Ocorrência e efeito de bactérias diazotróficas em genótipos de trigo

Sala, Valéria Marino Rodrigues; Freitas, Sueli dos Santos; Donzeli, Vanessa Polon; Freitas, José Guilherme de; Gallo, Paulo Boller; Silveira, Adriana Parada Dias da

doi:10.1590/s0100-06832005000300004

Cited by 40 publications

(43 citation statements)

References 28 publications

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“…Although a variety of organisms are capable of nitrogen fixation, endophytes have an advantage over rhizobacteria. Their location inside the plant means that their habitat is protected, more uniform and with lower oxygen levels, favoring nitrogen fixation (Sala et al 2005).…”

Section: Resultsmentioning

confidence: 99%

Isolation and selection of plant growth-promoting bacteria associated with sugarcane

Rodrigues

Forzani

Soares

et al. 2016

Pesqui. Agropecu. Trop.

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Microorganisms play a vital role in maintaining soil fertility and plant health. They can act as biofertilizers and increase the resistance to biotic and abiotic stress. This study aimed at isolating and characterizing plant growth-promoting bacteria associated with sugarcane, as well as assessing their ability to promote plant growth. Endophytic bacteria from leaf, stem, root and rhizosphere were isolated from the RB 867515 commercial sugarcane variety and screened for indole acetic acid (IAA) production, ability to solubilize phosphate, fix nitrogen and produce hydrogen cyanide (HCN), ammonia and the enzymes pectinase, cellulase and chitinase. A total of 136 bacteria were isolated, with 83 of them presenting some plant growth mechanism: 47 % phosphate solubilizers, 26 % nitrogen fixers and 57 % producing IAA, 0.7 % HCN and chitinase, 45 % ammonia, 30 % cellulose and 8 % pectinase. The seven best isolates were tested for their ability to promote plant growth in maize. The isolates tested for plant growth promotion belong to the Enterobacteriaceae family and the Klebsiella, Enterobacter and Pantoea genera. Five isolates promoted plant growth in greenhouse experiments, showing potential as biofertilizers.

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Section: Resultsmentioning

confidence: 99%

Isolation and selection of plant growth-promoting bacteria associated with sugarcane

Rodrigues

Forzani

Soares

et al. 2016

Pesqui. Agropecu. Trop.

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“…Interactions between the plant genotype and the Azospirillum bacteria are one of the variables that contribute most to the complexity of responses to inoculation (Sala et al, 2005), determining the importance of the association of promising genotypes with nitrogen-fixing bacteria and nitrogen fertilization.…”

Section: Introductionmentioning

confidence: 99%

Growth and yield of corn hybrids in response to association with Azospirillum brasilense and nitrogen fertilization

et al. 2015

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Growth and yield of corn hybrids in response to association withAzospirillum brasilense and nitrogen fertilization 1 There is a growing interest in optimizing the positive effects of the association between Azospirillum bacteria and corn crop in order to reduce the use of nitrogen fertilizers. This study aimed to evaluate the inoculation efficiency of an A. brasilense-based commercial product in association with different rates of nitrogen fertilization in two corn genotypes. The experiment was arranged in a 2 x 2 x 5 factorial randomized block design, with four replications. The treatments consisted of two corn hybrids (30F53 and CD386); with and without inoculation with a commercial product based on A. brasilense and five nitrogen rates (0, 40, 80, 120 and 160 kg ha -1 ). The variables plant height, basal stem diameter, leaf area, shoot dry matter, leaf nitrogen content, length and diameter of the cob, weight of 100 grains and grain yield were evaluated. Inoculation with A. brasilense provided increases of 11 and 12% in leaf area and shoot dry matter, respectively. There were differences in the response of the corn hybrids for most variables and the increase in nitrogen supply provided increments in the growth and yield of corn.

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“…On the other hand, nitrogen is the element of greater complexity of action on the environmental conditions, resulting in years of high or low temperature and rainfall, significant losses by leaching and/or volatilization, therefore, compromising nutrient use efficiency, reducing productivity, increasing costs and causing environmental pollution (Benin et al, 2012). Thus, there is a need to optimize food production from technologies that ensure productivity with reduced costs and sustainability in agricultural ecosystems (Sala et al, 2005;Viola et al, 2013). In this context, several authors have reported the possibility of using nitrogen economically adjusted to the condition of the agricultural year using fractionation to obtain greater efficiency of grain yield (Arenhardt et al, 2015;Espindula et al, 2014;Mantai et al, 2016).…”

Section: Introductionmentioning

confidence: 99%