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Karyology of Natural 4X, 6X and 8X Progenies of a Tetraploid (4X) Clone of Bromus inermis Leyss¹

Sypnosis: Plants of a 28-chromosome clone of bromegrass were interplanted in a nursery of 56-chromosome Bromus inermis. Progeny of the tetraploid clone included tetraploid, hexaploid and octoploid plants. The tetraploids were regular in meiosis, the hexaploids very irregular and the two octoploids fairly regular.

The meiotic data supported the hypothesis that Bromus inermis is autoploid for two basic genomes.

² Geneticist and Agronomist, respectively, Field Crops Research Branch, ARS, USDA. The writers are indebted to Dr. I. W. Knobloch for supplying the clone C-554 used in this study, and to Dr. R. W. Cleveland for valuable suggestions in the preparation of the manuscript.

Received for publication February 18, 1956.

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