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http://dx.doi.org/10.5352/JLS.2012.22.5.681

Effect of Light on Root Growth and Gravitropic Response of Phytochrome Mutants of Arabidopsis  

Park, Ji-Hye (Department of Biological Sciences, Andong National University)
Lee, Sang-Seoung (Department of Biological Sciences, Andong National University)
Woo, Soon-Hwa (Department of Biological Sciences, Andong National University)
Kim, Soon-Young (Department of Biological Sciences, Andong National University)
Publication Information
Journal of Life Science / v.22, no.5, 2012 , pp. 681-686 More about this Journal
Abstract
Light, one of the environmental stimuli, is fundamental to the growth and development of plants. Red and far-red light are sensed using the phytochrome family of plant photoreceptors. To investigate the effect of light on root growth and gravitropism, we used the Arabidopsis phytochrome mutants grown in several light conditions. The root growth of $phyA$ reared in all light conditions except white light and was stimulated compared to the WT. The stimulation of root growth was obvious in $phyA$ grown in red light. On the other hand, the root growth of $phyB$ grown in all light conditions decreased, and the lowest rate of decrease was observed in $phyAB$ grown in white and red light. The gravitropic response of $phyA$ was stimulated compared to the WT when it was grown in all light conditions except far-red light. $PhyAB$ grown in all light conditions showed the inhibition of gravitropic response. The transcript level of ACS, one of the enzymes regulating ethylene biosynthesis, increased in $phyA$ grown in white and red light, but not in $phyA$ grown in far-red light. In conclusion, these results suggested that the $P_{fr}$ form of $phyB$ regulates the root growth and gravitropism.
Keywords
Root growth; gravitropic response; phytochrome; ethylene biosynthesis;
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Times Cited By KSCI : 1  (Citation Analysis)
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