Alien Chromosome Controlling Sporophytic Sterility in Common Wheat 1

Common wheat plants ( Triticum aestivum L. em Thell.) having a monosomic or a disomic substitution (2n=42;20″+l′+l′ or 2n=42;20+l″, respectively) of an Aegilops longissima S. & M. chromosome were crossed as males to a set of ‘Chinese Spring’ telosomic or isosomic stocks. F 1 plants were examined for kernels/spike, meiotic chromosome number, and chromosome pairing relationships. Results indicated that: 1) the afien chromosome was homoeologous to and substituted for 4A of wheat, 2) the missing wheat chromosome arms did not influence the sporophytic control of sterility of F 1 plants, and 3) the male gametes without the critical alien chromosome were not transmitted.