| Submergence tolerance conferred by Sub1A is mediated by SLR1 and SLRL1 restriction of gibberellin responses in rice. | |
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MedLine Citation:
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PMID: 18936491 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Submergence-tolerant rice maintains viability during complete submergence by limiting underwater elongation until floodwaters recede. Acclimation responses to submergence are coordinated by the submergence-inducible Sub1A, which encodes an ethylene-responsive factor-type transcription factor (ERF). Sub1A is limited to tolerant genotypes and sufficient to confer submergence tolerance to intolerant accessions. Here we evaluated the role of Sub1A in the integration of ethylene, abscisic acid (ABA), and gibberellin (GA) signaling during submergence. The submergence-stimulated decrease in ABA content was Sub1A-independent, whereas GA-mediated underwater elongation was significantly restricted by Sub1A. Transgenics that ectopically express Sub1A displayed classical GA-insensitive phenotypes, leading to the hypothesis that Sub1A limits the response to GA. Notably Sub1A increased the accumulation of the GA signaling repressors Slender Rice-1 (SLR1) and SLR1 Like-1 (SLRL1) and concomitantly diminished GA-inducible gene expression under submerged conditions. In the Sub1A overexpression line, SLR1 protein levels declined under prolonged submergence but were accompanied by an increase in accumulation of SLRL1, which lacks the DELLA domain. In the presence of Sub1A, the increase in these GA signaling repressors and decrease in GA responsiveness were stimulated by ethylene, which promotes Sub1A expression. Conversely, ethylene promoted GA responsiveness and shoot elongation in submergence-intolerant lines. Together, these results demonstrate that Sub1A limits ethylene-promoted GA responsiveness during submergence by augmenting accumulation of the GA signaling repressors SLR1 and SLRL1. |
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Authors:
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Takeshi Fukao; Julia Bailey-Serres |
Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S. Date: 2008-10-20 |
Journal Detail:
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Title: Proceedings of the National Academy of Sciences of the United States of America Volume: 105 ISSN: 1091-6490 ISO Abbreviation: Proc. Natl. Acad. Sci. U.S.A. Publication Date: 2008 Oct |
Date Detail:
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Created Date: 2008-10-29 Completed Date: 2008-12-01 Revised Date: 2010-09-22 |
Medline Journal Info:
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Nlm Unique ID: 7505876 Medline TA: Proc Natl Acad Sci U S A Country: United States |
Other Details:
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Languages: eng Pagination: 16814-9 Citation Subset: IM |
Affiliation:
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Department of Botany and Plant Sciences, Center for Plant Cell Biology, University of California, Riverside, CA 92521, USA. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Abscisic Acid Acclimatization* Ethylenes Gene Expression Regulation, Plant Gibberellins / physiology* Intracellular Signaling Peptides and Proteins / physiology* Nuclear Proteins / physiology* Oryza sativa / physiology* Plant Growth Regulators / physiology* Plant Physiological Phenomena Plant Proteins / physiology* Signal Transduction* Transcription Factors / physiology* Water |
| Chemical | |
Reg. No./Substance:
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0/Ethylenes; 0/Gibberellins; 0/Intracellular Signaling Peptides and Proteins; 0/Nuclear Proteins; 0/Plant Growth Regulators; 0/Plant Proteins; 0/Transcription Factors; 21293-29-8/Abscisic Acid; 74-85-1/ethylene; 7732-18-5/Water |
| Comments/Corrections | |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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