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Biliverdin reductase-induced phytochrome chromophore deficiency in transgenic tobacco

Montgomery, Beronda L., Franklin, Keara A., Terry, Matthew J., Thomas, Brian, Jackson, Stephen D., Crepeau, Marc W. and Lagarias, J. Clark (2001) Biliverdin reductase-induced phytochrome chromophore deficiency in transgenic tobacco Plant Physiology, 125, (1), pp. 266-277.

Record type: Article


Targeted expression of mammalian biliverdin IXalpha reductase (BVR), an enzyme that metabolically inactivates linear tetrapyrrole precursors of the phytochrome chromophore, was used to examine the physiological functions of phytochromes in the qualitative short-day tobacco (Nicotiana tabacum cv Maryland Mammoth) plant. Comparative phenotypic and photobiological analyses of plastid- and cytosol-targeted BVR lines showed that multiple phytochrome-regulated processes, such as hypocotyl and internode elongation, anthocyanin synthesis, and photoperiodic regulation of flowering, were altered in all lines examined. The phytochrome-mediated processes of carotenoid and chlorophyll accumulation were strongly impaired in plastid-targeted lines, but were relatively unaffected in cytosol-targeted lines. Under certain growth conditions, plastid-targeted BVR expression was found to nearly abolish the qualitative inhibition of flowering by long-day photoperiods. The distinct phenotypes of the plastid-targeted BVR lines implicate a regulatory role for bilins in plastid development or, alternatively, reflect the consequence of altered tetrapyrrole metabolism in plastids due to bilin depletion.

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Published date: January 2001


Local EPrints ID: 56154
ISSN: 0032-0889
PURE UUID: c92028f8-4df8-48a0-8088-a2f383a6a7af

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Date deposited: 07 Aug 2008
Last modified: 17 Jul 2017 14:31

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Author: Beronda L. Montgomery
Author: Keara A. Franklin
Author: Brian Thomas
Author: Stephen D. Jackson
Author: Marc W. Crepeau
Author: J. Clark Lagarias

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