FRANKIA SOURCE AFFECTS GROWTH, NODULATION AND NITROGEN FIXATION IN CASUARINA SPECIES
Paul Reddell, G. D. Bowen
Abstract
Paul Reddell, G. D. Bowen
Abstract
Summary Two species of Casuarina [C. equisetifolia ssp. incana (Benth.) L.J. and C. cunninghamiana Miq.] differed in growth responses to inoculation with Frankia from five sources. Casuarina equisetifolia ssp. incana formed nodules with all five Frankia inocula whereas C. cunninghamiana formed nodules with only two. A range of response from ineffectiveness in N2 fixation to high effectiveness was observed between Casuarina species ‐ Frankia source combinations. Strains of Frankia highly effective on one species were frequently ineffective on the other. Effectiveness was related to nodule development after infection and to the ability of developed nodules to fix N2.
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Summary Two species of Casuarina [C. equisetifolia ssp. incana (Benth.) L.J. and C. cunninghamiana Miq.] differed in growth responses to inoculation with Frankia from five sources. Casuarina equisetifolia ssp. incana formed nodules with all five Frankia inocula whereas C. cunninghamiana formed nodules with only two. A range of response from ineffectiveness in N2 fixation to high effectiveness was observed between Casuarina species ‐ Frankia source combinations. Strains of Frankia highly effective on one species were frequently ineffective on the other. Effectiveness was related to nodule development after infection and to the ability of developed nodules to fix N2.
Key concepts: Frankia, Casuarina, Casuarina equisetifolia, Biology, Nitrogen fixation, Botany, Root nodule, Actinorhizal plant