EFFECTS OF CONTINUOUS IRRADIATION OF LED LIGHT ON GROWTH OF YOUNG TEA PLANTS
Tea plants (Camellia sinensis L.) have various functions for increasing our QOL by taking them in our daily lives. In order to utilize tea plants as an indoor plant, it is necessary to know how their growth and functions are controlled by environmental conditions. The present study focused on light condition because it is quite different between indoor and outdoor conditions. The effects of continuous irradiation of LED light as an artificial light source on growth of young tea plants (Yabukita species) were investigated. LED light at each wavelength (blue (peak wavelength: 465 nm), green (502 nm), yellow (592 nm) or red (660 nm)) was continuously irradiated against 1) 1-year-old hydroponically-cultivated rooted cuttings for 1 month, 2) cuttings for 3 months, and 3) potted rooted cuttings after 3 months cultivation for 2 months. Red and green LED-irradiated rooted cuttings showed good growth on shoots. About the growth of roots, rooted cuttings irradiated with red LED light had the longest total root length with high percentage of fine roots (size: less than 0.5 mm in diameter). On the other hand, blue LED-irradiated rooted cuttings showed a high rate of thick root (size: 0.5
-2 s-1. To compare effects of wavelength of LED light on the growth of tea plants, experimental conditions about light (intensity and irradiation method) and reaction manners of tea plants in each period should be considered throughout a year.
Homma, T., Anzai, T., Matsuo, K., Kanemitsu, N., Satoh, H. and Hiramoto, H. (2011). EFFECTS OF CONTINUOUS IRRADIATION OF LED LIGHT ON GROWTH OF YOUNG TEA PLANTS. Acta Hortic. 907, 233-236
Camellia sinensis L., rooted cuttings, root length, wavelength