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Cytogenetics and Breeding Behavior of a Hexaploid Agrotricum Immune from Wheat Streak Mosaic Virus¹

A breeding line of spring wheat, C.I. 15092, selected from Triticum aestivum L. em Thell./Agropyron intermedium (Host) Beauv. bred true for immunity from wheat streak mosaic virus (WSMV). F₁ hybrids of C.I. 15092/T. aestivum ‘Fletcher’ had 20 paired and 2 unpaired chromosomes of unequal size at metaphase I of meiosis in pollen mother cells. Apparently C.I. 15092 had one Agropyron chromosome pair carrying genes for immunity from WSMV substituted for a homoeologous wheat chromosome pair. Immunity from WSMV was completely dominant in hybrids. Inheritance data indicated that the Agropyron chromosome was transmitted through 27% male and 21% female gametes of the F₁ hybrid C.I. 15092/Fletcher. A small number of immune F₂ and F₃ plants were comparable to control plants in seed set, indicating that the whole Agropyron chromosome added to the wheat complement was not strikingly harmful in some plants, at least, not to self-fertility.

Key Words: Disomic substitution • Univalent transmission • Agropyron intermedium

² Assistant in Plant Science, Professor, and Professor, Plant Science Department, South Dakota State University, Brookings, SD 57006.

Received for publication October 19, 1973.