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Effects of light generated by red and blue light-emitting diodes on the photomixo- trophic growth of Zantedeschia jucunda 'Black Magic' plantlets in vitro and tuber formation after transplant under the same PPF and photoperiod were investigated. All fi ve treatments had the same photosynthetic photon fl ux (PPF, 80 ± 5 µmol·m -2 ·s -1 ) and photoperiod (16 hours daytime/8 hours nighttime), leading to the same daily light integral. Results showed that the tubular fl uorescent lamp (TFL) treatment had the highest value on chlorophyll content and dry weight accumulation than other treatments using light-emitting diodes (LEDs). In LED treatments, there were no signifi cant differences on dry weight and growth rate but with signifi cant differences on chlorophyll content and plant height when blue light LEDs were added. It revealed that blue light was involved in plant height and chlorophyll development control mechanism. Results also showed that minor difference in 28 days of transplant production (in vitro) among treatments does not extends after 6 months of tuber formation stage grown in greenhouse. At present, blue LEDs cost much more than that of red LEDs, results of this study suggested that using red LEDs alone and powered with AC is feasible for the commercial production of Zantedeschia plantlets in vitro. Light-emitting diodes (LEDs) are a potential alternative to tubular fl uorescent lamps (TFLs) due to their low forward current, small in size, wavelength specifi c, solid-state construction, low degradation and long life (Brown et al., 1995; Bula et al., 1991; Fang and Jao, 2000). A light source for young plants production using blue (B) and red (R) LEDs was developed with the capabilities of altering blue and/or red light intensity, R to B ratio, frequency and duty ratio of light (Jao and Fang, 2003). Using such a device, authors found that continuous light from LEDs and TFLs had no signifi cant difference to the growth of potato (Solanum tuberosum L. 'Ken- nebec') plantlets in vitro. However, intermittent or pulse light promotes the growth of potato plantlets signifi cantly (Jao and Fang, 2004a). Concurrent red and blue light enhances growth of potato plantlets compare with alternating red and blue light under the same daily light integral (5.53 mol·m -2

Effects of Red light on the Growth of Zantedeschia Plantlets in vitro and Tuber Formation Using Light-emitting Diodes