Performance of different genotypes of maize subjected to inoculation with Azospirillum brasilense

Cuna, Fernando Nobre; Silva, NelmÃ­cio Furtado da; Rodrigues, Carlos Ribeiro; Morais, Wilker Alves; Gomes, FlÃ¡vio Henrique Ferreira; Filho, L.C. Lopes; Cabral, Lays Borges dos Santos; Teixeira, Marconi Batista; Vieira, Gustavo da Silva; Costa, Cícero Teixeira Silva

doi:10.5897/ajar2016.11496

Cited by 3 publications

(2 citation statements)

References 27 publications

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“…The few studies that have reported the differential responsiveness among maize genotypes to A . brasilense inoculation were based on a smaller number of hybrids or inbred lines [5,6,54]. Moreover, as far as we know, our report has evaluated the largest number of maize genotypes for their association with PGPB.…”

Section: Discussionmentioning

confidence: 99%

Additive and heterozygous (dis)advantage GWAS models reveal candidate genes involved in the genotypic variation of maize hybrids to Azospirillum brasilense

et al. 2019

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Maize genotypes can show different responsiveness to inoculation with Azospirillum brasilense and an intriguing issue is which genes of the plant are involved in the recognition and growth promotion by these Plant Growth-Promoting Bacteria (PGPB). We conducted Genome-Wide Association Studies (GWAS) using additive and heterozygous (dis)advantage models to find candidate genes for root and shoot traits under nitrogen (N) stress and N stress plus A. brasilense. A total of 52,215 Single Nucleotide Polymorphism (SNP) markers were used for GWAS analyses. For the six root traits with significant inoculation effect, the GWAS analyses revealed 25 significant SNPs for the N stress plus A. brasilense treatment, in which only two were overlapped with the 22 found for N stress only. Most were found by the heterozygous (dis)advantage model and were more related to exclusive gene ontology terms. Interestingly, the candidate genes around the significant SNPs found for the maize–A. brasilense association were involved in different functions previously described for PGPB in plants (e.g. signaling pathways of the plant's defense system and phytohormone biosynthesis). Our findings are a benchmark in the understanding of the genetic variation among maize hybrids for the association with A. brasilense and reveal the potential for further enhancement of maize through this association.

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Section: Discussionmentioning

confidence: 99%

Additive and heterozygous (dis)advantage GWAS models reveal candidate genes involved in the genotypic variation of maize hybrids to Azospirillum brasilense

et al. 2019

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“…Previous studies have shown differential responses among plant genotypes to Azospirillum sp. inoculation [8,9]. Genotypes may vary according to the amount and composition of the substances released in the exudates, as well the genes related to the plant defense mechanisms, directly affecting the responses to the inoculation [10,11].…”

Section: Introductionmentioning

confidence: 99%

Maize responsiveness to Azospirillum brasilense: Insights into genetic control, heterosis and genomic prediction

et al. 2019

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Several studies have shown differences in the abilities of maize genotypes to facilitate or impede Azospirillum brasilense colonization and to receive benefits from this association. Hence, our aim was to study the genetic control, heterosis effect and the prediction accuracy of the shoot and root traits of maize in response to A . brasilense . For that, we evaluated 118 hybrids under two contrasting scenarios: i) N stress (control) and ii) N stress plus A . brasilense inoculation. The diallel analyses were performed using mixed model equations, and the genomic prediction models accounted for the general and specific combining ability (GCA and SCA, respectively) and the presence or not of G×E effects. In addition, the genomic models were fitted considering parametric (G-BLUP) and semi-parametric (RKHS) kernels. The genotypes showed significant inoculation effect for five root traits, and the GCA and SCA were significant for both. The GCA in the inoculated treatment presented a greater magnitude than the control, whereas the opposite was observed for SCA. Heterosis was weakly influenced by the inoculation, and the heterozygosity and N status in the plant can have a role in the benefits that can be obtained from this Plant Growth-Promoting Bacteria (PGPB). Prediction accuracies for N stress plus A . brasilense ranged from 0.42 to 0.78, depending on the scenario and trait, and were higher, in most cases, than the non-inoculated treatment. Finally, our findings provide an understanding of the quantitative variation of maize responsiveness to A . brasilense and important insights to be applied in maize breeding aiming the development of superior hybrids for this association.

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SOIL CORRECTION AND <i>Azospirillum brasilense</i>: STRATEGIES IN THE CULTIVATION OF MAIZE GENOTYPES IN SEMI-ARID REGIONS

Meneses,

Aragão,

Pompeu

et al. 2024

Acta biol. Colomb.

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The replacement of Caatinga by extensive agriculture has led to soil degradation in maize (Zea mays L.) growing areas. The objective of this study was to evaluate the effects of soil correction in association with Azospirillum brasiliense to replace nitrogen (N) fertilizer on the vegetative growth of two maize genotypes cultivated on degraded soil. The soil was collected in an area undergoing desertification in Irauçuba, Ceará state, Brazil. A 2x2x5 factorial experiment was carried out in blocks: two soil fertility levels (corrected and uncorrected soil in terms of fertility), two maize genotypes (BRS Caimbé and BRS Gorutuba), and five nitrogen sources (control, inoculation with A. brasilense, inoculation with A. brasilense + 50 kg ha-1 of N, 50 kg ha-1 of N, and 100 kg ha-1 of N). BRS Gorutuba genotype showed greater adaptability to the growing conditions evaluated. However, macronutrient concentration did not affect maize dry matter yield. The response of maize inoculated with A. brasiliense suggests the inoculation efficacy, supported by the N accumulation and the effect on plant growth. The dry matter yield in A. brasilense inoculated plants was equivalent to using N fertilizer. Therefore, the inoculation of BRS Gorutuba maize grown on degraded soil with A. brasilense is a promising alternative for farmers in semi-arid regions.

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Performance of different genotypes of maize subjected to inoculation with Azospirillum brasilense

Cited by 3 publications

References 27 publications

Additive and heterozygous (dis)advantage GWAS models reveal candidate genes involved in the genotypic variation of maize hybrids to Azospirillum brasilense

Additive and heterozygous (dis)advantage GWAS models reveal candidate genes involved in the genotypic variation of maize hybrids to Azospirillum brasilense

Maize responsiveness to Azospirillum brasilense: Insights into genetic control, heterosis and genomic prediction

SOIL CORRECTION AND <i>Azospirillum brasilense</i>: STRATEGIES IN THE CULTIVATION OF MAIZE GENOTYPES IN SEMI-ARID REGIONS

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