Phytopathology (2011) 101, 555-566
Thomas C. Harrington, Daniel J. Thorpe and Acelino C. Alfenas (2011)
Genetic variation and variation in aggressiveness to native and exotic hosts among Brazilian populations of Ceratocystis fimbriata
Phytopathology 101 (5), 555-566
Abstract: Ceratocystis fimbriata is a complex of many species that cause wilt and cankers on woody plants and rot of storage roots or corms of many economically important crops worldwide. In Brazil, C. fimbriata infects different cultivated crop plants that are not native to Brazil, including Gmelina arborea, Eucalyptus spp., Mangifera indica (mango), Ficus carica (fig), and Colocasia esculenta (inhame). Phylogenetic analyses and inoculation studies were performed to test the hypothesis that there are host-specialized lineages of C. fimbriata in Brazil. The internal transcribed spacer region ribosomal DNA sequences varied greatly but there was little resolution of lineages based on these sequences. A portion of the MAT1-2 mating type gene showed less variation, and this variation corresponded more closely with host of origin. However, mango isolates were found scattered throughout the tree. Inoculation experiments on the five exotic hosts showed substantial variation in aggressiveness within and among pathogen populations. Native hosts from the same families as the exotic hosts tended to be less susceptible than the cultivated hosts, but there was little correlation between aggressiveness to the cultivated and native hosts of the same family. Cultivation and vegetative propagation of exotic crops may select for strains that are particularly aggressive on those crops.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Link to article at publishers website
Database assignments for author(s): Thomas C. Harrington, Acelino C. Alfenas
Research topic(s) for pests/diseases/weeds:
general biology - morphology - evolution
molecular biology - genes
Pest and/or beneficial records:
| Beneficial | Pest/Disease/Weed | Crop/Product | Country | Quarant.
|
|---|---|---|---|---|
| Ceratocystis fimbriata | Ficus (crop) | |||
| Ceratocystis fimbriata | Mango (Mangifera indica) | |||
| Ceratocystis fimbriata | Eucalypt (Eucalyptus) | |||
| Ceratocystis fimbriata | Taro (Colocasia) | |||
| Ceratocystis fimbriata | Gmelina (crop) | |||
| Ceratocystis cacaofunesta | ||||
| Ceratocystis platani | ||||
| Ceratocystis manginecans |
