Microbial biostimulants as alternatives for the rooting of olive tree cuttings

Gustavo Magno  dos Reis Ferreira; Luiz Fernando de Oliveira Silva; Moacir Pasqual; Rogério Melloni; José Magno Queiroz Luz; Joyce  Dória

doi:10.14393/BJ-v38n0a2022-53570

Autores

Gustavo Magno dos Reis Ferreira Universidade Federal de Lavras
Luiz Fernando de Oliveira Silva Empresa de Pesquisa Agropecuária de Minas Gerais https://orcid.org/0000-0002-4250-3621
Moacir Pasqual Universidade Federal de Lavras https://orcid.org/0000-0001-5612-9186
Rogério Melloni Universidade Federal de Itajubá https://orcid.org/0000-0002-2724-2603
José Magno Queiroz Luz Universidade Federal de Uberlândia
Joyce Dória Universidade Federal de Lavras https://orcid.org/0000-0002-7727-5016

DOI:

https://doi.org/10.14393/BJ-v38n0a2022-53570

Palavras-chave:

Mycorrhiza, Olea europaea L. Rhizobacteria, Rhizogenic potential, Rooted cuttings.

Resumo

Atualmente, o sul de Minas Gerais (MG) é um importante produtor de diferentes cultivares de oliveira (Olea europaea L.), pois nessa região é possível haver diferenciação dos brotos das plantas em flores e, posteriormente, frutos. Para estimular o enraizamento das estacas, o hormônio sintético ácido indol-3-butírico (AIB), na concentração de 3 g L^-1, tem sido utilizado comercialmente. No entanto, poucos estudos investigaram fungos micorrízicos arbusculares (FMA), isolados ou combinados com rizobactérias, como uma ferramenta biotecnológica para a produção de hormônios que atuam no enraizamento de estacas de oliveiras. O objetivo deste trabalho foi avaliar a capacidade de diferentes espécies de FMA (Rhizophagus clarus, Gigaspora rosea ou Acaulospora scrobiculata), combinadas ou não com AIB ou rizobactérias, de promover o enraizamento de estacas de 3 cultivares de oliveira (Arbequina, Grappolo 541 e Maria da Fé) com potencial para cultivo nessa região. Para isso, três experimentos foram conduzidos na Fazenda Experimental da EPAMIG em Maria da Fé (MG), avaliando-se o potencial de enraizamento de estacas de oliveiras inoculadas com I) FMA, II) FMA combinados com doses crescentes de AIB e III) FMA combinados com três isolados de rizobactérias. A inoculação de estacas de oliveira das cultivares Arbequina, Grappolo 541 e Maria da Fé com Rhizophagus clarus, Gigaspora rosea ou Acaulospora scrobiculata, combinadas ou não com IBA ou rhizobacteria, não promoveu significativamente o enraizamento de estacas de oliveira. Formas alternativas de enraizamento de estacas de oliveira ainda são um desafio, sendo necessários mais estudos para padronizar metodologias e condições experimentais.

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