Agronomy Journal Journal of Natural Resources and Life Sciences Education
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Published online 1 March 1959
Published in Agron J 51:143-147 (1959)
© 1959 American Society of Agronomy
677 S. Segoe Rd., Madison, WI 53711 USA
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Growth and Morphological Characteristics of Induced Autotetraploids of Lespedeza Cuneata, L. Stipulacea and L. Striata, and Interfertility of These Species at Diploid and Tetraploid Levels1

R. M. Brinkley, C. H. Hanson and W. A. Cope2

Synopsis: The induced autotetraploids had larger leaflets, stems, flowers, and seeds and lower yields of hay and seed than the respective parental diploids. Progenies from chasmogamous flowers gave higher yields than progenies from cleistogamous flowers, indicating heterosis. Viable hybrids were not obtained from any of the various combinations of diploid and tetraploid matings attempted. In ovaries of the diploid mating of L. Stipulacea x L. cuneata collapse of the ovule began at about the sixth day. The endosperm appeared degenerate.

1 Joint contribution from the Crops Research Division, ARS, USDA, and the Department of Field Crops, North Carolina Agr. Exp. Sta., Raleigh. Journal Paper No. 925, North Carolina Agr. Exp. Sta.

2 Formerly Agronomist (Agent), Crops Research Division, ARS; Research Agronomist, Crops Research Division, ARS (formerly Research Associate Professor of Field Crops, N. C. Agr. Exp. Sta.); and Research Agronomist, Crops Research Division, ARS, and Research Assistant Professor of Field Crops, N. C. Agr. Exp. Sta., respectively.

Received for publication June 24, 1958.




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Copyright © 1959 by the American Society of Agronomy.