Abstract
Four accessions of Agropyron drobovii Nevski were introduced into the United States in 1965 from a subrange of the Tien-Shan Mountains in Uzbek Soviet Socialist Republic. A study was undertaken at Logan, Utah, to determine how A. drobovii reproduces, to describe its cytogenetic characteristics, and to determine its genomic and phylogenetic relationships with five other Agropyron species through genome analysis of their F1 hybrids. Seed set was abundant when the plants were pollinated by their own pollen, demonstrating that A. drobovii is self-fertile All plants were 2n = 42 and behaved cytologically as strict alloploids with three distinct genomes. Hybrids were easily obtained between A drobovii and the following species with known genome formulas: A. libanoticum Hack, 2n = 14, SS; A dasystachyum (Hook) Scribn, 2n = 28, SSHH; A mutabile Drob., 2n = 28, SSHH; A. ugamicum Drob., 2n = 28, SSYY; and A leptourum (Nevski) Grossh, 2n = 42, SSSSHH. Chromosome pairing in the five sets of hybrids demonstrated that ...
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