Abstract
The effect of soybean seed infection by <i>Peronospora manshurica</i> and <i>Pseudomonas syringae</i> pv. <i>glycinea</i> on the chemical content of some soybean lines and varieties susceptible to both pathogens was estimated. The amount of protein and oil was determined for soybean seed samples collected from two different localities in 1980. In <i>P. manshurica</i> oospore-encrusted seeds protein content was higher and oil content lower than in healthy ones. It could be seen especially in samples of the 'Acme' variety cultivated in both localities. Seed infection by <i>P. syringae</i> pv. <i>glycinea</i> occasionally influenced the protein, oil and fatty acid content as compared with the control. This was noted only in single cases. Analysis of fatty acid composition demonstrated a higher free fatty acid content in soybean seed infected by <i>P. manshurica</i>. These results showed undoubtedly the influence of pathogens, specially seed-borne fungi on the chemical soybean seed composition. This analysis can be an introduction for more detailed investigations on the effect of these or other pathogens on soybean seed yield quality.
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