Chitin‐decomposing actinomycetes associated with a vesicular–arbuscular mycorrhizal fungus from a calcareous soil

Ames, R. N.; Mihara, Kazuhiro; Bayne, H. G.

doi:10.1111/j.1469-8137.1989.tb04219.x

Cited by 45 publications

(18 citation statements)

References 12 publications

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“…Bars (in micrometers): A and B, 50; C, 100; D, E, F, and G, 10; H and I, 1. (2) found that out of 190 spores examined, 100 were colonized by one or more chitin-decomposing microorganisms; 82% were colonized by actinomycetes, 17% by bacteria, and 1% by fungi. Carpenter-Boggs et al (7) demonstrated a positive correlation between higher germination rate and the amount of production of geosmin, CO 2 , and 2-methylisoborneol by the actinomycetes.…”

Section: Discussionmentioning

confidence: 99%

“…Indeed, some bacterial populations, called mycorrhiza helper bacteria, have beneficial effects on AMF growth not only by improving mycorrhizal root colonization and stimulating extraradical hyphal growth but also by facilitating AMF spore germination (11,12). The latter effect has been shown for Actinomycetes (2,7,22), Pseudomonas and Corynebacterium (21), and Bacillus (38) spp.…”

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confidence: 95%

“…The role of AMF sporeassociated bacteria is not clear. They could stimulate spore germination by eroding spore walls (9,19), by producing stimulatory compounds such as CO 2 and other volatiles (7), or by influencing AMF phosphorus acquisition (30). Root exudation could enhance spore germination by stimulating the growth of bacteria beneficial for AMF (21).…”

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confidence: 99%

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Bacteria Associated with Spores of the Arbuscular Mycorrhizal Fungi Glomus geosporum and Glomus constrictum

Roesti

Ineichen

Braissant

et al. 2005

Appl Environ Microbiol

125

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Spores of the arbuscular mycorrhizal fungi (AMF) Glomus geosporum and Glomus constrictum were harvested from single-spore-derived pot cultures with either Plantago lanceolata or Hieracium pilosella as host plants. PCR-denaturing gradient gel electrophoresis analysis revealed that the bacterial communities associated with the spores depended more on AMF than host plant identity. The composition of the bacterial populations linked to the spores could be predominantly influenced by a specific spore wall composition or AMF exudate rather than by specific root exudates. The majority of the bacterial sequences that were common to both G. geosporum and G. constrictum spores were affiliated with taxonomic groups known to degrade biopolymers (Cellvibrio, Chondromyces, Flexibacter, Lysobacter, and Pseudomonas). Scanning electron microscopy of G. geosporum spores revealed that these bacteria are possibly feeding on the outer hyaline spore layer. The process of maturation and eventual germination of AMF spores might then benefit from the activity of the surface microorganisms degrading the outer hyaline wall layer.

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Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 95%

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Bacteria Associated with Spores of the Arbuscular Mycorrhizal Fungi Glomus geosporum and Glomus constrictum

Roesti

Ineichen

Braissant

et al. 2005

Appl Environ Microbiol

125

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“…Since the 1970s, certain microorganisms, particularly bacteria, have been observed to live in close association with AMF. These bacteria are living on the surface of (or among) fungal spores and hyphae (Ames et al 1989;Andrade et al 1998), in the spore wall (Macdonald and Chandler 1981;Walley and Germida 1996), and even inside the fungal cytoplasm (Bianciotto et al 1996). Several of these bacteria have beneficial effects on the performance of AMF, including the promotion of fungal spore germination (Mayo et al 1986;Xavier and Germida 2003) and hyphal growth (Hildebrandt et al 2002), the colonization of roots (Mamatha et al 2002), and even the formation of new fertile spores independent of the host plant (Hildebrandt et al 2002;Hildebrandt et al 2006).…”

Section: Introductionmentioning

confidence: 98%

Analysis of bacterial communities associated with spores of Gigaspora margarita and Gigaspora rosea

et al. 2008

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The spores of arbuscular mycorrhizal fungi (AMF) form a unique microhabitat that is suitable for the colonization by many species of bacteria. The aim of the current study was to analyze the bacterial communities associated with the surface of spores of the AMF species Gigaspora margarita MAFF 520054 and Gigaspora rosea JP1. The two AMF species were propagated with tobacco (Nicotiana tabacum) grown in a mixture of sand and soil. In another experiment, G. margarita was propagated with tobacco or alfalfa (Medicago sativa) grown in vermiculite or a mixture of sand and soil. The bacterial community composition of the new-formed spores and sand/soil substrate was analyzed using PCR of 16S rDNA fragments and denaturing gradient gel electrophoresis (DGGE). Clustering analysis revealed that the bacterial communities on the surface of G. margarita spores was different form that in the substrate or on the surface of the G. rosea spores, and both the host plant and the substrate could influence the composition of spore-associated bacterial populations of the G. margarita. Sequence analysis of the major DGGE bands of G. margarita spore samples revealed that most of the bacterial sequences were affiliated with the phyla Proteobacteria (Azospirillum,

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“…Actinobacteria were often found to be associated with AMF spores. Mugnier and Mosse (1987) reported that G. mosseae spores germinated in vitro only in the presence of microorganisms, including Streptomyces orientalis and Ames et al (1989) found that out of 190 spores examined, 100 were colonized by one or more chitin-decomposing microorganisms; 82% were colonized by actinomycetes, 17% by bacteria, and 1% by fungi. Actinomycetes found from the rhizosphere of field grown plants Trifolium repens L. (Franco-Correa et al, 2010) was able to improve plant growth and nutrition, and benefit root colonization by AM fungi.…”

Section: Introductionmentioning

confidence: 99%

Impact of arbuscular mycorrhizal fungus, Glomus intraradices, Streptomyces and Pseudomonas spp. strain on finger millet (Eleusine coracana L.) cv Korchara under water deficit condition

Kamal¹,

Gusain²,

Sharma³

et al. 2015

Afr. J. Biotechnol.

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Impact of arbuscular mycorrhizal fungus,In present study, a total of 104 bacteria and 96 actinomycetes were isolated from rhizosphere plant root of finger millet (Eleusine coracana) from Almora district of Uttarakhand, India. Isolates were characterized using microscopic and morphological methods followed by their biochemical test. Based on functional tests, four most promising isolates were identified using 23S rDNA primers as Streptomyces labedae (SB-9), Streptomyces flavofuscus (SA-11), and 16S rDNA primers as Pseudomonas poae (KA-5), and Pseudomonas fluorescens (KB-7). Influence of Glomus intraradices (G.I.) singly and along with actinomycetes and Pseudomonas spp. were evaluated under irrigated and water deficit conditions. Out of eight treatments studied in this study, a higher significant increase in plant height with S. labedae SB-9 + G.I and P. poae KA-5 + G.I were recorded. In well watered and water deficient conditions, maximum shoot dry matter content was recorded in P. Poae + P. flurosence + G.I and S. labedae + S. flavofuscus + G.I inoculated plants in comparison to their respective control. Under in vitro condition, P. poae KA-5 produced higher amount of indole acetic acid (IAA) among the selected isolates. Anti-oxidant enzyme, superoxide dismutase (SOD) and accumulation of free proline content in leaves were maximum in P. Poae + G.I inoculated plants under water deficit condition. In the presence of Streptomyces and Pseudomonas spp. a better mycorrhizal infection was observed in treated plant roots. This investigation support mutual symbiosis of Streptomyces and Pseudomonas strains with G. intraracides which had synergic effect on finger millet cv. Korchara plant under irrigated as well as under water stress condition.

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Chitin‐decomposing actinomycetes associated with a vesicular–arbuscular mycorrhizal fungus from a calcareous soil

Cited by 45 publications

References 12 publications

Bacteria Associated with Spores of the Arbuscular Mycorrhizal Fungi Glomus geosporum and Glomus constrictum

Bacteria Associated with Spores of the Arbuscular Mycorrhizal Fungi Glomus geosporum and Glomus constrictum

Analysis of bacterial communities associated with spores of Gigaspora margarita and Gigaspora rosea

Impact of arbuscular mycorrhizal fungus, Glomus intraradices, Streptomyces and Pseudomonas spp. strain on finger millet (Eleusine coracana L.) cv Korchara under water deficit condition

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