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Overexpression of Arabidopsis Phytochrome B Inhibits Phytochrome A Function in the Presence of Sucrose1

Timothy W. Short*

Biology Department, Queens College and the Graduate School of The City University of New York, Flushing, New York 11367

Overexpression of phytochrome B (phyB) in Arabidopsis has previously been demonstrated to result in dominant negative interference of phytochrome A (phyA)-mediated hypocotyl growth inhibition in far-red (FR) light. This phenomenon has been examined further in this study and has been found to be dependent on the FR fluence rate and on the availability of metabolizable sugars in the growth medium. Poorly metabolized sugars capable of activating the putative hexokinase sensory function were not effective in eliciting the phytochrome interference response. Overexpressed phyB lacking the chromophore-binding site was also effective at inhibiting the phyA response, especially at higher fluence rates of FR. Overexpressed phyB produces the dominant negative phenotype without any apparent effect on phyA abundance or degradation. It is possible that phyA and phyB interact with a common reaction partner but that either the energy state of the cell or a separate sugar-signaling mechanism modulates the phytochrome-signaling interactions.

1   This work was supported in part by the National Science Foundation (grant nos. IBN 9421770 and IBN 9734527) and by grants from The City University of New York Professional Staff Congress-City University of New York Research Award Program.
*   E-mail timothy_short{at}qc.edu; fax 1-718-997-3445.

Plant Physiol. (1999) 119: 1497-1506
Copyright Clearance Center:   0032-0889/99/119//10
© 1999 American Society of Plant Physiologists




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