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