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This article in CS

  1. Vol. 9 No. 2, p. 176-179
     
    Received: July 25, 1968
    Published: Mar, 1969


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doi:10.2135/cropsci1969.0011183X000900020020x

Behavior, Transmission, and Morphological Effects of Accessory Chromosomes in Panicum coloratum L.1

  1. B. L. Burson and
  2. E. C. Bashaw2

Abstract

Abstract

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.

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