seminario_29Prelecionista: Miraine Kapeua Ndacnou Data: 29/03/2022, às 16h, no Auditório 1 do CCBII* Orientador: Robert Weingart Barreto Co-orientador: Lucas Magalhães de Abreu

Resumo:
Hemileia vastatrix – the coffee leaf rust (CLR) fungus – is native from Africa and an exotic invasive species in all other areas of the world where coffee is grown. It causes the worst disease of coffee, but in Africa, it is not regarded as the worst pathogen of the crop. Management of CLR has relied on escaping the disease through the highland plantation, using resistant coffee varieties and fungicide applications. There are limitations for each of these strategies and novel approaches for CRL management are necessary. It has been conjectured that natural enemies of H. vastatrix endemic to Africa might have been overlooked and that such antagonists might have the potential for CLR management. Surveys conducted since 2015 in Africa have revealed numerous mycoparasitic fungi attacking CLR in the field as well as endophytic fungi growing inside healthy coffee plants (several of which were, or are being, described as new to science), which might play a bodyguard role, protecting the plants against the disease. Results of previous studies and of the present research seem to confirm this hypothesis. Here we identified selected endophytic isolates (confirmed here to grow as endophytes in coffee) as: Aspergillus flavus, Clonostachys byssicola, C. rhizophaga and C. rosea f. rosea. The isolate of A. flavus was shown not to produce aflatoxin. Trichoderma strains were demonstrated to inhibit the germination of H. vastatrix in vitro. Beforehand applications a series of isolates, of Clonostachys, Trichoderma and also of A. flavus, followed by inoculation with H. vastatrix led to a significant reduction in CLR severity. This is the first study reporting anti-CLR biocontrol potential for African isolates of A. flavus, Clonostachys and Trichoderma.

*Atenção: Esta apresentação marca a retomada dos seminários presenciais