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Mutations in a plastid-localized elongation factor G alter early stages of plastid development in Arabidopsis thaliana

BACKGROUND: Proper development of plastids in embryo and seedling tissues is critical for plant development. During germination, plastids develop to perform many critical functions that are necessary to establish the seedling for further growth. A growing body of work has demonstrated that component...

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Autores principales: Ruppel, Nicholas J, Hangarter, Roger P
Formato: Texto
Lenguaje:English
Publicado: BioMed Central 2007
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2041950/
https://www.ncbi.nlm.nih.gov/pubmed/17629920
http://dx.doi.org/10.1186/1471-2229-7-37
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author Ruppel, Nicholas J
Hangarter, Roger P
author_facet Ruppel, Nicholas J
Hangarter, Roger P
author_sort Ruppel, Nicholas J
collection PubMed
description BACKGROUND: Proper development of plastids in embryo and seedling tissues is critical for plant development. During germination, plastids develop to perform many critical functions that are necessary to establish the seedling for further growth. A growing body of work has demonstrated that components of the plastid transcription and translation machinery must be present and functional to establish the organelle upon germination. RESULTS: We have identified Arabidopsis thaliana mutants in a gene that encodes a plastid-targeted elongation factor G (SCO1) that is essential for plastid development during embryogenesis since two T-DNA insertion mutations in the coding sequence (sco1-2 and sco1-3) result in an embryo-lethal phenotype. In addition, a point mutation allele (sco1-1) and an allele with a T-DNA insertion in the promoter (sco1-4) of SCO1 display conditional seedling-lethal phenotypes. Seedlings of these alleles exhibit cotyledon and hypocotyl albinism due to improper chloroplast development, and normally die shortly after germination. However, when germinated on media supplemented with sucrose, the mutant plants can produce photosynthetically-active green leaves from the apical meristem. CONCLUSION: The developmental stage-specific phenotype of the conditional-lethal sco1 alleles reveals differences in chloroplast formation during seedling germination compared to chloroplast differentiation in cells derived from the shoot apical meristem. Our identification of embryo-lethal mutant alleles in the Arabidopsis elongation factor G indicates that SCO1 is essential for plant growth, consistent with its predicted role in chloroplast protein translation.
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spelling pubmed-20419502007-10-25 Mutations in a plastid-localized elongation factor G alter early stages of plastid development in Arabidopsis thaliana Ruppel, Nicholas J Hangarter, Roger P BMC Plant Biol Research Article BACKGROUND: Proper development of plastids in embryo and seedling tissues is critical for plant development. During germination, plastids develop to perform many critical functions that are necessary to establish the seedling for further growth. A growing body of work has demonstrated that components of the plastid transcription and translation machinery must be present and functional to establish the organelle upon germination. RESULTS: We have identified Arabidopsis thaliana mutants in a gene that encodes a plastid-targeted elongation factor G (SCO1) that is essential for plastid development during embryogenesis since two T-DNA insertion mutations in the coding sequence (sco1-2 and sco1-3) result in an embryo-lethal phenotype. In addition, a point mutation allele (sco1-1) and an allele with a T-DNA insertion in the promoter (sco1-4) of SCO1 display conditional seedling-lethal phenotypes. Seedlings of these alleles exhibit cotyledon and hypocotyl albinism due to improper chloroplast development, and normally die shortly after germination. However, when germinated on media supplemented with sucrose, the mutant plants can produce photosynthetically-active green leaves from the apical meristem. CONCLUSION: The developmental stage-specific phenotype of the conditional-lethal sco1 alleles reveals differences in chloroplast formation during seedling germination compared to chloroplast differentiation in cells derived from the shoot apical meristem. Our identification of embryo-lethal mutant alleles in the Arabidopsis elongation factor G indicates that SCO1 is essential for plant growth, consistent with its predicted role in chloroplast protein translation. BioMed Central 2007-07-13 /pmc/articles/PMC2041950/ /pubmed/17629920 http://dx.doi.org/10.1186/1471-2229-7-37 Text en Copyright © 2007 Ruppel and Hangarter; licensee BioMed Central Ltd. http://creativecommons.org/licenses/by/2.0 This is an Open Access article distributed under the terms of the Creative Commons Attribution License ( (http://creativecommons.org/licenses/by/2.0) ), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
spellingShingle Research Article
Ruppel, Nicholas J
Hangarter, Roger P
Mutations in a plastid-localized elongation factor G alter early stages of plastid development in Arabidopsis thaliana
title Mutations in a plastid-localized elongation factor G alter early stages of plastid development in Arabidopsis thaliana
title_full Mutations in a plastid-localized elongation factor G alter early stages of plastid development in Arabidopsis thaliana
title_fullStr Mutations in a plastid-localized elongation factor G alter early stages of plastid development in Arabidopsis thaliana
title_full_unstemmed Mutations in a plastid-localized elongation factor G alter early stages of plastid development in Arabidopsis thaliana
title_short Mutations in a plastid-localized elongation factor G alter early stages of plastid development in Arabidopsis thaliana
title_sort mutations in a plastid-localized elongation factor g alter early stages of plastid development in arabidopsis thaliana
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2041950/
https://www.ncbi.nlm.nih.gov/pubmed/17629920
http://dx.doi.org/10.1186/1471-2229-7-37
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