info:eu-repo/semantics/article
Light regulates attachment, exopolysaccharide production, and nodulation in Rhizobium leguminosarum through a LOV-histidine kinase photoreceptor
Fecha
2012-07Registro en:
Bonomi, Hernan Ruy; Posadas, Diana Maria; Paris, Gastón; Carrica, Mariela del Carmen; Frederickson, Marcus; et al.; Light regulates attachment, exopolysaccharide production, and nodulation in Rhizobium leguminosarum through a LOV-histidine kinase photoreceptor; National Academy Of Sciences; Proceedings Of The National Academy Of Sciences Of The United States Of America; 109; 30; 7-2012; 12135-12140
1091-6490
Autor
Bonomi, Hernan Ruy
Posadas, Diana Maria
Paris, Gastón
Carrica, Mariela del Carmen
Frederickson, Marcus
Pietrasanta, Lia
Bogomolni, Roberto A.
Zorreguieta, Angeles
Goldbaum, Fernando Alberto
Resumen
Rhizobium leguminosarum is a soil bacterium that infects root hairs and induces the formation of nitrogen-fixing nodules on leguminous plants. Light, oxygen, and voltage (LOV)-domain proteins are blue-light receptors found in higher plants and many algae, fungi, and bacteria. The genome of R. leguminosarum bv. viciae 3841, a pea-nodulating endosymbiont, encodes a sensor histidine kinase containing a LOV domain at the N-terminal end (R-LOV-HK). R-LOV-HK has a typical LOV domain absorption spectrum with broad bands in the blue and UV-A regions and shows a truncated photocycle. Here we show that the R-LOV-HK protein regulates attachment to an abiotic surface and production of flagellar proteins and exopolysaccharide in response to light. Also, illumination of bacterial cultures before inoculation of pea roots increases the number of nodules per plant and the number of intranodular bacteroids. The effects of light on nodulation are dependent on a functional lov gene. The results presented in this work suggest that light, sensed by R-LOV-HK, is an important environmental factor that controls adaptive responses and the symbiotic efficiency of R. leguminosarum.