Isolation and characterization of antagonistic fungi against potato scab pathogens from potato field soils.

Potato scab is a serious plant disease caused by several Streptomyces sp., and effective control methods remain unavailable. Although antagonistic bacteria and phages against potato scab pathogens have been reported, to the best of our knowledge, there is no information about fungi that are antagonistic to the pathogens.

Development of a genotyping method for potato scab pathogens based on multiplex PCR.

Scab disease significantly damages potato and other root crops. Streptomyces scabiei, S. acidiscabiei, and S.

Extracellular acidic polysaccharide production by a two-membered bacterial coculture.

A two-membered coculture of strains KYM-7 and KYM-8, identified as Cellulomonas cellulans and Agrobacterium tumefaciens, respectively, produced a large amount of an extracellular polysaccharide, designated APK-78, from starch. Each strain in pure culture produced only very little amount of polysaccharide from starch; the coexistence of the two strains from the early stage of cultivation was indispensable for a large amount of polysaccharide to be produced. The polysaccharide APK-78 was acidic and composed of glucose, galactose, succinic acid, and pyruvic acid with a molar ratio of 8.