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Published online 1 February 1957
Published in Agron J 49:83-88 (1957)
© 1957 American Society of Agronomy
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Cytogenetics of Interspecific Hybrids in the Bromopsis Section of Bromus. II. Triploid Hybrids and their Amphiploid Derivatives1

F. L. Barnett2

Synopsis: Hybrids between diploid and tettaploid Bromopsis species of Bromus were generally more vigorous than their parents. In most morphological aspects, however, they were intermediate. At MI they exhibited mean frequencies of 6.66 to 9.63 univalents and 4.78 to 5.48 bivalents per cell. Trivalents were moderately common at MI, and high frequencies of irregularity occurred in AI and quartet stages. All triploid hybrids were highly sterile. Artificial amphiploids obtained through chromosome doubling from the triploid hybrids showed bivalent frequencies of 18.93 to 20.10 per MI cell. Univalents, trivalents, and quadrivalents were moderately common in these forms. The amphiploids varied considerably in fertility.

1 Contribution No. 151 of the U. S. Regional Pasture Research Laboratory, Field Crops Research Branch, ARS, USDA, State College, Penn., in cooperation with the 12 Northeastern States. Authorized for publication July 25, 1956 as paper No. 2077 in the Journal Series of the Pennsylvania Agr. Exp. Sta. This paper is a condensation of part of a Ph.D. thesis submitted to The Pennsylvania State University. The writer is indebted to Dr. A. A. Hanson, who suggested the problem and made some of the first crosses and to Drs. H. L. Carnahan and Helen D. Hill for advice and critical reading of the manuscript.

2 Agent. Present address, Agronomy Department, Kansas State College, Manhattan, Kan.

Received for publication August 20, 1956.




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Copyright © 1957 by the American Society of Agronomy.