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Physiological function of PIF3 in the phytochrome-mediated light

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  • 2014-01-17

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Physiological function of PIF3 in the phytochrome-mediated light


signal transduction


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- Date/Time : Thu June 5., 2003


             16:00-17:00 






- Speaker : 최길주 박사


          - 한국과학기술원


    



- Place : Life Science Bldg. #104






- For inquires : Professor Ildoo Hwang Dept. of Life Science


                생명과학과 황일두 교수 (☎279-2291)



 



Abstract -


   Phytochromes regulate various light responses through their interacting proteins. PIF3 is one of such interacting proteins. The physiological function of PIF3 in light signaling, however, is not clear. To determine the physiological role of PIF3, we characterized a T-DNA inserted pif3 mutant and transgenic plants expressing the full length PIF3. Contrary to the previous report, we found that phenotypes of a transgenic lines displayed longer hypocotyl under red light and reduced cotyledon opening both under red and far-red light, while the pif3 mutant showed the opposite phenotypes. The expression patterns of two light inducible genes further indicated complicated features of PIF3 function. The expression of CHS was increased in the overexpression line and decreased in the mutant both under red and far-red. Unlike CHS, however, the expression of CAB was decreased in the overexpression line and increased in the mutant. Our data indicate that PIF3 is not a simple positive or negative regulator of PHY-mediated light signaling, rather, it plays complicated roles depending on different light responses and different light conditions.




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