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Alien Chromosome Controlling Sporophytic Sterility in Common Wheat¹

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. F₁ 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 F₁ plants, and 3) the male gametes without the critical alien chromosome were not transmitted.

Key Words: Male and female sterility • Preferential transmission • Chromosome substitution • Tricum aestivum L. em Thell.

² Professor of agronomy, North Dakota State Univ., Fargo, ND 58102.

Received for publication December 1, 1975.