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The use of the PMI/mannose selection system to recover transgenic sweet orange plants (Citrus sinensis L. Osbeck)

Identifieur interne : 002B19 ( Main/Exploration ); précédent : 002B18; suivant : 002B20

The use of the PMI/mannose selection system to recover transgenic sweet orange plants (Citrus sinensis L. Osbeck)

Auteurs : R. L. Boscariol [Brésil] ; W. A. B. Almeida [Brésil] ; M. T. V. C. Derbyshire [Brésil] ; F. A. A. Mourao Filho [Brésil] ; B. M. J. Mendes [Brésil]

Source :

RBID : Pascal:04-0049994

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English descriptors

Abstract

A new method for obtaining transgenic sweet orange plants was developed in which positive selection (Positech) based on the Escherichia coli phosphomannose-isomerase (PMI) gene as the selectable marker gene and mannose as the selective agent was used. Epicotyl segments from in vitro-germinated plants of Valencia, Hamlin, Natal and Pera sweet oranges were inoculated with Agrobacterium tumefaciens EHA101-pNOV2116 and subsequently selected on medium supplemented with different concentrations of mannose or with a combination of mannose and sucrose as a carbon source. Genetic transformation was confirmed by PCR and Southern blot. The transgene expression was evaluated using a chlorophenol red assay and isoenzymes. The transformation efficiency rate ranged from 3% to 23.8%, depending on cultivar. This system provides an efficient manner for selecting transgenic sweet orange plants without using antibiotics or herbicides.


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Le document en format XML

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<term>Agrobacterium tumefaciens</term>
<term>Chemical composition</term>
<term>Citrus sinensis</term>
<term>Citrus sinensis (drug effects)</term>
<term>Citrus sinensis (genetics)</term>
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<term>Mannose-6-Phosphate Isomerase (metabolism)</term>
<term>Mannose-6-phosphate isomerase</term>
<term>Marker assisted selection</term>
<term>Micropropagation</term>
<term>Plants, Genetically Modified (drug effects)</term>
<term>Plants, Genetically Modified (genetics)</term>
<term>Plants, Genetically Modified (growth & development)</term>
<term>Sucrose</term>
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<term>Genetic Markers</term>
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<term>Mannose-6-Phosphate Isomerase</term>
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<term>Fructose</term>
<term>Mannose</term>
<term>Sucrose</term>
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<keywords scheme="MESH" qualifier="drug effects" xml:lang="en">
<term>Citrus sinensis</term>
<term>Gene Expression Regulation, Enzymologic</term>
<term>Plants, Genetically Modified</term>
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<keywords scheme="MESH" qualifier="genetics" xml:lang="en">
<term>Citrus sinensis</term>
<term>Plants, Genetically Modified</term>
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<term>Milieu culture</term>
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<term>Citrus sinensis</term>
<term>Agrobacterium tumefaciens</term>
<term>Mannose</term>
<term>Saccharose</term>
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<term>Plante transgénique</term>
<term>Saccharose</term>
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<front>
<div type="abstract" xml:lang="en">A new method for obtaining transgenic sweet orange plants was developed in which positive selection (Positech) based on the Escherichia coli phosphomannose-isomerase (PMI) gene as the selectable marker gene and mannose as the selective agent was used. Epicotyl segments from in vitro-germinated plants of Valencia, Hamlin, Natal and Pera sweet oranges were inoculated with Agrobacterium tumefaciens EHA101-pNOV2116 and subsequently selected on medium supplemented with different concentrations of mannose or with a combination of mannose and sucrose as a carbon source. Genetic transformation was confirmed by PCR and Southern blot. The transgene expression was evaluated using a chlorophenol red assay and isoenzymes. The transformation efficiency rate ranged from 3% to 23.8%, depending on cultivar. This system provides an efficient manner for selecting transgenic sweet orange plants without using antibiotics or herbicides.</div>
</front>
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