Abstract
The occurrence of constitutive nitrate reductase activity (NRA) was examined in 101 species from 25 tribes in the Leguminosae. Constitutive NRA was undetectable in all species from the sub-families Caesalpiniodeae and Mimosoideae. Within the Papilionoideae it occurred in root and shoot of Lotus uliginosus (Loteae) and leaves of all members of the tribe Phaseoleae but was absent in all other plants tested. For L. uliginosus, root and shoot activity was similar in light and darkness, but for Glycine max and Phaseolus vulgaris (both Phaseoleae) leaf activity was greater in light.
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