Ferrous Complexes and Chelating Compounds in Suppression of Fungal Diseases of Cereals

Brown, Averil E.

doi:10.1007/978-1-4615-9480-2_24

Cited by 3 publications

(2 citation statements)

References 19 publications

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“…It is also possible that the ' helper bacteria ' assist in a more direct way : they could promote the adhesion of the fungal spores to the leaf surface by providing a mechanical or chemical bridge ; increase the rate of germination (Mosse,1962 ;Ali & Jackson, 1989) ; or promote mycelial growth as MHBs did with the ectomycorrhizal fungus Laccaria laccata (Duponnois, 1992). Some species of Pseudomonas are known to produce siderophores which are important in the establishment of some fungal infections (Slade et al, 1986 ;Swinburne, 1986 ;Fernando et al, 1996) but Brown (1986) found this not to be the case in detached leaf pathogenicity tests with S. nodorum. However, those bacteria that we isolated with S. nodorum that had the greatest enhancing effect were not species of Pseudomonas.…”

Section: mentioning

confidence: 99%

Bacteria associated with Stagonospora (Septoria) nodorum increase pathogenicity of the fungus

et al. 1999

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In studies with a laboratory isolate of the fungal pathogen Stagonospora (Septoria) nodorum three different isolates of bacteria were closely associated with the fungus. Bacteria were also closely associated with fresh isolates of S. nodorum obtained from artificially and naturally infected field material. Although a range of bacteria was isolated, only one type of bacterium was found to be associated with each isolate of S. nodorum. In co-inoculation studies with pycnidiospores of the fungus on detached leaves, some of the bacterial isolates significantly increased the pathogenicity of the fungus, particularly Xanthomonas maltophilia, Sphingobacterium multivorum, Enterobacter agglomerans and Erwinia amylovora. Evidence is presented indicating that one of the ways that the ' helper bacteria ' may assist in the establishment of infections is by the production of lipases that were not detected in germinating fungal spores.

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Section: mentioning

confidence: 99%

Bacteria associated with Stagonospora (Septoria) nodorum increase pathogenicity of the fungus

et al. 1999

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“…Ferrous iron assay. Fraction Cl (100 IlI) was added to 600 ,ul of a 5 mM solution of 2,2'-dipyridyl (strong ferrous iron chelator at acid pH [8]) resulting in a final pH of <3.0. The A420 and A550 were measured after 3 min.…”

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Identification of an additional ferric-siderophore uptake gene clustered with receptor, biosynthesis, and fur-like regulatory genes in fluorescent Pseudomonas sp. strain M114

O’Sullivan

Morris

O’Gara

1990

Appl Environ Microbiol

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Five cosmid clones with insert sizes averaging 22.6 kilobases (kb) were isolated after complementation of 22 TnS-induced Sidmutants of Pseudomonas sp. strain M114. One of these plasmids (pMS639) was also shown to encode ferric-siderophore receptor and dissociation functions. The receptor gene was located on this plasmid since introduction of the plasmid into three wild-type fluorescent pseudomonads enabled them to utilize the ferric-siderophore from strain M114. The presence of an extra iron-regulated protein in the outer membrane proffle of one of these strains was detected by sodium dodecyl sulfate-polyacrylamide gel electrophoresis. A ferric-siderophore dissociation gene was attributed to pMS639 since it complemented the ferric-siderophore uptake mutation in strain M114FR2. This mutant was not defective in the outer membrane receptor for ferric-siderophore but apparently accumulated ferric-siderophore internally. Since ferric-citrate alleviated the iron stress of the mutant, there was no defect in iron metabolism subsequent to release of iron from the ferric-siderophore complex. Consequently, this mutant was defective in ferric-siderophore dissociation. A fur-like regulatory gene also present on pMS639 was subcloned to a 7.0-kb BgllI insert of pCUP5 and was located-7.3 kb from the receptor region. These results established that the 27.2-kb insert of pMS639 encoded at least two siderophore biosynthesis genes, ferric-siderophore receptor and dissociation genes, and afur-like regulatory gene from the biocontrol fluorescent Pseudomonas sp. strain M114.

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Iron status of crops in Prince Edward Island and effect of soil pH on plant iron concentration

Gupta¹

1991

Can. J. Soil. Sci.

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Field studies were conducted in Prince Edward Island (PEI) on the Fe nutrition of cereals and forages and to determine the relationship between plant Fe and soil pH. The Fe concentration in barley (Hordeum vulgare L.) and oats (Avena sativa L.) boot stage tissue (BST) and grain ranged from 35 to 65 and from 19 to 42 mg kg−1, respectively, in the control and from 38 to 57 and from 22 to 45 mg kg−1, respectively, in the soil applied Fe treatments. In the foliar applied Fe treatments, the cereal BST contained as much as 121 mg Fe kg−1 in the FeSO4.7H2O treatments and up to 86 mg kg−1 in the chelate-Fe treatment, but neither of these two sources increased Fe concentration in the grain. In the first cut of forages in the foliar treatments, the Fe was as high as 131 mg Fe kg−1, but no differences were generally found between the control and Fe treatments in the second cut. Over the soil pH ranges of 4.5–6.9, no consistency was found in the correlation coefficient (r) values between plant Fe and soil pH. In spite of the Fe concentrations as low as 19 mg kg−1 in cereal grain and 23 mg kg−1 in forages in the control treatments, no yield response to added Fe was found. However, the Fe concentrations as found in this study would be considered deficient for livestock and mineral supplements of Fe to the feeds may be desirable. Key words: Cereals, forages, soil pH, plant iron, acid soils

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Ferrous Complexes and Chelating Compounds in Suppression of Fungal Diseases of Cereals

Cited by 3 publications

References 19 publications

Bacteria associated with Stagonospora (Septoria) nodorum increase pathogenicity of the fungus

Bacteria associated with Stagonospora (Septoria) nodorum increase pathogenicity of the fungus

Identification of an additional ferric-siderophore uptake gene clustered with receptor, biosynthesis, and fur-like regulatory genes in fluorescent Pseudomonas sp. strain M114

Iron status of crops in Prince Edward Island and effect of soil pH on plant iron concentration

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