Open Access

Structure génétique des cécidomyies des céréales en Tunisie

  • Hanem Makni1Email author,
  • Moez Sellami1,
  • Mohamed Marrakchi1 and
  • Nicole Pasteur2
Contributed equally
Genetics Selection Evolution200032:577

https://doi.org/10.1186/1297-9686-32-6-577

Received: 19 October 1999

Accepted: 2 May 2000

Published: 15 November 2000

Abstract

Genetic structure of Hessian flies in Tunisia. The genetic structure of M. destructor and M. hordei 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 Mayetiola species. M. destructor males displayed no heterozygosity at the Pgm3 locus, indicating that they were hemizygous as is the PGM locus in North America. In M. hordei, heterozygous males were observed at all loci, but strong heterozygote deficits were found at two loci (Mdh2 et Hk). Since no such deficit was observed in females, the population structure of M. hordei was studied only in females. Although heterozygosity was two fold higher in M. hordei than in M. destructor, the two species were similar for other genetic characteristics, including a low (Fst < 0.05) but significant (P < 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 M. destructor biotype.

Keywords

genetic structuregene flowsex determinationallozymesMayetiola destructor and hordei

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Notes

Authors’ Affiliations

(1)
Laboratoire de génétique moléculaire, Immunologie et biotechnologie, Faculté des sciences, Campus universitaire
(2)
Institut des sciences de l'évolution (UMR-CNRS 5554), Génétique et environnement, Université de Montpellier-II (CC065)

Copyright

© INRA, EDP Sciences 2000

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