PACHYTENE CHROMOSOMES OF THE POTATO (SOLANUM TUBEROSUM, GROUP ANDIGENA)

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Abstract
The morphology of the pachytene chromosomes of haploids (2n = 24) of Solanum tuberosum Group Andigena (2n = 48) is described. Chromosome identification is based primarily on the characteristics of chromatic regions, presence of distinct chromomere(s) in the achromatic regions, and the occurrence of prominent telochromomeres. Chromosomes V, XI and XII have approximately median centromeres. Chromosome II is associated with the nucleolus, and the variation in satellite size of this chromosome can be used as cytological marker for future studies. Comparisons of pachytene chromosomes from different haploids and their hybrids support the concept that the two genomes in Andigena are quite similar. The striking similarity between the potato and tomato chromosomes suggests interesting studies on the evolutionary relationships of these plants.
Funding Information
  • National Science Foundation
  • Rockefeller Foundation