AN ANALYSIS OF SEED DEVELOPMENT IN PISUM-SATIVUM .17. THE EFFECT OF THE RB LOCUS ALONE AND IN COMBINATION WITH R ON THE GROWTH AND DEVELOPMENT OF THE SEED

Near-isogenic lines have been produced in pea to examine the effects o f genes at the r and rb loci on the growth and development of the seed . The rb alleles were found to have an effect on the growth of the tes ta as well as on that of the embryo in contrast to those at the r locu s which only affect the latter. The relationship between the fresh and dry weights of the embryos of rb isoline and the double mutant differ ed from that of the round-seeded wild-type line. Furthermore, for this relationship, the double mutant line very closely resembled the rr is oline.