|Online ISSN : 2349-8080
Issues : 12 per year
Publisher : Excellent Publishers
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Instituto Politécnico Nacional, México City 11340, México
Duckweeds a kind of aquatic plants classified as macrophytes, have been considered as nutrient pumps that can help to reduce the eutrophication effects. Studies of endophyte associates focused to their functional analysis contributing the knowledge of plant microbe interactions. This work compared the phytohormones in vitro production efficiency of endophyte bacteria isolated from Lemna gibba plants and their plant growth promoting effect in this plant species. Five endophyte bacteria belonging to Bacillus genera and named: Bacillus sp. strain Fb1, Bacillus sp. strain Fb2, Bacillus sp. strain Fb3, Bacillus sp. strain Fb4 and Bacillus sp. strain Fb5 were isolated. The IAA quantified as basal and inherent production without the addition of the amino acid tryptophan showed that Bacillus sp. strain Fb1, Bacillus sp. strain Fb3 and Bacillus sp. strain Fb5, were considered as higher producers (24.21, 25.44 and 30.8 μg/mL, respectively). Even the effect of plant growth (EPG) on Lemna gibba plants was between 40 to 70 %; a suitable promoting activity by the endophyte bacteria tested was obtained, and could be associated with their IAA production. This work contributes to the knowledge of the phytobacteria diversity in aquatic plants, particularly in Lemnaceae species; here the five endophyte bacteria could be candidates to be recommended as biostimulants.