The Mo- and Fe-nitrogenases of the endophyte Kosakonia sp. UYSO10 are necessary for growth promotion of sugarcane

Aim Sugarcane is a multipurpose crop primarily used to produce sugar, energy and bioethanol. It requires high amounts of N-fertilization for optimal growth, which increases production costs and environmental degradation. The contribution of biological nitrogen fixation to Uruguayan commercial sugarc...

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Bibliographic Details
Published in:Annals of microbiology 2019-07, Vol.69 (7), p.741-750
Main Authors: Taulé, Cecilia, Luizzi, Hugo, Beracochea, Martín, Mareque, Cintia, Platero, Raúl, Battistoni, Federico
Format: Article
Language:English
Subjects:
Applied Microbiology
Bacteria
Biofuels
Biomedical and Life Sciences
Cultivars
Endophytes
Environmental degradation
Ethanol
Fertilization
Fixation
Growth
Inoculation
Kosakonia
Life Sciences
Manufacturing costs
Medical Microbiology
Microbial Ecology
Microbial Genetics and Genomics
Microbiology
Mycology
NifH gene
Nitrogen
Nitrogen fixation
Nitrogenase
Original Article
Phenotypes
Plant growth
Saccharum officinarum
Statistics
Sugar
Sugarcane
Uruguay
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Summary:Aim Sugarcane is a multipurpose crop primarily used to produce sugar, energy and bioethanol. It requires high amounts of N-fertilization for optimal growth, which increases production costs and environmental degradation. The contribution of biological nitrogen fixation to Uruguayan commercial sugarcane cultivars was demonstrated previously, and diazotrophic bacteria that were isolated from the stems were characterized and identified. From this collection, the isolate UYSO10 related to the Kosakonia genus (formerly Enterobacter ) was described as a plant growth-promoting endophyte of sugarcane plants. Purpose To evaluate the effect of the inoculation of wild-type and nitrogenase-deficient strains of Kosakonia sp. UYSO10 on sugarcane growth promotion under non-sterile conditions. Methods Kosakonia sp. UYSO10 was inoculated onto sugarcane setts for plant growth promotion greenhouse experiments. Single and double mutants resulting to the nitrogenase-encoding genes ( nifH , anfH ) were constructed, and the phenotypes were evaluated in vitro and in vivo . Results Kosakonia sp. UYSO10 is able to promote sugarcane growth under non-sterile conditions, that strain UYSO10 harbors two functional nitrogenases and the inactivation of both nitrogenase-encoding genes diminish its capacity of promoting growth on sugarcane. Conclusion All together, the results obtained showed that the biological nitrogen fixation ability of Kosakonia sp. UYSO10 is required for sugarcane growth promotion.
ISSN:1590-4261
1869-2044
DOI:10.1007/s13213-019-01466-7