Skip to Main content Skip to Navigation
New interface
Theses

Résistance de la tomate, l’aubergine et le piment à Ralstonia solanacearum : interactions entre les géniteurs de résistance et la diversité bactérienne, caractérisation et cartographie des facteurs génétiques impliqués chez l'aubergine

Abstract : The plant pathogenic soil-borne bacteria Ralstonia solanacearum causes heavy damage to solanaceous crops. One of the dilemmas for varietal breeding of solanaceous crops is the circumvention of the resistance to R. solanacearum due to the genotypic variability and plasticity of this pathogen. Thirty accessions of Tomato, Eggplant, and Pepper (Core-TEP), screened with a collection of 12 representatives strains of R. solanacearum phylotype I, II and III (Core-Rs2) within the species complex ranked from highly resistant to highly susceptible. The strains were grouped according to there profile of virulence on all three solanaceous, and by considering each species individually. We refer to these groups respectively, as pathoprofiles and pathotypes. No universal resistance was found for the three host species. Genetic analysis of resistance to R. solanacearum in eggplant was conducted against four strains of phylotype I. We used a population of recombinant lines F6 as well as the generations derived from the intraspecific cross between S. melongena MM738 (S) and AG91-25 (R). A genetic map was built with 119 markers a combination of AFLPs, SSRs and SRAPs positioned on 18 linkage groups, for a total length of 884 cM. The genetic analysis revealed that resistance to strains CMR134, PSS366, and GMI1000 was controlled by one single major gene, which explained up to 87% of the phenotypic variation. When the resistance against the highly virulent PSS4 strain is tested, this gene is not detected. In this case, a significant QTL with intermediate effect that explains up to 38% of phenotypic variation was found on another linkage group for this strain.
Document type :
Theses
Complete list of metadata

https://tel.archives-ouvertes.fr/tel-00752358
Contributor : ABES STAR :  Contact
Submitted on : Thursday, November 15, 2012 - 3:02:13 PM
Last modification on : Thursday, March 24, 2022 - 3:37:19 AM

File

2010LARE0026_Lebeau_5.pdf
Version validated by the jury (STAR)

Identifiers

  • HAL Id : tel-00752358, version 1
  • PRODINRA : 330465

Citation

Aurore Lebeau. Résistance de la tomate, l’aubergine et le piment à Ralstonia solanacearum : interactions entre les géniteurs de résistance et la diversité bactérienne, caractérisation et cartographie des facteurs génétiques impliqués chez l'aubergine. Sciences agricoles. Université de la Réunion, 2010. Français. ⟨NNT : 2010LARE0026⟩. ⟨tel-00752358⟩

Share

Metrics

Record views

1333

Files downloads

5298