1992/11/01 by Clinton F. Hodges
Agricultural and Biological Sciences · Biochemistry, Genetics and Molecular Biology · #Plant Pathogens and Fungal Diseases #Plant Pathogens and Resistance #Plant-Microbe Interactions and Immunity
paper · doi:10.1139/b92-271
crossref issued 1992/11/01 · crossref published 1992/11/01 · crossref published-print 1992/11/01 · openalex publication_date 1992/11/01 · crossref created 2008/01/24 · crossref deposited 2020/01/05 · openalex created_date 2025/10/10 · crossref indexed 2026/07/29 · openalex updated_date 2026/07/29
Studies were initiated to determine the pathogenicity of Pythium torulosum to Agrostis palustris roots growing in sand with subsurface black layer produced by the interaction of cyanobacteria and the sulfate-reducing bacterium Desulfovibrio desulfuricans. The interaction of P. torulosum with cyanobacteria and D. desulfuricans was also evaluated. Pythium torulosum decreased the dry weight of roots and shoots of A. palustris to 41 and 35%, respectively, of the control plants in the absence of black layer and the organisms responsible for its formation. The combination of P. torulosum and D. desulfuricans, in the absence of black layer, induced the most severe decrease in root (20% of controls) and shoot (25% of controls) dry weights. Damage to roots induced by P. torulosum in combination with various isolates of cyanobacteria, in the absence of black layer, was equal to that of P. torulosum alone; shoot dry weight loss was less than that caused by P. torulosum alone. Pathogenicity of P. torulosum to roots when combined with cyanobacteria and D. desulfuricans in the presence of black layer was the same as that with P. torulosum alone and in combination with cyanobacteria; shoot dry weight did not differ from that of P. torulosum combined with cyanobacteria. The presence of cyanobacteria with P. torulosum and D. desulfuricans in black-layered sand decreased root and shoot dry weight loss induced by the two latter organisms. Key words: anaerobic, black plug layer, golf greens, sulfate reduction.