Antibiose de fungos do filoplano de plantas de arroz a Magnaporthe oryzae


Rice leaf blast (Magnaporthe oryzae) causes indirect and significant yield losses. Rice leaves are colonized by several microorganisms, including important non-pathogenic fungi involved in biological control. A field experiment was carried out using variety Aimoré in organic agriculture under no-till and conventional planting systems with four cover crops (crotalaria, pigeon pea, sorghum, green manure crop ‘mucuna’), and four replications aiming at selecting phylloplane fungi from rice leaves. Three rice leaves were collected per plot, 70 days after planting for quantifying phylloplane fungi. From the middle third of the leaves 5-cm parts were cut and the adaxial surface was pressed on the culture medium (PDA). After 72 h the number of colony-forming was assessed. Antibiosis was tested using the paired culture method. We identified 15 fungi, among which, the most frequent ones in no-till system were Sporobolomyces sp., Phoma sp., and Fusarium sp. and under conventional planting system, Sporobolomyces sp., Phoma sp., Penicillium sp., and Cephalosporium sp. were predominant. The number of colony-forming was significantly higher under no-till than conventional planting system (P < 0.037). Among the 15 phylloplane fungi identified, Epicoccum sp. and Sporobolomyces sp. showed antagonism to M. oryzae.


v. 7, n. 1, p.1-6, 2010.


Antagonistas, Brusone, Controle biológico


ARAÚJO, Leila Garcês de ; MENDANHA, Raquel Acácio; GONÇALVES, Fábio José; SILVA, Gisele Barata da; FILIPPI, Marta Cristina da Corsi; PRABHU, Anne Sitarama. Antibiose de fungos do filoplano de plantas de arroz a Magnaporthe oryzae. Revista de Biologia Neotropical, v. 7, n. 1, p.1-6, 2010. Disponível em: <>.