1982/04/01 by R Charudattan, R. Charudattan, K V Rao +1
Agricultural and Biological Sciences · Biochemistry, Genetics and Molecular Biology · #Allelopathy and phytotoxic interactions #Fungal Plant Pathogen Control #Plant Pathogens and Fungal Diseases
paper · pdf · doi:10.1128/aem.43.4.846-849.1982
openalex publication_date 1982/04/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Two crystalline red pigments with phytotoxic activity were isolated from culture filtrates of Alternaria eichhorniae, a pathogen of the water hyacinth Eichhornia crassipes. The pigments were present in the ratio of 4:1 and were identified as bostrycin and 4-deoxybostrycin, respectively. This is the first isolation of 4-deoxybostrycin from a natural source. Bostrycin, 4-deoxybostrycin, and their isopropylidene derivatives induced necrosis on tested plant leaves comparable to the A. eichhorniae-induced necrosis on water hyacinth. The lowest phytotoxic concentrations of crystalline bostrycin and 4-deoxybostrycin on water hyacinth leaves were about 7 and 30 microgram/ml, respectively. Both substances were inhibitory to Bacillus subtilis but were inactive against the fungus Geotrichum candidum.