Showing papers on "Bacillus isolates published in 1997"
TL;DR: Joint seed+soil treatment with some selected antagonisticBacillus spp.
Abstract: The antagonistic activity againstin vitro growth ofFusarium oxysporum f. sp.ciceris was determined for 74 bacterial isolates obtained from the rhizosphere of chickpeas grown in two field soils with different histories of Fusarium wilt, and for seven isolates ofPseudomonas spp. from culture collections. Twenty-four isolates ofBacillus spp. andPseudomonas chlororaphis 30-84 showed a strong antagonism against three races (0, 1 and 5) ofF. o. ciceris tested. Three selectedBacillus isolates andP. chlororaphis 30-84 were further tested against 30 isolates of races 0, 1 and 5 ofF. o. ciceris, races 0, 1 and 2 ofF. o. melonis, F. o. phaseoli and nonpathogenicF. oxysporum. Bacillus isolates differed in their antagonistic activity and were less inhibitory to mycelial growth ofF. o. ciceris than to that of other fungal isolates. Furthermore, the extent of growth inhibition ofF. o. ciceris was influenced both by bacterial isolates and by race of the pathogen. Cell-free culture filtrates of fourBacillus isolates inhibited conidial germination and hyphal growth ofF. o. ciceris and nonpathogenicF. oxysporum. Joint seed+soil treatment with some selected antagonisticBacillus spp. isolates suppressed disease caused by the highly virulentF. o. ciceris race-5 in cv. ICCV 4 and cv. PV 61 chickpeas. However, the degree of protection was influenced by the host genotype and the inoculum concentration of the pathogen.
139 citations
TL;DR: Spore‐forming Bacillus isolates recovered from different Jordanian habitats showed the presence of 16 different Bacillus species, and forty‐six of them were pathogenic to the third instar larvae of Drosophila melanogaster.
Abstract: F. AL-MOMANI AND M.M.M. MEQDAM. 1997.Spore-forming Bacillus isolates were recovered from different Jordanian habitats. Of 37 samples, 187 colonies were selected. Forty-six (24·6%) of them were pathogenic to the third instar larvae of Drosophila melanogaster. Larvicidal activity of the isolates was from 0% (non-cultivated soil) to 83·3% (decomposed animal residues). The total spore count per gram weight varied from 0·1 10 5 ‐18 10 5 among the 37 tested samples. Morphological and microscopical identification of the isolates showed the presence of 16 different Bacillus species. The pathogenic isolates were B. thuringiensis (44) and B. sphaericus (2).
2 citations