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Symbiotic properties of Lotus pedunculitis root nodules induced by Rhizobium loti and Bradyrhizobium sp. ( Lotus )
Author(s) -
Vance Carroll P.,
Reibach Paul H.,
Pankhurst Clive E.
Publication year - 1987
Publication title -
physiologia plantarum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.351
H-Index - 146
eISSN - 1399-3054
pISSN - 0031-9317
DOI - 10.1111/j.1399-3054.1987.tb09221.x
Subject(s) - xylem , lotus , biology , symbiosis , bradyrhizobium , shoot , root nodule , rhizobium , lotus japonicus , nitrogen fixation , botany , azolla , bradyrhizobium japonicum , nodule (geology) , inoculation , rhizobiaceae , horticulture , bacteria , paleontology , genetics
Vance, C. P., Reibach, P. H. and Pankhurst, C. E. 1987. Symbiotic properties of Lotus pedunculatus root nodules induced by Rhizobium loti and Bradyrhizobium sp. ( Lotus ). Symbiotic properties of root nodules were evaluated in glasshouse‐grown Lotus pedunculatus Cav. cv. Maku inoculated with either a fast‐growing Rhizobium loti strain NZP2037 or a slow‐growing Bradyrhizobium sp. ( Lotus ) strain CC814s. Although the nodule mass of plants inoculated with NZP2037 was twice that of plants inoculated with CC814s, the yield of NZP2037 shoots and roots was 50% that of CC814s shoots and roots. Nodules induced by Bradyrhizobium fixed substantially more N than nodules induced by R. loti. Glucose requirements [mol glucose (mol N 2 fixed) ‐1 ] of nodules induced by CC814s and NZP2037 were 7.1 and 16.6, respectively. Nodule enzymes of carbon and nitrogen assimilation reflected the disparity of the two sym‐bioses. Xylem sap of the symbiosis with the higher yield contained a higher concentration of asparagine [9.86 μmol (ml xylem sap)‘] than did the lower yielding symbiosis [5.80 umol (ml xylem sap)“’]. Nodule CO 2 fixation was directly linked to nodule N assimilation in both symbioses. The results indicate that the difference between the two symbioses extend to nodule N and C assimilation and whole plant N transport. The data support a role for host plant modulation of bacterial efficiency and assimilation of fixed N.