The early time course of the inhibition of stem growth of etiolated pea seedlings by fluorescent light |
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Authors: | F J Behringer P J Davies |
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Institution: | (1) Section of Plant Biology, Cornell University, 14853 Ithaca, NY, USA;(2) Present address: Department of Biology, Pennsylvania State University, 16802 University Park, PA, USA |
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Abstract: | The stem elongation responses of etiolated peas (Pisum sativum L.) to fluorescent light (35–45 mol.mt-2.s-1) were recorded using high resolution position transducers. Continuous fluorescent light decreased growth by 70% within 9 min. The growth rate declined to 5% of the control over the next 2 h and remained at this level for 7 h. Pulses of fluorescent light ranging from 8 s to 34 min led to partial suppression of growth and resulted in a complex kinetic response. The distinctive kinetics of blue and red light inhibition were apparent as components of the responses to non-saturating levels of fluorescent light. The rapid suppression of growth by blue light was not affected by concomitant red light. The lag time for the onset of red light inhibition was not affected by concomitant blue, but the rate of inhibition appeared accelerated. |
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Keywords: | blue light fluorescent light Pisum photomorphogenesis red light stem elongation |
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