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Effect of Long Term LED Lighting on the Photosynthesis, Structure of Mesophyll Tissue and Fruit Quality of ‘Fuji'/M.26 Apple Cultivar, Poster Board #311

Tuesday, July 31, 2012
Grand Ballroom
Seok-Beom Kang , Apple Research Station, National Institute of Horticultural and Herbal Science, Gunwi-Gun, Geyongbuk, South Korea
Yang-Yik Song , Apple Research Station, National Institute of Horticultural and Herbal Science, Gunwi-Gun, Geyongbuk, South Korea
Moo-Yong Park , Apple Research Station, National Institute of Horticultural and Herbal Science, Gunwi-Gun, Geyongbuk, South Korea
Hun-Joong Kweon , Apple Research Station, National Institute of Horticultural and Herbal Science, Gunwi-Gun, Geyongbuk, South Korea
Jinsu Lee , Horticultural Sciences Department, University of Florida, Gainesville, FL
This study was carried out to determine the effects of long term light-emitting diode (LED) lighting on the growth, structure of mesophyll tissue and photosynthesis of ten-year old 'Fuji'/M.26 apple. LED lighting was provided during the night after sunset for 20 weeks from June 10 to October, 2011. Experimental treatments consisted of the control, far-red LEDs (730 nm, 2 and 4 hours) and red LEDs (620 nm, 2 and 4 hours) using 20 LEDs/Printed Circuit Board/tree. Results showed that there was no difference among the treatments on the photosynthesis of the leaf at the July 12 growth stage. However, leaf photosynthesis under the far-red LED treatment was significantly higher than the other treatments at harvest stage on October 19. Also, the mesophyll tissues under the far-red LED lighting appeared loosened compared to the control at the October 12 stage. Regarding fruit quality, soluble solid and acid contents of fruits under the red and far-red LEDs (4 h exposure) were lower than the control.
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