Interaction among free-living N-fixing bacteria isolated from Drosera villosa var. villosa and AM fungi (Glomus clarum) in rice (Oryza sativa)

Raimam, Milena Pupo; Albino, Ulisses Brigatto; Cruz, Marcio Ferreira; Lovato, Gisele Milani; Spago, Flávia Regina; Ferracin, T.P.; Lima, D.S.; Goulart, Thais Marchi; Bernardi, Caliandra; Miyauchi, Marina Yumi Horta; Nogueira, Marco Antônio; Andrade, Galdino

doi:10.1016/j.apsoil.2006.05.013

Cited by 40 publications

(30 citation statements)

References 23 publications

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“…One option that is attracting much attention concerns the possibility of creating new combinations of beneficial micro-organisms with complementary modes of action. In the last few years, several reports have shown that co-inoculation of beneficial microorganisms could stimulate plant growth and/or increase plant disease resistance relative to inoculation with a single biocontrol agent (Raimam et al, 2007;Whipps, 2004). Although such combinations may enhance the level of plant protection against pathogen attack (Ezziyyani et al, 2007;Guetsky et al, 2001Guetsky et al, , 2002, the possible competitiveness between these micro-organisms has to be taken into consideration (Alabouvette et al, 2006).…”

Section: Interaction With Other Biocontrol Agentsmentioning

confidence: 99%

Pythium oligandrum: an example of opportunistic success

et al. 2012

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Pythium oligandrum, a non-pathogenic soil-inhabiting oomycete, colonizes the root ecosystem of many crop species. Whereas most members in the genus Pythium are plant pathogens, P. oligandrum distinguishes itself from the pathogenic species by its ability to protect plants from biotic stresses in addition to promoting plant growth. The success of P. oligandrum at controlling soilborne pathogens is partly associated with direct antagonism mediated by mycoparasitism and antimicrobial compounds. Interestingly, P. oligandrum has evolved with specific mechanisms to attack its prey even when these belong to closely related species. Of particular relevance is the question of how P. oligandrum distinguishes between self-and non-self cell wall degradation during the mycoparasitic process of pathogenic oomycete species. The ability of P. oligandrum to enter and colonize the root system before rapidly degenerating is one of the most striking features that differentiate it from all other known biocontrol fungal agents. In spite of this atypical behaviour, P. oligandrum sensitizes the plant to defend itself through the production of at least two types of microbe-associated molecular patterns, including oligandrin and cell wall protein fractions, which appear to be closely involved in the early events preceding activation of the jasmonic acid-and ethylene-dependent signalling pathways and subsequent localized and systemic induced resistance. The aim of this review is to highlight the expanding knowledge of the mechanisms by which P. oligandrum provides beneficial effects to plants and to explore the potential use of this oomycete or its metabolites as new disease management strategies.

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Section: Interaction With Other Biocontrol Agentsmentioning

confidence: 99%

Pythium oligandrum: an example of opportunistic success

et al. 2012

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“…The other genotypes showed unlike responses, depending on the bacteria, what may be attributed to the specificity between the plant genotype and the bacterial inoculum (Baldani et al, 1997;Dobbelaere et al, 2003;Perin et al, 2003;Raimam et al, 2007). Positive response of the hybrid AS3466 to Burkholderia sp.…”

Section: Resultsmentioning

confidence: 99%

“…Some soilborne microorganisms may improve plant growth via hormonal and/or nutritional effects, as do some diazotrophic bacteria (Perin et al, 2003;Raimam et al, 2007) and arbuscular mycorrhizal fungi (AMF). Some species of the genus Azospirillum, besides fixing nitrogen, may also stimulate plant growth by means of phytohormones (Reis-Júnior et al, 2004).…”

Section: Introductionmentioning

confidence: 99%

Interactions between diazotrophic bacteria and mycorrhizal fungus in maize genotypes

Miyauchi

Lima

Nogueira

et al. 2008

Sci. agric. (Piracicaba, Braz.)

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Some diazotrophic bacteria can fix nitrogen biologically in gramineous host plants. Generally, gramineous plants are also associated with mycorrhizal fungi, that can improve mainly plant P uptake. Among the factors affecting plant-microbe interactions, the plant genotype plays an important role. This study evaluates the effect of diazotrophic bacteria and an arbuscular mycorrhizal fungus (AMF), on five genotypes of maize (Zea mays L.), in relation to plant biomass, shoot N and P concentrations, and fine root morphological traits. The experimental design was entirely randomized in a factorial 5 × 4 × 2 arrangement, i.e., five maize genotypes (hybrids C333B, AS3466, and PREMIUM, and the inbreed lines lg40897-1 and lg40505-1), three diazotrophic bacteria (Azospirillum lipoferum, A. amazonense, and Burkholderia sp.) in addition to a control without bacterial inoculation, co-inoculated or not with the AMF Glomus clarum. The non-mycorrhizal plants inoculated with Azospirillum exhibited the highest N concentrations. The lines lg40897-1 and lg40505-1 showed higher P concentrations as compared to the hybrids, mainly when colonized by AMF. The higher levels of mycorrhizal colonization (90%) occurred in the C333B and lg40897-1 genotypes, which also exhibited a greater root diameter. Mycorrhiza increased shoot and root biomass, besides root traits as total length, specific length, total surface, and incidence of root hairs in all genotypes. In addition, mycorrhiza also stimulated the root colonization by diazotrophic bacteria. The bacteria did not affect root morphological traits and mycorrhizal colonization. Key words: Azospirillum, biological nitrogen fixation, mycorrhiza, root morphology INTERAÇÕES ENTRE BACTÉRIAS DIAZOTRÓFICAS E FUNGO MICORRÍZICO EM GENÓTIPOS DE MILHORESUMO: Algumas bactérias diazotróficas podem fixar N biologicamente em gramíneas, as quais se associam a fungos micorrízicos, o que pode levar a um aumento principalmente da absorção de P. Dentre os fatores que afetam as interações planta-microrganismos, o genótipo da planta tem importante papel. Esse trabalho avalia o efeito de bactérias diazotróficas e de um fungo micorrízico arbuscular (FMA) em cinco genótipos de milho (Zea mays L.), em relação à biomassa das plantas, teores de N e P na parte aérea e parâmetros relacionados à morfologia das raízes finas. O delineamento experimental foi inteiramente casualizado, em arranjo fatorial 5 × 4 × 2, sendo cinco genótipos de milho (híbridos C333B, AS3466, PREMIUM e as linhagens lg40897-1 e lg40505-1), três bactérias diazotróficas (Azospirillum lipoferum, A. amazonense e Burkholderia sp.), mais um controle sem bactéria, coinoculadas ou não com o FMA Glomus clarum. As plantas sem FMA e inoculadas com Azospirillum apresentaram os maiores teores de N. As linhagens lg40897-1 e lg40505-1 apresentaram maior concentração de P em relação aos híbridos, principalmente quando micorrizadas. Os maiores níveis de colonização micorrízica (90%) ocorreram nos genótipos C333B e lg40897-1 que, por sua vez, apresentaram ma...

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“…A biomassa da raiz e da parte aérea e a razão raiz/parte aérea não diferiram entre os tratamentos. O peso seco das raízes variou de 0,40 a 1,36 g entre os tratamentos, enquanto que o peso seco da parte aérea variou de 0,6 até 2 g. CARDOSO, 1991;RAIMAM et al, 2007), tal fato também pode ter acontecido no presente experimento.…”

Section: Resultsunclassified

“…A colonização pelo FMA na maioria dos casos foi considerada alta e é considerada adequada e semelhante ao que comumente é encontrado em estudos de inoculação com plantas de arroz (RAIMAM et al, 2007;MOLTOCARO, 2007;VALLINO et al, 2014). Já para os DSE, a porcentagem de colonização radicular foi baixa e pode ter sido responsável pela ausência de efeitos dos DSE no desenvolvimento das plantas.…”

Section: Resultsunclassified

Fungos micorrízicos arbusculares e endofíticos dark septate em áreas de Mata Atlântica em um gradiente altitudinal

Bonfim¹

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Interaction among free-living N-fixing bacteria isolated from Drosera villosa var. villosa and AM fungi (Glomus clarum) in rice (Oryza sativa)

Cited by 40 publications

References 23 publications

Pythium oligandrum: an example of opportunistic success

Pythium oligandrum: an example of opportunistic success

Interactions between diazotrophic bacteria and mycorrhizal fungus in maize genotypes

Fungos micorrízicos arbusculares e endofíticos dark septate em áreas de Mata Atlântica em um gradiente altitudinal

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