Province 32439, Republic of Korea. Tel.: +82 41 330 1221; Fax: +82 41 330 1229; E-mail: [email protected] and Prof. Nam Jun Kang, Institute of Agriculture and Life Science, Gyeongsang National University, 501, Jinju-daero, Jinju, South Gyeongsang Province 52828, Republic of Korea. Tel.: +82 55 772 0269; Fax: +82 55 772 0272; E-mail: [email protected].
Abstract: BACKGROUND:The use of two-floor bench bed systems to improve the strawberry productivity in Korea is increasing. OBJECTIVE:This study aimed to investigate the effect of different combinations of light intensity and carbon dioxide (CO2) concentration on photosynthesis, chlorophyll fluorescence, and fruit yield in strawberry (Fragaria × ananassa). METHODS:A two-floor bench bed system was used for light intensity treatments. CO2 fertilizer was supplied, from December 5 to January 30, when the concentration in a greenhouse fell below 700μmolmol–1, while the control received only ambient CO2. RESULTS:Strawberry plants that were grown under high light intensity in the upper bed had a higher photosynthesis rate than plants grown under low light intensity in the bottom bed; however, light intensity had a negligible effect on the stomatal conductance (Sc) and transpiration rate (Tr) of strawberry leaves. In contrast, CO2 fertilization lowered Sc and Tr values in strawberry leaves. Plants grown under low light intensity without CO2 fertilization had the highest chlorophyll fluorescence decrease ratio. Fruit yield was highest in plants grown under high light intensity, with CO2 fertilization having relatively little effect; however, CO2 fertilization stimulated the accumulation of anthocyanins. CONCLUSIONS:CO2 fertilization is effective in a two-floor bench bed system.