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Science 27 May 1983:
Vol. 220. no. 4600, pp. 951 - 953
DOI: 10.1126/science.220.4600.951
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Articles

Hemoglobin in a Nonleguminous Plant, Parasponia: Possible Genetic Origin and Function in Nitrogen Fixation

CYRIL A. APPLEBY 1, JOHN D. TJEPKEMA 2, and MICHAEL J. TRINICK 3

1 Division of Plant Industry, Commonwealth Scientific and Industrial Research Organization (CSIRO), Canberra, Australia 2601
2 Harvard Forest, Harvard University, Petersham, Massachusetts 01366
3 Division of Plant Industry, CSIRO

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.

Submitted on November 19, 1982
Revised on January 11, 1983


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Science. ISSN 0036-8075 (print), 1095-9203 (online)