Viabilities of D. subobscura homo‐ and heterokaryotypes at optimal and stress temperatures. II. Seasonal component analysis
Identifieur interne : 000E57 ( Main/Exploration ); précédent : 000E56; suivant : 000E58Viabilities of D. subobscura homo‐ and heterokaryotypes at optimal and stress temperatures. II. Seasonal component analysis
Auteurs : Goran Zivanovic [Serbie] ; Francesc Mestres [Serbie]Source :
- Hereditas [ 0018-0661 ] ; 2010-04.
Abstract
Here we report the viability of natural chromosomal O‐inversion structural homo‐ and heterokaryotypes in a population of D. subobscura from Avala Mountain, Serbia, subjected to cold and heat stress during spring 2004. These results were compared with those observed in the same population in September 2004. We detected protection of a great number of lethal genes in O‐chromosome lethal heterozygous combinations, independently of inversion backgrounds and temperature stress. The positive epistatic interactions of mildly‐deleterious genes observed only in O‐inversion heterokaryotypes (at distinct temperatures) and lethal genes in O‐inversion homokaryotypes (under temperature stress only) could be responsible for reducing the genetic load. The seasonal fluctuations in frequencies of several chromosomal arrangements and karyotypes indicate a seasonal adaptation to changeable environmental conditions. The sample of D. subobscura collected in spring 2004 was tolerant to cold but not to heat, and these results point to tolerance to extreme low temperatures, possibly as a result of natural selection. Also, a non‐random distribution of distinct combinations of viability classes among several O‐inversion karyotypes (under both optimal conditions and heat stress) was observed. This observation could be taken as evidence of co‐adaptation: different capacities of several O‐inversion karyotypes with different combinations of genes to tolerate a range of temperatures. We conclude that frequency‐dependent and supergene selection are balancing selection mechanisms and are responsible for the protection of chromosomal inversions in natural populations of D. subobscura.
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DOI: 10.1111/j.1601-5223.2010.2164.x
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Seasonal component analysis</title><author><name sortKey="Zivanovic, Goran" sort="Zivanovic, Goran" uniqKey="Zivanovic G" first="Goran" last="Zivanovic">Goran Zivanovic</name><affiliation wicri:level="1"><country xml:lang="fr">Serbie</country><wicri:regionArea>Department of Genetics, Institute for Biological Research “Sinisa Stankovic”, University of Belgrade</wicri:regionArea><wicri:noRegion>University of Belgrade</wicri:noRegion></affiliation></author><author><name sortKey="Mestres, Francesc" sort="Mestres, Francesc" uniqKey="Mestres F" first="Francesc" last="Mestres">Francesc Mestres</name><affiliation wicri:level="1"><country xml:lang="fr">Serbie</country><wicri:regionArea>Department of Genetics, Institute for Biological Research “Sinisa Stankovic”, University of Belgrade</wicri:regionArea><wicri:noRegion>University of Belgrade</wicri:noRegion></affiliation></author></analytic><monogr></monogr><series><title level="j">Hereditas</title><title level="j" type="abbrev">Hereditas</title><idno type="ISSN">0018-0661</idno><idno type="eISSN">1601-5223</idno><imprint><publisher>Blackwell Publishing Ltd</publisher><pubPlace>Oxford, UK</pubPlace><date type="published" when="2010-04">2010-04</date><biblScope unit="volume">147</biblScope><biblScope unit="issue">2</biblScope><biblScope unit="page" from="82">82</biblScope><biblScope unit="page" to="89">89</biblScope></imprint><idno type="ISSN">0018-0661</idno></series><idno type="istex">D3A4A0D8B01B8855741CE45164D8C33BC736A2F3</idno><idno type="DOI">10.1111/j.1601-5223.2010.2164.x</idno><idno type="ArticleID">HRD22164</idno></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0018-0661</idno></seriesStmt></fileDesc><profileDesc><textClass></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Here we report the viability of natural chromosomal O‐inversion structural homo‐ and heterokaryotypes in a population of D. subobscura from Avala Mountain, Serbia, subjected to cold and heat stress during spring 2004. These results were compared with those observed in the same population in September 2004. We detected protection of a great number of lethal genes in O‐chromosome lethal heterozygous combinations, independently of inversion backgrounds and temperature stress. The positive epistatic interactions of mildly‐deleterious genes observed only in O‐inversion heterokaryotypes (at distinct temperatures) and lethal genes in O‐inversion homokaryotypes (under temperature stress only) could be responsible for reducing the genetic load. The seasonal fluctuations in frequencies of several chromosomal arrangements and karyotypes indicate a seasonal adaptation to changeable environmental conditions. The sample of D. subobscura collected in spring 2004 was tolerant to cold but not to heat, and these results point to tolerance to extreme low temperatures, possibly as a result of natural selection. Also, a non‐random distribution of distinct combinations of viability classes among several O‐inversion karyotypes (under both optimal conditions and heat stress) was observed. This observation could be taken as evidence of co‐adaptation: different capacities of several O‐inversion karyotypes with different combinations of genes to tolerate a range of temperatures. We conclude that frequency‐dependent and supergene selection are balancing selection mechanisms and are responsible for the protection of chromosomal inversions in natural populations of D. subobscura.</div></front></TEI><affiliations><list><country><li>Serbie</li></country></list><tree><country name="Serbie"><noRegion><name sortKey="Zivanovic, Goran" sort="Zivanovic, Goran" uniqKey="Zivanovic G" first="Goran" last="Zivanovic">Goran Zivanovic</name></noRegion><name sortKey="Mestres, Francesc" sort="Mestres, Francesc" uniqKey="Mestres F" first="Francesc" last="Mestres">Francesc Mestres</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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