title: Chromosomal nodulation genes: Sym-plasmid containing Agrobacterium strains need chromosomal virulence genes (chvA and chvB) for nodulation.
abstract: The chromosomal genes chvA and chvB of Agrobacterium tumefaciens, which mediate attachment to plant cells, were found to be essential not only for tumour induction but also for the formation of root nodules on plants.
authors.affiliation: Department of Plant Molecular Biology, Biochemistry Lab., Wassenaarseweg 64, 2333 AL, Leiden, The Netherlands.
authors.forename: R J
authors.initials: RJ
authors.lastname: van Veen
authors.forename: H
authors.initials: H
authors.lastname: den Dulk-Ras
authors.forename: R A
authors.initials: RA
authors.lastname: Schilperoort
authors.forename: P J
authors.initials: PJ
authors.lastname: Hooykaas