Host-Bradyrhizobium relationships and nitrogen-fixation in the Bambarra groundnut [Voandzeia subterranea (L.) Thouvars nom. cons.]
1990
Somasegaran, P. | Abaidoo, R.C. | Kumaga, F. (Hawaii Univ., Paia, Hawaii (USA). NifTAL Project)
23 strains of rhizobia, from 14 leguminous species, were evaluated on a Thai cultivar of Voandzeia* in Leonard jar trials. The symbiosis ranged from completely ineffective through moderate effectiveness to fully effective. Bradyrhisobium sp. TAL 169, isolated from Vigna unguiculata, ranked most-effective; the wide-spectrum Bradyrhizobium strain CB 756 was ineffective. In a cultivar x Bradyrhizobium spp. trial, the host-genotype significantly (P is less than or equal to 0.01 or P is less than or equal to 0.001) influenced shoot dry weight, shoot N, nodule dry weight and nitrogenase activity. The rhizobial strains were also significant sources of variation for shoot-dry weight (P=0.05), shoot N (P 0.001) and nodule dry weight (P 0.01). There were no significant host x Rhizobium interactions, indicating that no specific combination was superior over the broad range of all treatments. Percentage shoot N and specific nitrogenase activity were poor indicators of N2 fixation capacity in Voandzeia. Voandzeia cultivar No. 12 P.P. Rust in combination with Bradyrhizobium sp. TAL 169 showed high potential for growth, nodulation and N2 fixation. This study indicated that Voandzeia is specific for its rhizobial requirement for effective symbiosis.
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