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-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.
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Claims 3
Claim · model-written summary
Illuminating bacterial cultures before inoculation increased nodules per pea plant.
- Taxon
- pea
Lathyrus oleraceuse0 - Treatment
- illumination of bacterial cultures before inoculatione0
- Interactor
- R. leguminosarum bv. viciae 3841
Rhizobium leguminosarume1symbiont - Outcome
- number of nodules per plante0
- Direction
- increasese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“illumination of bacterial cultures before inoculation of pea roots increases the number of nodules per plant”
e1“R. leguminosarum bv. viciae 3841, a pea-nodulating endosymbiont”
Claim · model-written summary
Illuminating bacterial cultures before inoculation increased intranodular bacteroids.
- Taxon
- peaLathyrus oleraceuse0
- Treatment
- illumination of bacterial cultures before inoculatione0
- Interactor
- R. leguminosarum bv. viciae 3841Rhizobium leguminosarume1symbiont
- Outcome
- number of intranodular bacteroidse0
- Direction
- increasese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“illumination of bacterial cultures before inoculation of pea roots increases the number of nodules per plant and the number of intranodular bacteroids”
e1“R. leguminosarum bv. viciae 3841, a pea-nodulating endosymbiont”
Claim · model-written summary
Light effects on nodulation required a functional lov gene.
- Taxon
- peaLathyrus oleraceuse1
- Interactor
- R. leguminosarum bv. viciae 3841Rhizobium leguminosarume2symbiont
- Gene
- love0
- Outcome
- effects of light on nodulatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The effects of light on nodulation are dependent on a functional lov gene”
e1“inoculation of pea roots”
e2“R. leguminosarum bv. viciae 3841, a pea-nodulating endosymbiont”
The same questions in other papers
inoculation · Rhizobium leguminosarum · Lathyrus oleraceus (pea)Results differ
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- no effect
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See all 17 papers →light · Rhizobium leguminosarum · Lathyrus oleraceus (pea)Results agree
4 papers in the same direction as this paper
- positive
- positive
- positive
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See all 5 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.