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Folia Microbiol (Praha)

Title:		Medicago truncatula increases its iron-uptake mechanisms in response to volatile organic compounds produced by Sinorhizobium meliloti
Author(s):		Orozco-Mosqueda Mdel C; Macias-Rodriguez LI; Santoyo G; Farias-Rodriguez R; Valencia-Cantero E;
Address:		"Instituto de Investigaciones Quimico-Biologicas, Universidad Michoacana de San Nicolas de Hidalgo, Edificio B5 Ciudad Universitaria, Morelia, Michoacan, Mexico, C.P. 58030"
Journal Title:		Folia Microbiol (Praha)
Year:		2013
Volume:		20130407
Issue:		6
Page Number:		579 - 585
DOI:		10.1007/s12223-013-0243-9
ISSN/ISBN:		1874-9356 (Electronic) 0015-5632 (Linking)
Abstract:		"Medicago truncatula represents a model plant species for understanding legume-bacteria interactions. M. truncatula roots form a specific root-nodule symbiosis with the nitrogen-fixing bacterium Sinorhizobium meliloti. Symbiotic nitrogen fixation generates high iron (Fe) demands for bacterial nitrogenase holoenzyme and plant leghemoglobin proteins. Leguminous plants acquire Fe via 'Strategy I,' which includes mechanisms such as rhizosphere acidification and enhanced ferric reductase activity. In the present work, we analyzed the effect of S. meliloti volatile organic compounds (VOCs) on the Fe-uptake mechanisms of M. truncatula seedlings under Fe-deficient and Fe-rich conditions. Axenic cultures showed that both plant and bacterium modified VOC synthesis in the presence of the respective symbiotic partner. Importantly, in both Fe-rich and -deficient experiments, bacterial VOCs increased the generation of plant biomass, rhizosphere acidification, ferric reductase activity, and chlorophyll content in plants. On the basis of our results, we propose that M. truncatula perceives its symbiont through VOC emissions, and in response, increases Fe-uptake mechanisms to facilitate symbiosis"
Keywords:		"Biomass Chlorophyll/analysis FMN Reductase/metabolism Hydrogen-Ion Concentration Iron/*metabolism Medicago truncatula/chemistry/growth & development/*metabolism/*microbiology Root Nodules, Plant/microbiology Sinorhizobium meliloti/*metabolism Soil/chemist;"
Notes:		"MedlineOrozco-Mosqueda, Maria del Carmen Macias-Rodriguez, Lourdes I Santoyo, Gustavo Farias-Rodriguez, Rodolfo Valencia-Cantero, Eduardo eng Research Support, Non-U.S. Gov't 2013/04/09 Folia Microbiol (Praha). 2013 Nov; 58(6):579-85. doi: 10.1007/s12223-013-0243-9. Epub 2013 Apr 7"