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. 1983 May 27;220(4600):951-3.
doi: 10.1126/science.220.4600.951.

Hemoglobin in a nonleguminous plant, parasponia: possible genetic origin and function in nitrogen fixation

C A Appleby, J D Tjepkema, M J Trinick

Hemoglobin in a nonleguminous plant, parasponia: possible genetic origin and function in nitrogen fixation

C A Appleby et al. Science. .

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.

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