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The Journal of Heredity 1984:75(1):23-26
© 1984 The American Genetic Association 75:23-26

research-article

Identification of chromosomes with secondary constrictions in Melilotus species

S. E. Schlarbaum, L. B. Johnson, H. J. Gorz, and F. A. Haskins

Department of Plant Pathology Throckmorton Hall, Kansas State University Manhattan, KS 66506
Department of Agronomy, University of Nebraska Lincoln, NE 68583
Department of Forestry, Wildlife and Fisheries University of Tennessee Knoxville, TN 37901

Please address reprint requests to Dr. S. E. Schlarbaum

Abstract

Secondary constrictions were determined in one chromosome pair in the complements of M. Infesta, M. macrocarpa, M. itallca (subgenus Micromelilotus), and M. alba and M. officinalis (subgenus Melilotus). The karyotypes of M. Infesta and M. macrocarpa were found to be similar. Chromosomes of M. italica were larger than the chromosomes of the other four Melilolotus species. The chromosome size in M. italica suggests the presence of large chromosomes in an ancestral or pro-Melilotus prototype. The chromosomes with satellites of M. infesta and M. macrocarpa appear to differ in morphology from the satellite chromosomes of M. alba and M. officalis by a paracentric inversion. The morphology of the satellite chromosomes in M. italica is thought to represent a more primitive type than in the other Melilotus species studied.


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