Abstract
Infection of alfalfa (Medicago sativa) with its bacterial symbiont Rhizobium meliloti results in the formation of root nodules, specialized organs within which the rhizobia fix nitrogen. The nodule tissues arise from a nodule meristem which forms when non-proliferating root cells are induced by the Rhizobium to dedifferentiate and begin dividing. The development of effective, nitrogen-fixing root nodules is a multistep process requiring genetic input from both the legume host and the bacterial symbiont. Both bacterial and plant mutants that block nodule formation at different morphological stages have been isolated (for reviews, see Vincent 1980; Verma and Long 1983). Plant and bacterial mutants also affect the biochemical development of the nodule as assayed by enzyme activities (Groat and Vance 1981), or by the accumulation of nodule-specific RNAs (Fuller et al. 1983) and polypeptides (Bisseling et al. 1983; Lang-Unnasch and Ausubel 1985). In this paper we describe the biochemical development of a...
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