scholarly journals Uso de inoculante Azospirillum brasilense na produção de mudas de Tento Carolina

2021 ◽  
Vol 10 (1) ◽  
pp. e4210111469
Author(s):  
Luciana Santos Almeida ◽  
Severino de Paiva Sobrinho ◽  
Petterson Baptista da Luz ◽  
Daniela Soares Alves Caldeira ◽  
Altacis Junior de Oliveira ◽  
...  

As Bactérias diazotróficas Azospirillum brasilense são benéficas para as plantas devido à capacidade de quebrar a molécula de N2, facilitando sua assimilação pelas plantas, além disso, é considerada promotora de crescimento vegetativo, pois, induzem na produção e liberação de fitormônios como auxinas, giberelinas e citocininas, responsáveis pelo crescimento vegetativo e expansão do sistema radicular. Devido à espécie de Tento Carolina ser bastante utilizada em arborização urbana e em áreas de reflorestamento, objetivou-se neste trabalho avaliar o efeito da inoculação de Azospirillum brasilense, em diferentes doses, no desenvolvimento de mudas de Tento Carolina (Adenanthera pavonina L.). A pesquisa foi composta por um ensaio com delineamento experimental inteiramente casualizado com seis tratamentos, quatro repetições e quatro plantas por parcela. As doses utilizadas foram: T1: 0 ml (testemunha); T2: 0,3 ml; T3: 0,6 ml; T4: 0,9 ml; T5: 1,2 ml e T6: 1,5 ml) para 30 gramas de sementes. O experimento foi conduzido em casa de vegetação, no município de Cáceres, MT. As avaliações morfológicas das plantas foram realizadas 120 dias após a semeadura. Os dados foram submetidos ao programa computacional R, aplicando-se o teste F para diagnóstico de efeito significativo, e as médias comparadas pelo teste Tukey a 5% de probabilidade. Os resultados obtidos apontam que houve diferença significativa entre os tratamentos com utilização de Azospirillum brasilense, e somente para as variáveis de número de folhas e relação altura da parte aérea/diâmetro do coleto seu uso foi indiferente. Nenhum tratamento com inoculante apresentou resultado superior ao tratamento denominado testemunha.

2021 ◽  
Vol 90 (1) ◽  
pp. 64-75
Author(s):  
А. В. Шелудько ◽  
Д. И. Мокеев ◽  
С. С. Евстигнеева ◽  
Ю. А. Филипьечева ◽  
А. М. Буров ◽  
...  

2018 ◽  
Vol 31 (1) ◽  
pp. 1-8
Author(s):  
MARCOS DA SILVA BRUM ◽  
THOMAS NEWTON MARTIN ◽  
VINÍCIUS SANTOS DA CUNHA ◽  
LUIZ FERNANDO TELEKEN GRANDO ◽  
ALEX TAGLIAPIETRA SCHONELL

ABSTRACT The objective of this study was to evaluate the phytomorphological parameters of soybean in a crop-livestock system inoculated with Azospirillum brasilense. The experiment was conducted in Santa Maria, Brazil, for two agricultural years (2 Paper extracted from the doctoral thesis of the first author. 012/2013 and 2013/2014) in a randomized complete block design with three replications. In the winter, the black oat and ryegrass pasture was managed with sheep under different grazing systems: (I) - a conventional grazing (CG) system, where the animals remained in the pasture throughout the experimental period without any pasture height control; (II, III, and IV) - systems with post-grazing pasture heights of 10, 20, and 30 cm, respectively; and (NG) - one control without grazing. All treatments received two nitrogen doses (50 and 100 kg ha-1) and inoculation or no inoculation (A. brasilense). The soybean cultivar BMX Potência RR was sown using no-tillage on 16 November 2012 and 1 December 2013. In each plot, seven rows of plants with spacing of 0.45 m were used, and in four rows, the seeds were inoculated with the bacterium A. brasilense. The phytomorphological variables and grain productivity were evaluated. In a croplivestock system, soybean has better productivity when established on black oat and ryegrass pasture managed with post-grazing pasture heights of between 20 and 30 cm. Areas under conventional grazing in the winter led to smaller soybean plants with lower first and last pod heights. Inoculation with A. brasilense should not be used alone in soybean cultivation.


2021 ◽  
Vol 11 (1) ◽  
Author(s):  
José Francisco Cruz-Pérez ◽  
Roxana Lara-Oueilhe ◽  
Cynthia Marcos-Jiménez ◽  
Ricardo Cuatlayotl-Olarte ◽  
María Luisa Xiqui-Vázquez ◽  
...  

AbstractThe plant growth-promoting bacterium Azospirillum brasilense contains several genes encoding proteins involved in the biosynthesis and degradation of the second messenger cyclic-di-GMP, which may control key bacterial functions, such as biofilm formation and motility. Here, we analysed the function and expression of the cdgD gene, encoding a multidomain protein that includes GGDEF-EAL domains and CHASE and PAS domains. An insertional cdgD gene mutant was constructed, and analysis of biofilm and extracellular polymeric substance production, as well as the motility phenotype indicated that cdgD encoded a functional diguanylate protein. These results were correlated with a reduced overall cellular concentration of cyclic-di-GMP in the mutant over 48 h compared with that observed in the wild-type strain, which was recovered in the complemented strain. In addition, cdgD gene expression was measured in cells growing under planktonic or biofilm conditions, and differential expression was observed when KNO3 or NH4Cl was added to the minimal medium as a nitrogen source. The transcriptional fusion of the cdgD promoter with the gene encoding the autofluorescent mCherry protein indicated that the cdgD gene was expressed both under abiotic conditions and in association with wheat roots. Reduced colonization of wheat roots was observed for the mutant compared with the wild-type strain grown in the same soil conditions. The Azospirillum-plant association begins with the motility of the bacterium towards the plant rhizosphere followed by the adsorption and adherence of these bacteria to plant roots. Therefore, it is important to study the genes that contribute to this initial interaction of the bacterium with its host plant.


1991 ◽  
pp. 749-754
Author(s):  
Maria A. Vanoni ◽  
Giuliana Zanetti ◽  
Bruno Curti ◽  
Dale E. Edmondson

Author(s):  
Fernando Shintate Galindo ◽  
João Leonardo Miranda Bellotte ◽  
José Mateus Kondo Santini ◽  
Salatiér Buzetti ◽  
Poliana Aparecida Leonel Rosa ◽  
...  

2013 ◽  
Vol 380 ◽  
pp. 76-80 ◽  
Author(s):  
Elena N. Sigida ◽  
Yuliya P. Fedonenko ◽  
Alexander S. Shashkov ◽  
Evelina L. Zdorovenko ◽  
Svetlana A. Konnova ◽  
...  

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