Eucalyptus growth promotion by endophytic Bacillus spp

Clonal eucalyptus plantings have increased in recent years; however, some clones with high production characteristics have vegetative propagation problems because of weak root and aerial development. Endophytic microorganisms live inside healthy plants without causing any damage to their hosts and c...

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Bibliographic Details
Published in:	Genetics and molecular research Vol. 11; no. 4; pp. 3711 - 3720
Main Authors:	Paz, I C P, Santin, R C M, Guimarães, A M, Rosa, O P P, Dias, A C F, Quecine, M C, Azevedo, J L, Matsumura, A T S
Format:	Journal Article
Language:	English
Published:	Brazil 01-01-2012
Subjects:	Bacillus - isolation & purification Bacillus - physiology Biomass Endophytes - isolation & purification Endophytes - physiology Eucalyptus - growth & development Eucalyptus - microbiology Hybridization, Genetic Indoleacetic Acids - metabolism Nitrogen Fixation Phosphates - metabolism Phylogeny Plant Roots - microbiology Plant Stems - microbiology Solubility
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Summary:	Clonal eucalyptus plantings have increased in recent years; however, some clones with high production characteristics have vegetative propagation problems because of weak root and aerial development. Endophytic microorganisms live inside healthy plants without causing any damage to their hosts and can be beneficial, acting as plant growth promoters. We isolated endophytic bacteria from eucalyptus plants and evaluated their potential in plant growth promotion of clonal plantlets of Eucalyptus urophylla x E. grandis, known as the hybrid, E. urograndis. Eighteen isolates of E. urograndis, clone 4622, were tested for plant growth promotion using the same clone. These isolates were also evaluated for indole acetic acid production and their potential for nitrogen fixation and phosphate solubilization. The isolates were identified by partial sequencing of 16S rRNA. Bacillus subtilis was the most prevalent species. Several Bacillus species, including B. licheniformis and B. subtilis, were found for the first time as endophytes of eucalyptus. Bacillus sp strain EUCB 10 significantly increased the growth of the root and aerial parts of eucalyptus plantlets under greenhouse conditions, during the summer and winter seasons.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	1676-5680 1676-5680
DOI:	10.4238/2012.August.17.9