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Published in Crop Sci 9:176-179 (1969)
© 1969 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Behavior, Transmission, and Morphological Effects of Accessory Chromosomes in Panicum coloratum L.1

B. L. Burson and E. C. Bashaw2

Accessory chromosomes in Panicum coloratum L. were approximately half the size of a univalent and resembled the normal chromosomes in general appearance, stain reaction, and typical distribution at the metaphase plate. Accessory chromosomes did not pair with each other but were frequently associated with members of the normal complement. Occasionally the accessories underwent precocious and continued division during meiosis I, resulting in a large accumulation by anaphase I. Accessory chromosomes were transmitted in limited numbers through male and female gametes. Few progeny received more than one accessory and none had more than two. The results suggested some type of gametic selection favoring gametes with few or no accessories. Accessory chromosomes had no appreciable influence on fertility or morphology. Apparently, they are either inert or sub-inert, or they were not present in sufficient quantity to exert a major influence.

Key Words: Gametes • Kleingrass • Meiosis

1 Cooperative investigations at College Station, Texas, of the Crops Research Division, Agricultural Research Service, U. S. Department of Agriculture, and the Department of Soil and Crop Sciences, Texas Agricultural Experiment Station, College Station. Adapted from a dissertation sumitted by the senior author in partial fulfillment of the requirements for the Ph.D. degree at Texas A&M University.

2 Formerly Research Assistant, Department of Soil and Crop Sciences, Texas A&M University, College Station, (presently Assistant Agronomist, Mississippi State University, State College 39762); and Research Geneticist, Crops Research Division, ARS, USDA, College Station, Texas.

Received for publication July 25, 1968.




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