ISHS Acta Horticulturae 907: VI International Symposium on Light in Horticulture
EFFECTS OF LED LIGHT QUALITY R/B TO GROWTH OF SWEET POTATO PLANTLETS IN VITRO AND ENERGY CONSUMPTIONS OF LIGHTING |
| Authors: | Y.T. Yang, P. Xiao, Q.C. Yang |
| Keywords: | energy consumption, LED, R/B, sweet potato, tissue culture |
| DOI: | 10.17660/ActaHortic.2011.907.68 |
| Abstract:
A LED lighting tube for tissue culture was developed by using red LED (660±20 nm) and blue LED (450±20 nm). Effect of R/B on the growth of sweet potato plantlets in vitro and the energy consumption within different R/B were studied. The R/B means spectral quality ratio and it was defined as the ratio of the PPF of red (R) LED to the PPF of blue (B) LED. The sweet potato plantlets in vitro were grown for 28 days with LEDs in 4 different R/B and with normal fluorescent lamps as check. The R/B was set at 4, 6, 8 and 10 and the total PPF was set at 35 µmol•m-2•s-1. The results showed that: higher R/B increased the height, enhanced the overground fresh and dry weight, lowered the overground water ratio, and promoted the accumulation of dry materials. 8 is the best R/B for the underground fresh weight and root shoot ratio. The chlorophyll and the carotenoid contents did not show difference between different R/B. The overground fresh weight, water ratio and height of plantlets under fluorescent lamps were largest, but the root shoot ratio was lowest. The energy consumption of LED tubes was linear with the R/B, and was 33% of fluorescent lamps. | |
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