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Plant and Cell Physiology 2004 45(12):1798-1808; doi:10.1093/pcp/pch205
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© 2004 Oxford University Press

Cryptochromes and Phytochromes Synergistically Regulate Arabidopsis Root Greening under Blue Light

Takeshi Usami1, Nobuyoshi Mochizuki1, Maki Kondo2, Mikio Nishimura2 and Akira Nagatani1,3

1 Department of Botany, Graduate School of Science, Kyoto University, Sakyo-Ku, Kyoto, 606-8502 Japan
2 Department of Cell Biology, National Institute for Basic Biology, Okazaki, Aichi, 444-8585 Japan

To increase their fitness, plants sense ambient light conditions and modulate their developmental processes by utilizing multiple photoreceptors such as phytochrome, cryptochrome and phototropin. Even roots, which are normally not exposed to light, express photoreceptors and can respond to light by developing chloroplasts. In the present study, root greening was observed in Arabidopsis thaliana. Seedlings were grown under monochromatic light and chlorophyll levels in the roots were determined. It was found that blue light was far more effective at inducing chloroplast development in Arabidopsis roots than was red light, and this response was under the control of a strong synergistic interaction between phytochromes and cryptochromes. As expected, the cry1 mutant was deficient in this response. Interestingly, the phyAphyB double mutant failed to respond to blue light under these conditions. This strongly suggests that either phytochrome A or phytochrome B, in addition to cryptochrome, was required for this blue light response. It was further demonstrated that the expression of photosynthetic genes was regulated in the same way. Dichromatic irradiation experiments indicated that this interaction depends on the level of phyB PFR. Analysis of the cop1, det1 and hy5 mutants indicated that the corresponding factors were involved in the response.

3 Corresponding author: E-mail, nagatani{at}physiol.bot.kyoto-u.ac.jp; Fax, +81-75-753-4126.


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