ORF C4 of Tomato Leaf Curl Geminivirus Is a Determinant of Symptom Severity
Identifieur interne : 004416 ( Main/Exploration ); précédent : 004415; suivant : 004417ORF C4 of Tomato Leaf Curl Geminivirus Is a Determinant of Symptom Severity
Auteurs : Justin E. Rigden [Australie] ; Leslie R. Krake [Australie] ; M Ali Rezaian [Australie] ; Ian B. Dry [Australie]Source :
- Virology [ 0042-6822 ] ; 1994.
Abstract
Abstract: A tomato leaf curl virus (TLCV) mutant has been constructed in vitro that contains T-to-C replacements at nucleotides 2457 and 2463 within the C4 open reading frame (ORF). The mutations destroy the two possible initiator AUG codens for the C4 ORF without disrupting the coding capacity of the C1 ORF which entirely overlaps the C4 ORF. Agroinoculation of the C4 mutant TLCV into three alternative experimental hosts for the virus (Datura stramonium, Lycopersicon esculentum, and Nicotiana tabacum) gives rise to infections which show dramatically reduced symptoms when compared to a wild-type infection, while retaining wild-type levels of all viral DNA species. In most cases the mutations were stably inherited by progeny virus. However, a single tomato plant inoculated with the mutant developed phenotypically wild-type symptoms and was subsequently shown to contain progeny virus in which the mutation at position 2457 had reverted to wild-type sequence, indicating that this AUG may be the site of initiation of translation of the C4 product in the wild-type virus. The results suggest that the C4 ORF encodes a polypeptide which is not required by TLCV to replicate or to spread through the host plant, but is involved in symptom development.
Url:
DOI: 10.1006/viro.1994.1606
Affiliations:
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<record><TEI wicri:istexFullTextTei="biblStruct"><teiHeader><fileDesc><titleStmt><title xml:lang="en">ORF C4 of Tomato Leaf Curl Geminivirus Is a Determinant of Symptom Severity</title><author><name sortKey="Rigden, Justin E" sort="Rigden, Justin E" uniqKey="Rigden J" first="Justin E." last="Rigden">Justin E. Rigden</name></author><author><name sortKey="Krake, Leslie R" sort="Krake, Leslie R" uniqKey="Krake L" first="Leslie R." last="Krake">Leslie R. Krake</name></author><author><name sortKey="Rezaian, M Ali" sort="Rezaian, M Ali" uniqKey="Rezaian M" first="M Ali" last="Rezaian">M Ali Rezaian</name></author><author><name sortKey="Dry, Ian B" sort="Dry, Ian B" uniqKey="Dry I" first="Ian B." last="Dry">Ian B. 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Rigden</name><affiliation wicri:level="1"><country xml:lang="fr">Australie</country><wicri:regionArea>CSIRO Division of Horticulture, GPO Box 350, Adelaide 5001</wicri:regionArea><wicri:noRegion>Adelaide 5001</wicri:noRegion></affiliation></author><author><name sortKey="Krake, Leslie R" sort="Krake, Leslie R" uniqKey="Krake L" first="Leslie R." last="Krake">Leslie R. 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Dry</name><affiliation wicri:level="1"><country xml:lang="fr">Australie</country><wicri:regionArea>CSIRO Division of Horticulture, GPO Box 350, Adelaide 5001</wicri:regionArea><wicri:noRegion>Adelaide 5001</wicri:noRegion></affiliation></author></analytic><monogr></monogr><series><title level="j">Virology</title><title level="j" type="abbrev">YVIRO</title><idno type="ISSN">0042-6822</idno><imprint><publisher>ELSEVIER</publisher><date type="published" when="1994">1994</date><biblScope unit="volume">204</biblScope><biblScope unit="issue">2</biblScope><biblScope unit="page" from="847">847</biblScope><biblScope unit="page" to="850">850</biblScope></imprint><idno type="ISSN">0042-6822</idno></series></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0042-6822</idno></seriesStmt></fileDesc><profileDesc><textClass></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Abstract: A tomato leaf curl virus (TLCV) mutant has been constructed in vitro that contains T-to-C replacements at nucleotides 2457 and 2463 within the C4 open reading frame (ORF). The mutations destroy the two possible initiator AUG codens for the C4 ORF without disrupting the coding capacity of the C1 ORF which entirely overlaps the C4 ORF. Agroinoculation of the C4 mutant TLCV into three alternative experimental hosts for the virus (Datura stramonium, Lycopersicon esculentum, and Nicotiana tabacum) gives rise to infections which show dramatically reduced symptoms when compared to a wild-type infection, while retaining wild-type levels of all viral DNA species. In most cases the mutations were stably inherited by progeny virus. However, a single tomato plant inoculated with the mutant developed phenotypically wild-type symptoms and was subsequently shown to contain progeny virus in which the mutation at position 2457 had reverted to wild-type sequence, indicating that this AUG may be the site of initiation of translation of the C4 product in the wild-type virus. The results suggest that the C4 ORF encodes a polypeptide which is not required by TLCV to replicate or to spread through the host plant, but is involved in symptom development.</div></front></TEI><affiliations><list><country><li>Australie</li></country></list><tree><country name="Australie"><noRegion><name sortKey="Rigden, Justin E" sort="Rigden, Justin E" uniqKey="Rigden J" first="Justin E." last="Rigden">Justin E. Rigden</name></noRegion><name sortKey="Dry, Ian B" sort="Dry, Ian B" uniqKey="Dry I" first="Ian B." last="Dry">Ian B. Dry</name><name sortKey="Krake, Leslie R" sort="Krake, Leslie R" uniqKey="Krake L" first="Leslie R." last="Krake">Leslie R. Krake</name><name sortKey="Rezaian, M Ali" sort="Rezaian, M Ali" uniqKey="Rezaian M" first="M Ali" last="Rezaian">M Ali Rezaian</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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