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Effects of monochromatic LED light quality on endogenous hormone content in leaves and hypocotyl of Cucumis sativus L.(PDF)

Chinese Journal of Applied & Environmental Biology[ISSN:1006-687X/CN:51-1482/Q]

2014 01
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Effects of monochromatic LED light quality on endogenous hormone content in leaves and hypocotyl of Cucumis sativus L.
SU Nana WU Qi CUI Jin
College of Life Sciences, Nanjing Agricultural University, Nanjing 210095, China
LED light quality cucumber seedling GA3 IAA ABA endogenous hormone

To investigate the effect of monochromatic LED light quality on endogenous hormone content in leaves and hypocotyl of cucumber seedlings, the endogenous GA3, IAA and ABA in seedling leaves and hypocotyl under red, blue, yellow and green lights were determined by High Performance Liquid Chromatograph (HPLC). The light-emitting diodes (LEDs) were used as optical source and cucumber seedlings as experimental material. The experimental results showed that light qualities influenced the photomorphogenesis of cucumber seedlings by regulating the distribution of endogenous hormone. Red light increased polar IAA transport to hypocotyl with the content of IAA in leaves being 20 ?g g-1 but 120 ?g g-1 in hypocotyls. Contrarily, blue light promoted the accumulation of massive IAA in leaves to inhibit the euphylla growth. Yellow light curled the leaves, and at the same time, failed in de-etiolating and increasing the GA3 concentration in leaves ( about twice as much as control). The hypocolyls under all monochromatic lights were longer than that of the control treatment, suggesting that every monochromatic light had its function on repressing hypocotyl extension. Yellow light and green light enlongated the hypocotyl dramaticlly due to high GA3 concentration and low ABA concentration in hypocotyl. Red light did not significantly elongate the hypocotyl due to high GA3 and ABA concentrations. In conclusion, light quality significantly affected the content of endogenous hormone of cucumber seedlings, and then induced changes of morphological characteristics of seedlings. These results may lay a theoretical foundation for setting reasonable light conditions for cultivated seedlings.


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Last Update: 2014-03-06