title: Hemoglobin in a nonleguminous plant, parasponia: possible genetic origin and function in nitrogen fixation.
abstract: A dimeric hemoglobin was purified from nitrogen-fixing root nodules formed by association of Rhizobium with a nonleguminous plant, Parasponia. The oxygen dissociation rate constant is probably sufficiently high to allow Parasponia hemoglobin to function in a fashion similar to that of leghemoglobin, by oxygen buffering and transport during symbiotic nitrogen fixation. The identification of hemoglobin in a nonlegume raises important questions about the evolution of plant hemoglobin genes.
authors.forename: C A
authors.initials: CA
authors.lastname: Appleby
authors.forename: J D
authors.initials: JD
authors.lastname: Tjepkema
authors.forename: M J
authors.initials: MJ
authors.lastname: Trinick