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

Authors

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

Keywords:

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

Abstract

Currently, southern Minas Gerais (MG) state is an important producer of different olive tree (Olea europaea L.) cultivars because, in this region, the plants can differentiate the buds to produce flowers and fruit. To stimulate the rooting of cuttings, the synthetic hormone indole-3-butyric acid (IBA) at a concentration of 3 g L⁻¹ is used commercially. However, few studies have investigated arbuscular mycorrhizal fungi (AMF), isolated or combined with rhizobacteria, as a biotechnological tool to produce hormones that function in the rooting of olive tree cuttings. The aim of this study was to evaluate the capacity of different AMF species (Rhizophagus clarus, Gigaspora rosea, or Acaulospora scrobiculata), combined or not with IBA or rhizobacteria, to promote the rooting of three olive tree cuttings (Arbequina, Grappolo 541, and Maria da Fé) with potential for cultivation in this region. For this, three experiments were conducted at the Experimental Farm of EPAMIG in Maria da Fé (MG), and the rooting potential of the olive tree cuttings inoculated with I) AMF, II) AMF combined with increasing doses of IBA, and III) AMF combined with three isolates of rhizobacteria was evaluated. The inoculation of olive tree cuttings of cultivars Arbequina, Grappolo 541, and Maria da Fé with Rhizophagus clarus, Gigaspora rosea, or Acaulospora scrobiculata combined or not with IBA or rhizobacteria did not significantly promote rooting. Alternative forms of rooting olive tree cuttings are still a challenge, and further studies for standardizing methodologies and experimental conditions are required.

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