Effect of Soil Actinomycetes on Strains of <i>Rhizobium japonicum</i><sup>1</sup>

Damirgi, Salih M.; Johnson, Herbett W.

doi:10.2134/agronj1966.00021962005800020032x

Cited by 22 publications

(6 citation statements)

References 4 publications

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“…The presence of antagonistic microflora has been postulated to affect the outcome of competition between strains of rhizobia. Although some studies show that inhibition of Rhizobium by soil microorganisms may occur under laboratory conditions, the presence of inhibitory microorganisms in the legume rhizosphere (in soil) has little effect on the nodulating ability of strains of rhizobia (9,12,25). In this study, the outcome of competition between R. japonicum strains USDA 110 and USDA 123 was not affected by the presence of antagonistic microorganisms in the soybean rhizosphere ( Table 2).…”

Section: Discussionmentioning

confidence: 52%

“…Nodulating abilities of R. leguminosarum (20), R. meliloti (26), and R. japonicum (10, 21) were also affected by the host cultivar. Changes in nodule occupancy over successive harvest times by strains of R. japonicum have also been reported (9).…”

Section: Discussionmentioning

confidence: 87%

“…The competitive success of USDA 123 was not found to be related to its ability to colonize the root surfaces of fieldgrown soybeans (22). The susceptibility of USDA 123 to antimicrobial activity in soil was also negligible (9).…”

mentioning

confidence: 89%

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Influence of Environmental Factors on Interstrain Competition in Rhizobium japonicum

Kosslak

Bohlool

1985

Appl Environ Microbiol

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The effect of several biotic and abiotic factors on the pattern of competition between two strains of Rhizobium japonicum was examined. In two Minnesota soils, Waseca and Waukegan, strain USDA 123 occupied 69% (Waseca) and 24% (Waukegan) of the root nodules on Glycine max L. Merrill cv. Chippewa. USDA 110 occupied 2% of the root nodules in the Waseca soil and 12% of the nodules in the Waukegan soil. Under a variety of other growth conditions-vermiculite, vermiculite amended with Waseca soil, and two Hawaiian soils devoid of naturalized Rhizobium japonicum strains-USDA 110 was more competitive than USDA 123. The addition of nitrate to or the presence of antibiotic-producing actinomycetes in the rhizosphere of soybeans did not affect the pattern of competition between the two strains. However, preexposure of young seedlings to USDA 110 or USDA 123 before transplantation into soil altered the pattern of competition between the two strains significantly. In the Waseca soil, preexposure of cv. Chippewa to USDA 110 for 72 h increased the percentage of nodules occupied by USDA 110 from 2 to 55%. Similarly, in the Hawaiian soil Waimea, nodule occupancy by USDA 123 increased from 7 to 33% after a 72-h preexposure.

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Section: Discussionmentioning

confidence: 52%

Section: Discussionmentioning

confidence: 87%

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Influence of Environmental Factors on Interstrain Competition in Rhizobium japonicum

Kosslak

Bohlool

1985

Appl Environ Microbiol

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“…Actinomycetes, which are resident microflora of the rhizospheres of a number of legumes, are known to inhibit rhizobia (1,3,(4)(5)(6) and cause unsuccessful nodulation in the field (2,11). Several kinds of microflora, including fungi, occur on the surface of nodules, which may affect the development of nodules and the fixation of nitrogen by bacteroids at the postinfection stage (8).…”

mentioning

confidence: 99%

Occurrence of a Lysogenic Streptomyces sp. on the Nodule Surface of Black Gram ( Vigna mungo (L.) Hepper)

Rangarajan

Ravindran

Hariharan

1984

Appl Environ Microbiol

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A lysogenic Streptomyces sp., strain NS.A4, which was isolated from the nodule surface of black gram (Vigna mungo (L.) Hepper), was found to inhibit rhizobia of fastand slow-growing strains of cowpeas and soybeans. It exhibited plaques when there was a change in cultural conditions. Repeated culturing of the organism in nutrient agar and broth confirmed the infection of Streptomyces sp. strain NS.A4 by an actinophage. Addition of the culture filtrate of Streptomyces sp. strain NS.A4 to shaken broth cultures of three other Streptomyces spp. resulted in phage infection.

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“…Field isolates of various actinomycetes influence some japonicum strains under laboratory conditions but their importance in the field is poorly understood (Damirgi and Johnson, 1966;. Fuhrmann and Wollum (1986) Smith and Miller (1974).…”

Section: Inoculationmentioning

confidence: 99%

Competition of bradyrhizobia in Iowa soils

Berg

Roland)²

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INTRODUCTION 106 MATERIALS AND METHODS Soils Sampling Procedure Nodule Isolates Isolation Physiological testing 113 Environmental stress Plant infection cest 113 RESULTS AND DISCUSSION Nodule Serology 115 Physiological Testing 119 Environmental stress 119 pH 119 Temperature 119 NaCl 119 1 GENERAL THTRODUCTION Soybean productivity can be greatly enhanced by inoculation of seeds in soils that lack bradyrhizobia. In soils with established populations, however, the competition between native and added bradyrhizobia is thought to be a major factor that inhibits inoculation responses and successful establishment of more desirable inoculum strains. Research is needed to better understand bradyrhizobial competition and ecology in soil. These studies investigated factors affecting competition between native and introduced Bradyrhizobium japonicum in Iowa soils. The first section entitled "Literature review" outlined and summarized previous research. This section contains Introduction, Competition, Fertility, Field Surveys, Methodology, and References Cited subsections and includes tables within the text. This manuscript will not be submitted for publication. The second section entitled "Competition of introduced Bradyrhizobium japonicum in Iowa soils" evaluated the competitiveness of inoculum strains in field studies over a 3-yr period to determine if introduced strains could compete against native bradyrhizobia in forming nodules on soybeans and, if so, whether their presence in the nodules contributed to improved plant growth. This section contains Abstract, Introduction, Materials and Methods, Results and Discussion, Summary, and References Cited subsections and has tables and a figure included in the text. This manuscript will be submitted to Agronomy Journal for publication. 2-4 The third section entitled "Serology of bradyrhizobia in Iowa soybean nodules as influenced by N additions and cultivars" considered N fertilizer, cultivars, and commercial inoculum as management factors that may affect the presence of bradyrhizobial serogroups in soybean nodules in the field. This section has the same subsection format as Section 2, except that Section 3 does not have a Summary. Tables are also included in the text. It has not been decided at the time of printing if this section will be submitted for publication. The fourth section is entitled "Field survey of soybean bradyrhizobia in Iowa soils" and characterized serogroups of native bradyrhizobia in field-grown soybean nodules from 32 soils across central Iowa over a 3-yr period. Nodule isolates were evaluated for a) tolerance to environmental stresses of pH, temperature, and salt concentrations, and b) their nodulation and Ng-fixation efficiency under laboratory conditions. This section has the same subsection format as Section 2 and has tables included in the text. It has not been decided at the time of printing if this section will be submitted for publication. An overall summary and discussion of results follows these sections in "Summary and Conclusions." Appendices A...

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Effect of Soil Actinomycetes on Strains of Rhizobium japonicum¹

Cited by 22 publications

References 4 publications

Influence of Environmental Factors on Interstrain Competition in Rhizobium japonicum

Influence of Environmental Factors on Interstrain Competition in Rhizobium japonicum

Occurrence of a Lysogenic Streptomyces sp. on the Nodule Surface of Black Gram ( Vigna mungo (L.) Hepper)

Competition of bradyrhizobia in Iowa soils

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Effect of Soil Actinomycetes on Strains of Rhizobium japonicum1

Cited by 22 publications

References 4 publications

Influence of Environmental Factors on Interstrain Competition in Rhizobium japonicum

Influence of Environmental Factors on Interstrain Competition in Rhizobium japonicum

Occurrence of a Lysogenic Streptomyces sp. on the Nodule Surface of Black Gram ( Vigna mungo (L.) Hepper)

Competition of bradyrhizobia in Iowa soils

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Effect of Soil Actinomycetes on Strains of Rhizobium japonicum¹