OCORRÊNCIA DE BACTÉRIAS DO GÊNERO Azospirillum spp. ASSOCIADAS A GRAMÍNEAS FORRAGEIRAS NO SEMIÁRIDO NORDESTINO

Moreira, Francisco Tibério de Alencar; Santos, Diércules Rodrigues dos; Silva, Girlânio Holanda; Alencar, Lyanne Santos

doi:10.15628/holos.2013.1043

Cited by 2 publications

(3 citation statements)

References 3 publications

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“…A baixa resposta observada no tratamento 100N-I pode estar relacionada as possíveis perdas significativas do N por volatilização da amônia e pela imobilização do N na matéria orgânica (ALVES et al, 2006). Já, a baixa resposta unicamente do tratamento somente com inoculação (0N+I), pode estar realcionada ao fato de que essa seria a fonte exclusiva de N, podendo não ser capaz de fixar biologicamente a quantidade necessária de N para alcançar ótimo desenvolvimento agronomico de plantas não-leguminosas (BALDANI et al, 1999;MOREIRA et al, 2013). Entretanto, esta condição não foi observada para resultados de REPKE et al (2013), onde apenas encontraram efeito isolado para doses de nitrogênio, afirmando que o uso de inoculante Azospirillum brasilense no híbrido 2B587 Hx de milho, não substitui o uso de fertilizantes nitrogenados e tampouco permite sua redução de dose.…”

Section: Resultsunclassified

Agronomic performance of out-of-season maize crop in response of application N-fertilizer combined with biological inoculant in Mato Grosso

Carmo¹,

Berber²,

Bourscheidt³

et al. 2020

Sci. Elec. Arch.

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The high price of nitrogen fertilizer is an aggravating factor for the corn production costs in the out season and its use may be lead environmental damages. Diazotrophic bacteria have the ability to associate with different plant species and nitrogen supply. Thus, the objective of this study was to evaluate the agronomic performance of winter maize inoculated with Azospirillum brasilense grown with nitrogen levels in the state of Mato Grosso. The experiment was carried out and scaled the field with six treatments: 42 kg N ha-1 with inoculant; 31.5 kg N ha-1 with inoculant; 21 kg N ha-1 with inoculant; 0 kg N with inoculant; 0 kg N without inoculation; 42 kg N ha-1 without inoculation. The inoculant tested contained two strains of A. brasilense. Nine variables were evaluated after harvest and the data were assessed by Kruskal-Wallis test (p ≤ 0.01) test. The variables productivity, number of rows of grains of corn, number of kernels per row, diameter spike, spike weight and weight of the cob responded positively to inoculation with 42 Kg of N. The variables mass of thousand grains, diameter of cob and weight of straw did not change according to the treatments. The productivity in the treatments with reduced N doses was equal to high N doses without inoculation. Those results showed the inoculant use associated with low N doses may be a new way to reduce the N use without decrease the corn productivity in the out season in Mato Grosso.

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Section: Resultsunclassified

Agronomic performance of out-of-season maize crop in response of application N-fertilizer combined with biological inoculant in Mato Grosso

Carmo¹,

Berber²,

Bourscheidt³

et al. 2020

Sci. Elec. Arch.

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“…Studies involving the selection of diazotrophic PGPB for forages have been conducted in vastly different regions of Brazil, including the mid-west (Reis Junior et al 2004;Brasil et al 2005;Souza et al 2017), south-east (dos Santos et al 2017) and northeast (dos Moreira et al 2013;Antunes et al 2017;da Silva et al 2018), indicating the effectiveness of prospective studies for locally adapted N 2 -fixing isolates.…”

Section: Introductionmentioning

confidence: 99%

“…Tanzânia) were previously obtained and phenotypically characterised from Patos, Paraíba State (dos . At the same location, Moreira et al (2013) isolated and characterised Azospirillum-like bacteria from the same plant species. Both studies characterised and evaluated the cultural diversity and seasonal fluctuation of diazotrophs but did not evaluate their molecular and plant growth-promotion abilities.…”

Section: Introductionmentioning

confidence: 99%

Associative diazotrophic bacteria from forage grasses in the Brazilian semi-arid region are effective plant growth promoters

et al. 2019

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The study of plant growth-promoting bacteria (PGPB) can identify outstanding bacteria for crops. For forage grasses adapted to drylands, the selection of PGPB can increase the field performance of pastures. The aim of this study was to isolate, and characterise at molecular, biochemical and symbiotic levels, diazotrophic bacteria obtained from buffel grass (Cenchrus ciliaris), sorghum (Sorghum bicolor) and Tifton 85 (Cynodon spp.) from Brazilian semi-arid region fields. Field-grown plants were collected, and the roots were surface-disinfected, crushed and inoculated in a semi-solid medium. After the formation and confirmation of microaerophilic pellicles, the bacteria were isolated and purified. All bacterial isolates were subjected to nifH gene amplification and identified by their partial 16S rRNA gene sequences. The bacteria were evaluated for the production of auxins and siderophores, calcium phosphate solubilisation, and diazotrophic ability as ‘in vitro’ plant growth-promotion traits. A plant inoculation assay was conducted to assess the plant growth-promotion abilities of the bacterial isolates. Twenty-one bacterial isolates harboured the nifH gene (nifH+), among which nine were obtained from sorghum, eight from buffel grass, and four from Tifton 85. The bacterial isolates were classified as Bacillus (8), Stenotrophomonas (7), Agrobacterium (4), Cellulomonas (1) and Paenibacillus (1). All were shown to be auxin producers, with 14 isolates showing diazotrophic capacity ‘in vitro’. Fourteen isolates increased plant N content, but the bacterial strains ESA 392 and ESA 398 (Bacillus), ESA 397 and ESA 407 (Stenotrophomonas), and ESA 401 (Agrobacterium) were shown to promote both plant growth and N nutrition. These strains are candidates for further assays to evaluate their agronomic performance under field conditions, aiming inoculant production for forage grasses in drylands.

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OCORRÊNCIA DE BACTÉRIAS DO GÊNERO Azospirillum spp. ASSOCIADAS A GRAMÍNEAS FORRAGEIRAS NO SEMIÁRIDO NORDESTINO

Cited by 2 publications

References 3 publications

Agronomic performance of out-of-season maize crop in response of application N-fertilizer combined with biological inoculant in Mato Grosso

Agronomic performance of out-of-season maize crop in response of application N-fertilizer combined with biological inoculant in Mato Grosso

Associative diazotrophic bacteria from forage grasses in the Brazilian semi-arid region are effective plant growth promoters

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