A Mutation inVicia fabaResults in Ineffective Nodules with Impaired Bacteroid Differentiation and Reduced Synthesis of Late Nodulins

Abstract

Although numerous reports have documented the effect of bacterially-induced ineffectiveness on root nodule structure, function, and plant gene expression, few studies have detailed the effect of the plant genome on similar parameters. In this report effective (N 2 -fixing) broadbean (Vicia faba L.) and plant-controlled ineffectivc (non-N 2 -fixing) broadbenn recessive for the sym-1 gene were compared for nodule structure, developmental expression of nodule enzyme activities, enzyme proteins, and mRNAs involved in a assimilation, leghemoglobin (Lb) synthesis, and acetylene reduction activity (ARA)