rbc (EC 4.1.1.39) is a bifunctional enzyme involved in carbon fixation. It consists of eight chloroplast-encoded large subunits containing the active site and eight nuclear-encoded small subunits required for enzyme assembly and function (Akazawa et al., 1984). We report the isolation and analysis of a cDNA clone for the rbcS from Malus (Table I). A Malus leaf cDNA library (from an unclassified...