Potencial de bioprodutos da Amazônia Meridional no enraizamento de clones de eucalipto

Abstract

Eucalyptus is considered an exotic plant and easily adaptable to the country's favorable climate, eucalyptus has become an alternative for the generation of biomass, in addition to contributing directly and indirectly to the generation of jobs. Currently, the state has approximately 187 thousand hectares of eucalyptus plantations, but there is little genetic diversity, with the majority being “urograndis” hybrids of E. grandis and E. urophylla e; “grancam” hybrids of E. camaldulensis and E. grandis. With the expansion of forestry planting without prior knowledge of the genetic material and techniques used, the number of diseases in the crop grows, causing economic problems for the producer. Unlike annual crops, the forestry sector has few registered commercial products, mainly in nurseries, aimed at obtaining healthy seedlings. Thus, the study aimed to evaluate the contribution of bioproducts from saprobic conidial fungi from Southern Amazonia, yeast Pichia sp. and homeopathic preparation based on propolis extract in the rooting of eucalyptus clonal seedlings (H13 and VM01). The work was carried out at the Flora Sinop nursery and at the Microbiology/Phytopathology laboratory at the Federal University of Mato Grosso/Sinop. 350 clonal eucalyptus seedlings of clones H13 and VM01 were evaluated. Filters of Conidial Saprobian Fungi from Southern Amazon Brachysporiella sp., Pseudobotrytis terrestris, Gonytrichum sp., Ellisembia sp. and Pichia sp. yeast, propolis extract as homeopathy and other 02 on-farm products (Azospirillum brasiliense and Pseudomonas fluorescens) were applied in the substrate. The variables analyzed in this work were root and shoot length, stem diameter and dry weight of root and shoot. In general, clone H13 did not show a significant difference between the treatments used because it is considered a clone of good genetic material, however, there was a notable significant difference for clone VM01, and the treatment with co-inoculation (Azospirillum brasiliense x Pseudomonas fluorescens) showed interaction in all analyzed variables. Thus, the co-inoculation treatment with A. brasiliense and P. fluorescens contributed positively to the rooting of clone VM01.