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A Possible Source of Cytoplasmic Male Sterility in Intermediate Wheat-Grass, Agropyron Intermedium (Host) Beauv¹

Amphidiploid Triticum durum Desf. x Agropyron intermedium (Host) Beauv. and T. durum x A. trichophorum (Link) Richt. hybrids were backcrossed twice A. intermedium and A. trichophorum. A pronounced increase in male sterility was observed in the series from the amphidiploid (AD) to the first and second substitution backcross generations (SB₁ and SB₂). Male sterility estimates averaged 53.4% in the AD, 83.6% in the SB₁ and 96.8% in the SB₂. Approximately 69% of all SB₂ plants were 99 to 100% male sterile.

Key Words: Triticum x Agropyron amphidiploids • Hybrid wheatgrass • Substitution backcross • Intergeneric hybrid

² Professor of Agronomy and Genetics, Department of Plant and Soil Science, Montana State University, Bozeman, Mont. 59715.

Received for publication November 3, 1969.