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Symbiotic Functioning and Photosynthetic Rates Induced by Rhizobia Associated with Jack Bean (Canavalia ensiformis L.) Nodulation in Eswatini
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Symbiotic Functioning and Photosynthetic Rates Induced by Rhizobia Associated with Jack Bean (Canavalia ensiformis L.) Nodulation in Eswatini
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Journal Article
Symbiotic Functioning and Photosynthetic Rates Induced by Rhizobia Associated with Jack Bean (Canavalia ensiformis L.) Nodulation in Eswatini
2023
Overview
Improving the efficiency of the legume–rhizobia symbiosis in African soils for increased grain yield would require the use of highly effective strains capable of nodulating a wide range of legume plants. This study assessed the photosynthetic functioning, N2 fixation, relative symbiotic effectiveness (%RSE) and C assimilation of 22 jack bean (Canavalia ensiformis L.) microsymbionts in Eswatini soils as a first step to identifying superior isolates for inoculant production. The results showed variable nodule number, nodule dry matter, shoot biomass and photosynthetic rates among the strains tested under glasshouse conditions. Both symbiotic parameters and C accumulation differed among the test isolates at the shoot, root and whole-plant levels. Although 7 of the 22 jack bean isolates showed much greater relative symbiotic efficiency than the commercial Bradyrhizobium strain XS21, only one isolate (TUTCEeS2) was statistically superior to the inoculant strain, which indicates its potential for use in inoculant formulation after field testing. Furthermore, the isolates that recorded high %RSE elicited greater amounts of fixed N.
