Identification of fungi on diseased soybean seeds harvested during a high rainfall period in Mato Grosso do Sul, Brazil / Identificação de fungos em sementes doentes de soja colhidas durante um período de intensa precipitação pluviométrica em Mato Grosso do Sul, Brasil
Biosci. j. (Online)
; 29(2): 386-391, mar./apr. 2013.
Article
en En
| LILACS
| ID: biblio-914404
Biblioteca responsable:
BR396.4
ABSTRACT
The aim of this work was to evaluate the incidence of several genera of fungi on soybean seeds harvested duringa period of high rainfall in Mato Grosso do Sul, Brazil. Agronomic trait means from 110 plants were determined from data obtained at the time of harvest. From the seeds obtained, 800 were selected that showed discoloration of the tegument, with or without visible fungal colonies. Half of the seeds were superficially disinfected by immersion in a 1% sodium hypochlorite solution for 3 minutes, and all 800 seeds were then incubated to stimulate fungal growth. A modified blotter-test method was used in which 25 seeds were deposited on filter paper placed in a germination box, and a saturated NaCl solution (-1,0MPa) was used to inhibit germination of the seeds. After incubation for 7 days at 25ºC, fungal growth was inspected using optical and stereoscopic microscopes to identify the genera of the fungi present on the basis of their morphologies. On average, there were 50,3 pods per plant, 2,0 seeds per pod, and 31,7 visibly diseased seeds per soybean plant. The mean weight of 100 seeds was 14,72 g and there were 15,30 g of seed per plant, of which 4,58 g were visibly diseased on average. Among the fungi observed were Fusarium spp. (80-90%), Phomopsis spp. (39-45 %), Cercospora spp. (22-30 %), Colletotrichumspp. (5-10 %), Rhizoctoniaspp. (< 2%) and Penicilliumspp. These results showed that there is a need to breed new soybean genotypes with resistance to the most common seed diseases.
Palabras clave
Texto completo:
1
Colección:
01-internacional
Base de datos:
LILACS
Asunto principal:
Semillas
/
Glycine max
/
Hongos
/
Noxas
Tipo de estudio:
Diagnostic_studies
/
Prognostic_studies
País/Región como asunto:
America do sul
/
Brasil
Idioma:
En
Revista:
Biosci. j. (Online)
Asunto de la revista:
Agricultura
/
Disciplinas das Cincias Biol¢gicas
/
Pesquisa Interdisciplinar
Año:
2013
Tipo del documento:
Article
País de afiliación:
Brasil
/
Estados Unidos