Crop Science Journal of Natural Resources and Life Sciences Education
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Published in Crop Sci 8:744-747 (1968)
© 1968 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Pachytene Chromosomes of Diploid Medicago sativa L.1

G. R. Buss and R. W. Cleveland2

Chromosomes at the pachytene meiotic stage of microsporocytes were measured and characterized in diploid Medicago sativa L. (2n = 16). An idiogram for the eight chromosomes of the haploid complement was constructed including the following details: average total lengths, arm lengths:, arm length ratios (long arm ÷ short arm lengths), and number, position, and size of chromatic areas. The chromosome lengths of the complement ranged from 25.4 to 40.1 microns, and arm length ratio ranged from 1.19 to 3.06. Large degrees of variability in length measurements from cell to cell were noted. Similarly, arm length ratios were also variable, but to a lesser degree. Because of the variability from cell to cell, absolute length was not reliable as an identification criterion. Relative lengths (within the cell), arm length ratios, and chromatic area patterns formed reliable criteria for identification of chromosomes when taken in combination.

Key Words: Karyotype Analysis • Pachytene Chromosome Morphology • Diploid Alfalfa (Medicago Sativa L.

1 Contribution from the Department of Agronomy, The Pennsylvania State University, University Park, Pa. 16802. Entered as paper No. 3409 in the journal series of the Pennsylvania Agricultural Experiment Station on May 1, 1968. Part of a thesis submitted by the senior author in partial fulfillment of the requirements for the Ph.D. degree.

2 Formerly Graduate Research Assistant (now Assistant Professor of Agronomy, Virginia Polytechnic Institute, Blacksburg, Va. 24061) and Associate Professor of Agronomy, respectively.

Received for publication June 14, 1968.




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