Journal Of Applied Horticulture ISSN: 0972-1045


R. Scott Veitch, Rajasekaran R. Lada and Mason T MacDonald

Nova Scotia Agricultural College, Department of Environmental Science, P. O. Box 550, B2N5E3, Bible Hill, Nova Scotia, Canada.

Key words: Abscission, Abies balsamea, balsam fir, conifer, light emitting diode, needle retention, postharvest, senescence

Journal of Applied Horticulture, 2012, volume 14, issue 1, pages 13-17.

Abstract: Two experiments were conducted to understand the effect of light emitting diodes on postharvest abscission in balsam fir (Abies balsamea L.) branches. In one experiment, branches were pre-exposed to the fluorescent light, LEDs, or darkness for 1, 4, 8, 12, 24, or 48 h. In a second experiment, branches were constantly exposed to fluorescent lights, LEDs, or darkness. The response variable was needle retention duration (NRD). A 48-hour exposure time to red, white, or blue LEDs significantly (P < 0.001) increased NRD by approximately 75, 118, or 127%, respectively, compared to a cool white fluorescent lighting or darkness. Constant exposure to any LED significantly (P < 0.001) improved NRD compared to fluorescent lights or darkness, though white and red LEDs were most effective. It is speculated that LED-promoted needle retention could possibly be due to changes in carbohydrate synthesis similar to those observed during cold acclimation.

Effect of light emitting diodes (LEDs) on postharvest needle retention of balsam fir (Abies balsamea L.)

Journal of Applied Horticulture