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actinorhizal plant
Actinorhizal plants are a group of angiosperms characterized by their ability to form a symbiosis with the nitrogen fixing actinobacteria ''Frankia''. This association leads to the formation of nitrogen-fixing root nodules.
==Classification==
Actinorhizal plants are dicotyledons distributed among three angiosperm orders (Fagales, Cucurbitales and Rosales), 8 families and 24 genera (Betulaceae: ''Alnus''; Casuarinaceae: ''Gymnostoma'', ''Casuarina'', ''Allocasuarina'', ''Ceuthostoma''; Coriariaceae: ''Coriaria''; Datiscaceae: ''Datisca'', Elaeagnaceae: ''Elaeagnus'', ''Hippophae'', ''Shepherdia''; Myricaceae: ''Myrica'', ''Comptonia''; Rhamnaceae: ''Colletia'', ''Discaria'', ''Kenthrothammus'', ''Retanilla'', ''Talguenea'', ''Trevoa'', ''Ceanothus''; Rosaceae: ''Dryas'', ''Purshia'', ''Cowania'', ''Cercocarpus'', ''Chamaebatia''). These three orders form a single clade within the Rosids, which is a sister taxon to the other major nitrogen-fixing order, the Fabales. All actinorhizal species are trees or shrubs, except for the genus ''Datisca''.
Many are common plants in temperate regions like alder, bayberry, sweetfern, Avens, mountain misery and ''Coriaria''. Some ''Elaeagnus'' species and Sea-buckthorns produce edible fruit. In tropical regions, ''Casuarinas'' are widely cultivated, becoming invasive species in some areas like ''Casuarina glauca'' in Florida.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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