title: All nod genes of Rhizobium meliloti are involved in alfalfa nodulation by exo mutants.
abstract: Nodulation of alfalfa by exoB mutants of Rhizobium meliloti occurred without root hair curling or infection thread formation. nod exoB double mutants had the same nodulation deficiency as single nod mutants. Therefore, all the known nod genes are involved in nodule induction by exoB mutants, which apparently occurs via intercellular invasion.
authors.affiliation: Department of Biology, Massachusetts Institute of Technology, Cambridge 02139.
authors.forename: S
authors.initials: S
authors.lastname: Klein
authors.forename: G C
authors.initials: GC
authors.lastname: Walker
authors.forename: E R
authors.initials: ER
authors.lastname: Signer
mesh_terms: D002872:Chromosome Deletion; D005798:Genes, Bacterial; D000455:Medicago sativa / Q000382:microbiology*; D009154:Mutation; D010641:Phenotype; D010957:Plasmids; D012231:Rhizobium / Q000235:genetics* / Q000502:physiology