TY - JOUR
T1 - Effect of end-of-day far-red light from a movable LED fixture on squash rootstock hypocotyl elongation
AU - Yang, Zhen Chao
AU - Kubota, Chieri
AU - Chia, Po Lung
AU - Kacira, Murat
N1 - Funding Information: Authors would like to thank Mark Kroggel and David Story for providing technical support as well as statistical analyses. We are grateful to ORBITEC (Madison, WI) and CCS Inc. (Kyoto, Japan) for providing LED lighting systems. This research was partially funded by USDA Specialty Crop Research Initiative (Award Number 2010-51181-21369).
PY - 2012/3/1
Y1 - 2012/3/1
N2 - Effects of end-of-day far-red (EOD-FR) light on hypocotyl elongation of a commercial cucurbit rootstock were investigated using movable and stationary light fixtures, since adequate hypocotyl length is required in vegetable grafting. Seedlings of an interspecific squash 'Tetsukabuto' (Cucurbita maxima x Cucurbita moschata) were grown in greenhouse and subject to daily EOD-FR light treatments with various application methods. The response of seedling hypocotyl length was well described using a Michaelis-Menten-type saturation curve over the range of 0-8.8mmolm -2d -1 FR light doses, as we previously reported for tomato rootstocks. Using a near saturating dose of 4.0mmolm -2d -1 FR light, efficacy of a movable FR light fixture for EOD-FR light treatment was compared with that of a stationary FR light fixture. The movable light fixture was a 120-cm metal bar equipped with FR light emitting diodes (LEDs) and the application was tested at two different traveling speeds (0.78 and 3.13mms -1) with one and four repeated applications per day, respectively, to reach the same target FR light dose (4.0mmolm -2d -1). Regardless of traveling speed, the extent of hypocotyl elongation under the moving FR LED fixture was statistically the same as that under stationary LED fixture and was 55-69% greater than non-treated control, suggesting that EOD-FR light applications can be designed flexibly. As far as we are aware, this is the first paper demonstrating the effect of EOD light quality treatment using moving light fixtures.
AB - Effects of end-of-day far-red (EOD-FR) light on hypocotyl elongation of a commercial cucurbit rootstock were investigated using movable and stationary light fixtures, since adequate hypocotyl length is required in vegetable grafting. Seedlings of an interspecific squash 'Tetsukabuto' (Cucurbita maxima x Cucurbita moschata) were grown in greenhouse and subject to daily EOD-FR light treatments with various application methods. The response of seedling hypocotyl length was well described using a Michaelis-Menten-type saturation curve over the range of 0-8.8mmolm -2d -1 FR light doses, as we previously reported for tomato rootstocks. Using a near saturating dose of 4.0mmolm -2d -1 FR light, efficacy of a movable FR light fixture for EOD-FR light treatment was compared with that of a stationary FR light fixture. The movable light fixture was a 120-cm metal bar equipped with FR light emitting diodes (LEDs) and the application was tested at two different traveling speeds (0.78 and 3.13mms -1) with one and four repeated applications per day, respectively, to reach the same target FR light dose (4.0mmolm -2d -1). Regardless of traveling speed, the extent of hypocotyl elongation under the moving FR LED fixture was statistically the same as that under stationary LED fixture and was 55-69% greater than non-treated control, suggesting that EOD-FR light applications can be designed flexibly. As far as we are aware, this is the first paper demonstrating the effect of EOD light quality treatment using moving light fixtures.
KW - Controlled environment
KW - Dose response
KW - Grafting
KW - Interspecific squash
KW - Phytochrome
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U2 - 10.1016/j.scienta.2011.12.023
DO - 10.1016/j.scienta.2011.12.023
M3 - Article
SN - 0304-4238
VL - 136
SP - 81
EP - 86
JO - Scientia Horticulturae
JF - Scientia Horticulturae
ER -