Fungic microflora of Panicum maximum and Styosanthes spp. commercial seed

Carlos Eduardo Marchi, Celso Dornelas Fernandes, Marcelo Leandro Bueno, Margareth Vieira Batista, Larissa Rodrigues Fabris

Abstract


The sanitary quality of 26 lots commercial seeds of tropical forages, produced in different regions (2004-05 and 2005-06) was analyzed. The lots were composed of seeds of Panicum maximum ('Massai', 'Mombaça' e 'Tanzânia') and stylo ('Estilosantes Campo Grande' - ECG). Additionally, seeds of two lots of P. maximum for exportation were analyzed. The blotter test was used, at 20ºC under alternating light and darkness in a 12 h photoperiod, for seven days. The Aspergillus, Cladosporium and Rhizopus genus consisted the secondary or saprophytes fungi (FSS) with greatest frequency in P. maximum lots. In general, there was low incidence of these fungus in the seeds. In relation to pathogenic fungi (FP), it was detected high frequency of contaminated lots by Bipolaris, Curvularia, Fusarium and Phoma genus. Generally, there was high incidence of FP in P. maximum seeds. The occurrence of Phoma sp. was hight, because in 81% of the lots showed incidence superior to 50%. In 'ECG' seeds it was detected FSS (Aspergillus, Cladosporium, and Penicillium genus) and FP (Bipolaris, Curvularia, Fusarium and Phoma genus), usually, in low incidence. FSS and FP were associated to P. maximum seeds for exportation, with significant incidence in some cases. The results indicated that there was a limiting factor in all producer regions regarding sanitary quality of the seeds.


Keywords


Guinea grass; Stylo; Pathology of seeds; Fungi; Sanitary quality



DOI: http://dx.doi.org/10.5433/1679-0359.2010v31n3p575

Semina: Ciênc. Agrár.
Londrina - PR
E-ISSN 1679-0359
DOI: 10.5433/1679-0359
E-mail: semina.agrarias@uel.br
Este obra está licenciado com uma Licença Creative Commons Atribuição-NãoComercial 4.0 Internacional