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Published on October 19, 2007; 10.1104/pp.107.107227

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Received August 10, 2007
Accepted October 8, 2007

The F-box Protein MAX2 Functions as a Positive Regulator of Photomorphogenesis in Arabidopsis

Hui Shen , Phi Luong , and Enamul Huq *

Section of Molecular Cell and Developmental Biology and The Institute for Cellular and Molecular Biology, The University of Texas at Austin, Austin, TX 78712, USA

* Corresponding author; email: huq{at}mail.utexas.edu.

Light is vital for plant growth and development. To respond to ambient light signals, plants are equipped with an array of photoreceptors including, phytochromes (phys) that sense red (R)/far-red (FR) regions, and cryptochromes (crys) and phototropins (phots) that respond to UV-A/blue (B) region of the light spectrum, respectively. Several positively and negatively acting components in light-signaling pathways have been identified using genetic approaches; however, the pathways are not saturated. Here we characterize a new mutant named pleiotropic photosignaling, pps, isolated from a genetic screen under continuous R light. pps has longer hypocotyls and slightly smaller cotyledons under continuous R, FR and B light compared to that of the wild type. pps is also hyposensitive to both R and FR light induced seed germination. Although photosynthetic marker genes are constitutively expressed in pps in the dark at high levels, the expression of early light-regulated genes is reduced in the pps seedlings compared to wild type seedlings under R light. PPS encodes MAX2/ORE9, an F box protein involved in inflorescence architecture and senescence. MAX2 is expressed ubiquitously in seedling stage. However, its expression is restricted to vascular tissues and meristems at the adult stages. MAX2 is also localized to the nucleus. As an F-box protein, MAX2 is predicted to be a component of SCF complex involved in regulated proteolysis. These results suggest that SCFMAX2 plays critical roles in R, FR and B light signaling pathways. In addition, MAX2 might regulate multiple targets at different developmental stages to optimize plant growth and development.




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H. Shen, L. Zhu, A. Castillon, M. Majee, B. Downie, and E. Huq
Light-Induced Phosphorylation and Degradation of the Negative Regulator PHYTOCHROME-INTERACTING FACTOR1 from Arabidopsis Depend upon Its Direct Physical Interactions with Photoactivated Phytochromes
PLANT CELL, June 1, 2008; 20(6): 1586 - 1602.
[Abstract] [Full Text] [PDF]


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