Takashi Norimoto, Kiyohisa Kawakami and Akemi Mizutani Effects of light quality on the growth of tissue cultured transplants

摘要

Tissue cultured transplants cultivated under two LEDs with different light quality and conventional fluorescent lamp as artificial light sources, were examined and compared the growth of plantlets. Culture conditions were 23±1°C, 16 hours illumination / 8 hours dark, PPFD at illumination was 100 umol m "2 s for all light sources. The light sources used for this examination were a cool white fluorescent lamp (FL) and two types of straight-tube type LEDs, Tecoled G2 (cool white: G2) and Tecoled G4 (warm white: G4). In strawberry, 'Akihime', there was no significant difference in total fresh weight (FW) and leafnumber per plantlet under the three different light sources. However, for 'Tochiotome' and 'Toyonoka', the total FW and leaf number were larger under G4. Compared with FL, the petiole length tends to be shorter in both of LEDs. In sweet potato, total FWper plantlet was greater under G4 in 'Narutokintoki' and 'Beniharuka1 and under G2 in 'Beniazuma'. The differences in response to the different light sources were relatively great depending on the cultivars in sweet potato. In Japanese horseradish, the value of all measured parameters was the maximum under G2, and the overall growth was also the most vigorous under G2.