Full Length Research Paper
ABSTRACT
Xochimilco’s lacustrine zone is a network of channels that, along with the chinampas, conform a unique ecosystem which has served as source of aquatic resources. Duckweeds are small free-floating monocotyledon aquatic plants classified as macrophytes that serve as nutrient pumps and reduce eutrophication effects. Recently, there are number of new studies related to the aquatic plant-microbial interaction focused on the direct functional analysis that investigate plant microbe interactions at full biological hierarchy. The aim of this study was to compare the auxin in vitro production efficiency of the endophyte phytobacteria isolated from Lemna gibba L. plants collected nearby the Xochimilco aquatic agrosystem. There were 17 isolates obtained from the L. gibba plants collected in the dry season and 14 isolates for the rainy season. The environmental conditions and seasonal characteristics determined the number and identity of the isolated endophyte phytobacteria in L. gibba plants according to the several apparent differences in the water quality. This work contributes to the knowledge of the phytobacteria diversity in aquatic plants, particularly in Lemnaceae species; here the majority of the isolates have been characterized as higher indole acetic acid producers, recommended as candidates for their use as biofertilizers.
Key words: Plant growth-promoting bacteria, biofertilizers, Lemna gibba, Xochimilco.
INTRODUCTION
MATERIALS AND METHODS
RESULTS AND DISCUSSION
CONCLUSION
This work contributes to the knowledge of the phytobacteria potential in aquatic plants, particularly in Lemnaceae species; here the majority of the isolates have been characterized as higher IAA producers; recommended to candidates for their use as biofertilizers. The authors suggest further works with these isolates that involves plant-microbe systems as biossays to demonstrate the ecological role that these endophyte phytobacteria have in association with L. gibba plants, for the conservation of aquatic ecosystems.
CONFLICT OF INTERESTS
The authors did not declare any conflict of interest.
ACKNOWLEDGMENTS
The authors are grateful to the Research Projects: ISITDF/325/11 AREAS PRIORITARIAS-IPN and SIP-20131494 and SIP-20141314 of the Secretaría de Investigación y Posgrado del I.P.N., for providing the facilities to carry out this work and wish to thank the Comisión de Operaciones y Fomento de Actividades Académicas (COFAA-IPN), EDI (Estímulo al Desempeño de Investigadores-I.P.N.) and Sistema Nacional de Investigadores (SNI-CONACyT), the fellowships for its support throughout the development of this research work.
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