Agronomy Journal Journal of Natural Resources and Life Sciences Education
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Published online 1 February 1957
Published in Agron J 49:77-82 (1957)
© 1957 American Society of Agronomy
677 S. Segoe Rd., Madison, WI 53711 USA
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Cytogenetics of Interspecific Hybrids in the Bromopsis Section of Bromus. I. Diploid and Tetraploid Hybrids1

F. L. Barnett2

Synopsis: Diploid hybrids in the Bromopsis section of Bromus were, in general, morphologically intermediate, but instances of dominance and heterosis occurred. F1 tetraploid hybrids between B. ciliatus and B. frondosus segregated into dwarf, semi-dwarf, and normal types. Diploid hybrids showed mean bivalent frequencies of 6.50 to 6.79 per MI cell and little irregularity in AI and quartet stages. Mean bivalent frequencies of 12.33 to 12.81 and moderate frequencies of univalents, trivalents, and quadrivalents occurred in MI cells of F1 tetraploid hybrids. Diploid hybrids were highly sterile, but showed slight fertility as seed parents in backcrosses. Tetraploid hybrids exhibited low fertility under open-pollination.

1 Contribution No. 150 of the U. S. Regional Pasture Research Laboratory, Field Crops Research Branch, ARS, USDA, State College, Pa. in cooperation with 12 Northeastern States. Authorized for publication July 25, 1956 as paper No. 2076 in the Journal Series of the Pennsylvania Agri. 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, Kansas.

Received for publication August 20, 1956.




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Copyright © 1957 by the American Society of Agronomy.