Journal
PLANT CELL
Volume 23, Issue 10, Pages 3610-3626Publisher
AMER SOC PLANT BIOLOGISTS
DOI: 10.1105/tpc.111.088823
Keywords
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Funding
- Samuel Roberts Noble Foundation
- Oklahoma Center for the Advancement of Science and Technology [OCAST PSB10-004]
- National Science Foundation [IOS-0822811, IOS-0849287, DBI-0722635, DBI-0400580]
- Direct For Biological Sciences
- Division Of Integrative Organismal Systems [0849287] Funding Source: National Science Foundation
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The ARP2/3 complex, a highly conserved nucleator of F-actin, and its activator, the SCAR complex, are essential for growth in plants and animals. In this article, we present a pathway through which roots of Arabidopsis thaliana directly perceive light to promote their elongation. The ARP2/3-SCAR complex and the maintenance of longitudinally aligned F-actin arrays are crucial components of this pathway. The involvement of the ARP2/3-SCAR complex in light-regulated root growth is supported by our finding that mutants of the SCAR complex subunit BRK1/HSPC300, or other individual subunits of the ARP2/3-SCAR complex, showed a dramatic inhibition of root elongation in the light, which mirrored reduced growth of wildtype roots in the dark. SCAR1 degradation in dark-grown wild-type roots by constitutive photomorphogenic 1 (COP1) E3 ligase and 26S proteasome accompanied the loss of longitudinal F-actin and reduced root growth. Light perceived by the root photoreceptors, cryptochrome and phytochrome, suppressed COP1-mediated SCAR1 degradation. Taken together, our data provide a biochemical explanation for light-induced promotion of root elongation by the ARP2/3-SCAR complex.
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