2012
DOI: 10.1073/pnas.1121292109
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Light regulates attachment, exopolysaccharide production, and nodulation in Rhizobium leguminosarum through a LOV-histidine kinase photoreceptor

Abstract: 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-H… Show more

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Cited by 60 publications
(71 citation statements)
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“…This scenario is consistent with the studies on Rhizobium leguminosarum bv. viciae 3841 in which white light was reported to interfere with the synthesis of bacterial surface determinants that are needed for competent infection and nodulation of pea (Bonomi et al 2012). Inhibition of attachment to root surfaces might also result in fewer infection events with a concomitant reduction in nodule size and weight, which we observed.…”
Section: Discussionsupporting
confidence: 64%
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“…This scenario is consistent with the studies on Rhizobium leguminosarum bv. viciae 3841 in which white light was reported to interfere with the synthesis of bacterial surface determinants that are needed for competent infection and nodulation of pea (Bonomi et al 2012). Inhibition of attachment to root surfaces might also result in fewer infection events with a concomitant reduction in nodule size and weight, which we observed.…”
Section: Discussionsupporting
confidence: 64%
“…Our data support both of these seemingly disparate conclusions because, in L. japonicus, inhibition of nodulation by light is caused by blue light perception by both the host plant roots and rhizobia. Bonomi et al (2012) reported that a short time exposure of rhizobia to white light prior to inoculation enhanced nodulation in Pisum sativum. In our study, a light treatment was given after inoculating with rhizobia, which may explain the differences in results.…”
Section: Discussionmentioning
confidence: 99%
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“…In yet other studies, the role of HRXXN kinases in cellular processes other than the GSR has been demonstrated (44)(45)(46), although, at the same time, their involvement in the GSR has not been assessed, and thus cannot be excluded at this time. For example, in Rhizobium leguminosarum, the orphan HRXXN kinase R-LOV-HK (pLR110320) regulates light-dependent cell attachment, exopolysaccharide production, and nodulation, but the response regulator presumably mediating this response was not identified and the involvement of PhyR in these phenotypes has not been studied (44). In another example, the HRXXN kinase SMa0113 of S. meliloti was shown to regulate both succinatemediated catabolite repression (SMCR) and polyhydroxybutyrate (PHB) production, but its cognate SDRR, SMa0114, seems dispensable for SMCR regulation and plays a noncanonical role in PHB production.…”
Section: Discussionmentioning
confidence: 99%