Multifunctional potential of endophytic and rhizospheric microbial isolates associated with Butia purpurascens roots for promoting plant growth

Antonie van Leeuwenhoek
Cintia Faria da SilvaEdson Luiz Souchie

Abstract

The functional diversity of endophytic and rhizospheric microorganisms associated with the promotion of plant growth includes increased availability of plant nutrients, phytohormone synthesis and phytopathogen suppression. We used the hypothesis that the unknown root and rhizospheric community associated with the Butia purpurascens palm, an endemic species of the Cerrado, could be composed of microbiota with great functional diversity. Thus, the potential of the isolates of this community for four functional traits was evaluated: solubilization of calcium phosphate (CaHPO4) and iron phosphate (FePO4), synthesis of indoleacetic acid (IAA) and suppression of seed- and fruit-spoilage fungi of B. purpurascens. A total of 166 bacterial isolates, most belonging to the phylum Proteobacteria (94%), and 46 fungal isolates (Ascomycota) were tested. None of the isolates showed the four functional traits tested, but 72% presented two traits (CaHPO4 solubilization and IAA synthesis). Fifteen fungi (27% of the isolates) presented only the trace for IAA, whereas the capacity for antibiosis was observed in only eight bacteria. CaHPO4-solubilization capacity was evidenced by all bacterial isolates and by some fungal isolates. The functional tra...Continue Reading

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Methods Mentioned

BETA
PCA

Software Mentioned

JMODELTEST
SISVAR
MEGA
Statistica
MRBAYES
BLASTn
CLUSTAL OMEGA

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