Effects of Artificial Light Sources for Night Break on Floral Induction and Growth in Perilla ocymoides L.
2008
Choi, Y.W. (Pusan National University, Miryang, Republic of Korea) | Son, B.G. (Pusan National University, Miryang, Republic of Korea) | Kang, J.S. (Pusan National University, Miryang, Republic of Korea) | Lee, Y.J. (Pusan National University, Miryang, Republic of Korea) | Park, H.C. (Pusan National University, Miryang, Republic of Korea) | Kim, K.K. (Pusan National University, Miryang, Republic of Korea) | Kim, Y.C. (Pusan National University, Miryang, Republic of Korea) | Choi, I.S. (Pusan National University, Miryang, Republic of Korea) | Lee, Y.J. (Pusan National University, Miryang, Republic of Korea) | Shin, W.J. (Pusan National University, Miryang, Republic of Korea) | Park, Y.H. (Pusan National University, Miryang, Republic of Korea), E-mail: [email protected]
The influences of night break by costly artificial light sources were investigated on the photo-morphogenesis and growth of leafy perilla (Perilla ocymoides L.). The irradiation of red, blue, and three-colored light for night break significantly increased the stem length and stem diameter compared to dark. Three-colored light gave the highest fresh and dry weight of stem, followed by red and blue light. Floral induction was suppressed up to 100 days after the night break, by red and three-colored light, but the plants grown under the dark or treated with blue light showed 85% and 31% flowering rate, respectively. The time needed for floral induction after night break was 60 days in dark and 80 days in blue light. The number of leaf, leaf area, and fresh weight per plant were the highest in red and three-colored light night break, followed by blue light and dark. The photosynthetic rate observed 80 days after night break was the highest in red light, followed by blue and three-colored light. A low light compensation point of 20 μmol m-²ㆍs-¹ was observed in three-colored light, while red and blue light tended to show higher measurements.
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