Summary
A comparison is made between Rhizobium leguminosarum strains PRE, effective on both pea and broad bean, and PF2, effective on pea and almost ineffective on broad bean. The former develops regular, branched bacteroids on both hosts. Strain PF2 on pea first develops regular bacteroids which then become spherical. On broad bean, PF2 remains mostly in the rod form though few branched bacteroids are present. Other strains which show the same host-induced morphogenetic development as PF2 are all effective on pea and almost ineffective on broad bean.
Strains PF2 has a labile structure which causes a problem during the preparation of bacteroid suspensions. Mercaptoethanol increases ethylene production by PF2 nodule brei but not by PRE nodule brei. Also sonication strongly increases ethylene production by PF2 nodule brei, and inhibits ethylene production by PRE nodule brei. Molybdenum content of both PRE and PF2 cells (including both bacteroids and bacterial cells) of broad bean nodules is the same. Morphological forms do not seem to be related with nitrogenase activity.
The manuscript was prepared for publication by members of the department.
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This study was carried out by the late E. H. R. van den Berg (1942–1974) in the Laboratory of Microbiology at Wageningen in partial fulfilment of the requirements for the degree of Doctor of Sciences
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Van den Berg, E.H.R. The effectiveness of the symbiosis of Rhizobium leguminosarum on pea and broad bean. Plant Soil 48, 629–639 (1977). https://doi.org/10.1007/BF00145773
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DOI: https://doi.org/10.1007/BF00145773