| SCAR Mediates Light-Induced Root Elongation in Arabidopsis through Photoreceptors and Proteasomes. | |
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MedLine Citation:
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PMID: 21972261 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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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 wild-type 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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Authors:
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Julia Dyachok; Ling Zhu; Fuqi Liao; Ji He; Enamul Huq; Elison B Blancaflor |
Publication Detail:
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Type: JOURNAL ARTICLE Date: 2011-10-4 |
Journal Detail:
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Title: The Plant cell Volume: - ISSN: 1532-298X ISO Abbreviation: - Publication Date: 2011 Oct |
Date Detail:
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Created Date: 2011-10-5 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 9208688 Medline TA: Plant Cell Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Affiliation:
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Plant Biology Division, The Samuel Roberts Noble Foundation, Ardmore, Oklahoma 73401. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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