Recurrent selection for resistance to Sclerotinia sclerotiorum in sunflowers using artificial infections - Université Clermont Auvergne Accéder directement au contenu
Article Dans Une Revue Agronomie Année : 1984

Recurrent selection for resistance to Sclerotinia sclerotiorum in sunflowers using artificial infections

Résumé

Three generations of recurrent selection for Sclerotinia sclerotiorum resistance have been carried out on 2 populations of sunflower. For the first 2 cycles a test measuring the extension rate of S. sclerotiorum mycelium on the back of the capitulum was used. For the 3r d cycle this test was employed together with one based on inoculation of the floral surface of the capitulum with an ascospore suspension, after which the length of the latent period until symptom appearance was measured. From the 1st to the 2nd cycle, both populations showed considerable improvement. The mean of mycelium extension on the restorer population was reduced from 200 0l0 of that on control variety 'Remil' to 104% and on the maintainer population from 281% to 91 %. At the same time the variance was considerably reduced. However the results of the 3rd cycle did not show any improvement. The restorer population had the same mean, 106% as in the second cycle, although with a further reduced variance and the maintainer population was slightly poorer than in the 2nd cycle (with a mean of 113 %). In the 3rd cycle there was no correlation between results of the mycelium and ascospore tests. The results of the latter showed wide variation, with the population mean between those of 'Airelle' and 'Remil', so it should be possible to breed for resistance to ascospore installation. Since this test is similar to the natural cycle of S. sclerotiorum most weight should be given to its results. The possible reasons for the lack of improvement with the mycelium test are discussed. It is proposed to continue the programme with a weaker selection pressure for both characters during several generations in order to determine whether real increases in S. sclerotiorum resistance can be obtained.

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Dates et versions

hal-00964406 , version 1 (01-06-2020)

Identifiants

  • HAL Id : hal-00964406 , version 1
  • PRODINRA : 24172

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Felicity F. Vear, Denis D. Tourvieille de Labrouhe. Recurrent selection for resistance to Sclerotinia sclerotiorum in sunflowers using artificial infections. Agronomie, 1984, 4 (8), pp.789-794. ⟨hal-00964406⟩
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