Structure génétique des cécidomyies des céréales en Tunisie
<p>Abstract</p> <p><b>Genetic structure of Hessian flies in Tunisia</b>. The genetic structure of <it>M. destructor </it>and <it>M. hordei </it>was investigated by sampling 21 fields of cereals in 14 localities of central and southern Tunisia. As...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | deu |
| Published: |
BMC
2000-11-01
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| Series: | Genetics Selection Evolution |
| Subjects: | |
| Online Access: | http://www.gsejournal.org/content/32/6/577 |
| Summary: | <p>Abstract</p> <p><b>Genetic structure of Hessian flies in Tunisia</b>. The genetic structure of <it>M. destructor </it>and <it>M. hordei </it>was investigated by sampling 21 fields of cereals in 14 localities of central and southern Tunisia. As previously shown, there was no strict association between the cereal species (wheat, barley and oat) and the <it>Mayetiola </it>species. <it>M. destructor </it>males displayed no heterozygosity at the <it>Pgm3 </it>locus, indicating that they were hemizygous as is the <it>PGM </it>locus in North America. In <it>M. hordei</it>, heterozygous males were observed at all loci, but strong heterozygote deficits were found at two loci (<it>Mdh2 </it>et <it>Hk</it>). Since no such deficit was observed in females, the population structure of <it>M. hordei </it>was studied only in females. Although heterozygosity was two fold higher in <it>M. hordei </it>than in <it>M. destructor</it>, the two species were similar for other genetic characteristics, including a low (Fst < 0.05) but significant (<it>P </it>< 0.05) genetic differentiation, no isolation by distance, and similar rates of gene flow (5.7 ≤ Nm ≤ 9.6). These results are discussed in relation to their consequences in the event of controlling Tunisian Hessian flies using wheat cultivars that are resistant to a <it>M. destructor </it>biotype.</p> |
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| ISSN: | 0999-193X 1297-9686 |