Effect of bacteria isolated from composts and macrofauna on sorghum growth and mycorrhizal colonization

Hameeda, Bee; Srijana, M.; Rupela, O P; Reddy, Gopal

doi:10.1007/s11274-006-9301-7

Cited by 42 publications

(35 citation statements)

References 17 publications

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“…Some soil microorganisms, particularly fungi, can cause seed decay, damping-off and root rots of sorghum seedlings (Forbes and Odvody 2000). On the other hand, beneficial microorganisms, fungi and bacteria, could provide protection (Hameeda et al 2007). Therefore, examination of how different sorghum genotypes can modify populations of fungi and oomycetes, and bacteria may provide understanding of a mechanism of protection for young sorghum plants.…”

Section: Discussionmentioning

confidence: 99%

Effect of sorghum seedlings, and previous crop, on soil fluorescent Pseudomonas spp.

2008

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Hypotheses in which sorghum seedlings [Sorghum bicolor (L.) Moench] of different genotypes will differentially modify soil microorganisms and will affect subsequent planting of wheat (Triticum aestivum L.) seedlings, were tested. Wheat cultivar Lewjain, and sorghum genotypes Redlan and RTx433, were planted into soils previously planted with wheat or sorghum in growth chamber experiments. Total culturable fungi and oomycetes, and fluorescent Pseudomonas spp. numbers (cfu) were determined. Pseudomonads were screened for hydrogen cyanide (HCN) production, for the presence of the phlD gene for 2,4-diacetylphloroglucinol production (Phl) and for a region of the operon involved in phenazine-1-carboxylic acid (PCA) production. Pasteurized soils were inoculated with rifampicin-marked strains of Pseudomonas fluorescens then planted with Lewjain, Redlan and RTx433 to assess rhizosphere and soil colonization. Effects of plant species, sorghum genotype and previous crop on culturable fungi and oomycetes, and pseudomonad numbers (cfu g −1 soil) were statistically significant. Soils planted with RTx433 or Lewjain had greater numbers of fungal cfu than soils planted with Redlan. When Lewjain seedlings were grown in soil previously planted with RTx433, there were greater numbers of fungal cfu than when Lewjain was planted into Redlan soil. Wheat planted into wheat soil resulted in statistically significantly fewer numbers of pseudomonads than when planted into sorghum soil. Overall, percentages of HCN-producing pseudomonads increased, especially when wheat seedlings were planted in wheat soil. For most treatments, percent of isolates with Phl declined, except when Redlan was planted into Redlan soil, which resulted in increased Phl isolates. When rifampicin-marked P. fluorescens isolates were applied to pasteurized soil, sorghum seedlings sustained rhizosphere and soil populations similar to those on wheat. Sorghum genotypes may differ in associations with soil microorganisms, Plant Soil

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Section: Discussionmentioning

confidence: 99%

Effect of sorghum seedlings, and previous crop, on soil fluorescent Pseudomonas spp.

2008

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“…Hameeda et al (2007) observaram que a utilização de palha de arroz e vermicomposto de palha de arroz como adubos orgânicos nas quantidades de 5 e 10 toneladas por hectares, respectivamente não proporcionaram inibição da CM, porém resultou na redução da matéria seca das plantas, em relação às plantas não inoculadas. As divergências observadas nos diversos estudos podem ser justificadas pela elevada variabilidade na composição dos adubos orgânicos, pois materiais orgânicos pobres em nutrientes podem estimular a CM e os ricos podem inibir (BUCHER, 2007) (LEAKE et al, 2004).…”

Section: Methodsunclassified

Colonização micorrízica e nodulação radicular em mudas de sabiá (Mimosa caesalpiniaefolia Benth.) sob diferentes níveis de salinidade

Tavares¹,

Filho²,

Lacerda³

et al. 2012

Rev. Ciênc. Agron.

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), com 3 repetições. Os resultados obtidos indicam que: a salinidade reduziu a colonização micorrízica e a nodulação radicular das mudas de sabiá; a intensificação das condições de estresse salino aumentaram a dependência micorrízica das mudas de sabiá; a colonização das mudas de sabiá com os FMAs proporcionou aumentos na matéria seca dos nódulos radiculares da ordem de 1900%; as micorrizas arbusculares reduziram o pH após o cultivo do solo; e a adição de vermicomposto não promoveu efeito sobre a colonização micorrízica das mudas de sabiá, entretanto, aumentou a produção de matéria seca dos nódulos radiculares. Palavras-chave: Sabiá (árvore). Salinidade. Microssimbiontes.ABSTRACT -The sabiá (Mimosa caesalpiniaefolia Benth.) is a plant species native to the Brazilian northeast and brings together some fundamental features for use in rehabilitation programs of salinized areas, especially if associated with arbuscular mycorrhizal fungi (AMF) and nitrogen-fixing bacteria (BFN). The aim of this study was to evaluate the mycorrhizal colonization and root nodulation of sabiá seedlings fertilized with organic compost and irrigated with water at different electrical conductivities. The experiment was carried out in a greenhouse, in a completely randomized design with a factorial scheme of 2 (presence and absence of arbuscular mycorrhizal fungi) x 2 (presence and absence of an organic compound) x 5 levels of electrical conductivity of the irrigation water (0.7, 1.2, 2.2, 3.2 and 4.2 dS m -1 ), and three repetitions. The results obtained indicate that: salinity reduced mycorrhizal colonization and root nodulation of the sabiá seedlings; intensifying salt-stress conditions increased the mycorrhizal dependence of the sabiá seedlings; the colonization of seedlings with AMF caused increases in the root-nodule dry matter of about 1900%; the arbuscular mycorrhiza reduced the pH after soil cultivation; and the addition of vermicompost had no effect on the mycorrhizal colonization of the sabiá seedlings, but did increase the production of root-nodule dry matter.

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“…Synergistic positive interactions between AM fungi and PGPR, such as nitrogen fixers, fluorescent Pseudomonads and sporulating bacilli, have been documented by many researchers (Galleguillos et al, 2000;Hameeda et al, 2007), although some neutral effects of AM fungi and PGPR interaction have also been reported (Andrade et al, 1997;Walley and Germida, 1997).…”

Section: Introductionmentioning

confidence: 99%

Effect of <i>Bacillus velezensis</i> and <i>Glomus intraradices</i> on Fruit Quality and Growth Parameters in Strawberry Soilless Growing System

et al. 2015

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This study evaluates the effect on the 'Splendor' and 'Primoris' strawberry cultivars of different dates of inoculation with Glomus intraradices, an arbuscular mycorrhizal (AM) fungus. Additionally, plants were grown in a soilless growing system with or without Bacillus velezensis at the beginning of the experiment. A completely randomized block design (2 biofertilizer treatments × 2 cultivars × 3 inoculation dates) with 2 replications was used. Each replicate consisted of one bag with 10 plants. Fruit weight, fruit quality, growth parameters, and SPAD values in young leaves were monitored from October 2011 to June 2012 in a greenhouse. At the end of the crop cycle, the microbial population of Bacillus spp. and the Glomus intraradices population were determined from the rhizosphere of the plant. Bacillus velezensis and Glomus intraradices were established in the strawberry soilless growing system. The effect of arbuscular mycorrhizae on strawberry fruit quality was more important than that on growth parameters. Biofertilizer with arbuscular mycorrhizal fungi had an inhibitory effect on fruit quality, as indicated by low TSS, pH, and TA values. The combined effect of the biofertilizer and inoculation dates of Glomus intraradices on growth parameters was more significant in the 'Primoris' cultivar than in 'Splendor'. In both cultivars, an increase in SPAD values was observed from week 12 to week 22 after planting. Depending on the cultivar selected, the date of inoculation may significantly affect plant response to AM fungal colonization in a soilless growing system.

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Effect of bacteria isolated from composts and macrofauna on sorghum growth and mycorrhizal colonization

Cited by 42 publications

References 17 publications

Effect of sorghum seedlings, and previous crop, on soil fluorescent Pseudomonas spp.

Effect of sorghum seedlings, and previous crop, on soil fluorescent Pseudomonas spp.

Colonização micorrízica e nodulação radicular em mudas de sabiá (Mimosa caesalpiniaefolia Benth.) sob diferentes níveis de salinidade

Effect of <i>Bacillus velezensis</i> and <i>Glomus intraradices</i> on Fruit Quality and Growth Parameters in Strawberry Soilless Growing System

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