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Preliminary studies on pathogen incidence in fresh consumption soyabean seeds.

Pioli, R. N.; Benavidez, R.; Morandi, E. N.;

Fitopatologia Year: 1997 Vol: 32 Issue: 2 Pages: 116-120 Ref: 10 ref.

1997

บทคัดย่อ

Preliminary studies on pathogen incidence in fresh consumption soyabean seeds.

To identify and quantify pathogen incidence in introduced soyabean seeds, 18 genotypes of different sources were sown in Zavalla, Santa Fe, Argentina. The plant material was harvested at development stage R6 and dried outdoors. A total of 100 seeds/genotype was superficially disinfected and incubated for 7 days in a light:dark regime (12 h:12 h) at 24 deg C. The pathogens isolated were Alternaria sp., Cercospora kikuchii, Colletotrichum truncatum, Fusarium sp. (F. graminearum [Gibberella zeae], F. equiseti, F. semitectum [F. pallidoroseum], F. moniliforme [G. fujikuroi]), Phomopsis sp. (P. phaseoli), Rhizoctonia solani, Curvularia sp., Nigrospora sp., Periconia sp. and bacteria of the genera Pseudomonas and Xanthomonas. The number of infected seeds was expressed as incidence percentage (%I). ANOVAS and correlations were made with Probit's transformed data. Significant differences between genotypes were found in the %I for Alternaria sp., C. kikuchii, Fusarium sp., Phomopsis sp. and bacteria, (F=

6.07, 4.71, 5.94, 18.00 and 9.09 at P<0.001, respectively). The correlations between %I of each pathogen and germination percentage were significant for Alternaria sp., Fusarium sp. and Phomopsis sp. (r=-0.68, -0.96 and -0.99, p<0.01, respectively).