Hemoglobin in a nonleguminous plant, parasponia: possible genetic origin and function in nitrogen fixation |
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| Authors: | Appleby C A Tjepkema J D Trinick M J |
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| 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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