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Phytochrome Modulation of Blue Light-Induced Chloroplast Movements in Arabidopsis¹

Department of Biology, Indiana University, Bloomington, Indiana 47405

Photometric analysis of chloroplast movements in various phytochrome (phy) mutants of Arabidopsis showed that phyA, B, and D are not required for chloroplast movements because blue light (BL)-dependent chloroplast migration still occurs in these mutants. However, mutants lacking phyA or phyB showed an enhanced response at fluence rates of BL above 10 µmol m^-2 s^-1. Overexpression of phyA or phyB resulted in an enhancement of the low-light response. Analysis of chloroplast movements within the range of BL intensities in which the transition between the low- and high-light responses occur (1.5-15 µmol m^-2 s^-1) revealed a transient increase in light transmittance through leaves, indicative of the high-light response, followed by a decrease in transmittance to a value below that measured before the BL treatment, indicative of the low-light response. A biphasic response was not observed for phyABD leaves exposed to the same fluence rate of BL, suggesting that phys play a role in modulating the transition between the low- and high-light chloroplast movement responses of Arabidopsis.

¹ This work was supported by the National Science Foundation (grant no. IBN-0080783) and by the U.S. Department of Agriculture (National Needs Fellowship no. 98-38420-584).

^* Corresponding author; e-mail rhangart{at}bio.indiana.edu; fax 812-855-6082.

Received June 24, 2003; returned for revision August 1, 2003; accepted September 18, 2003.

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