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Phytochrome Modulation of Blue Light-Induced Chloroplast Movements in Arabidopsis

Stacy L. DeBlasio, Jack L. Mullen, Darron R. Luesse and Roger P. Hangarter
Plant Physiology
Vol. 133, No. 4 (Dec., 2003), pp. 1471-1479
Stable URL: http://www.jstor.org/stable/4281465
Page Count: 9
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Phytochrome Modulation of Blue Light-Induced Chloroplast Movements in Arabidopsis
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Abstract

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.

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