Abstract
Publisher Summary This chapter discusses relationships between the mycorrhizal and actinorhizal symbioses in non-legumes. Some non-leguminous, nitrogen-fixing plants carry dual symbiotic infection involving both mycorrhizal fungi and actinorhizal actinomycetes. The characterization of the genus Frankia, the microsimbiont in the actinorhizal symbiosis, is approaching maturity but the optimal application of methods already developed requires the consideration of the real contribution of mycorrhiza associated with the actinorhizal symbioses. The chapter discusses mycorrhiza in actinorhizal plants. Mycorrhizal species are found in most actinorhizal plant genera so far examined in both ectomycorrhizal and vesicular-arbuscular mycorrhizal symbioses. The presence of a mycorrhizal symbiosis in a plant species depends largely on many soil characteristics. Thus, infection of Myrica gale by both ecto- and vesicular-arbuscular mycorrhiza is restricted to well-drained soils, being absent in wet soils. The actinorhizal symbioses are also highlighted in the chapter.
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