Section 6
Chapter 5,082

Cyto genetic analyses of auto poly ploids models and methods for tri ploids to octo ploids

Jackson, R.C.; Casey, J.

American Journal of Botany 69(4): 487-501


ISSN/ISBN: 0002-9122
DOI: 10.2307/2443057
Accession: 005081507

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Methods are presented for determining the frequencies and numbers of various meiotic configurations expected in autopolyploids. Polyploids of unknown origin can be tested for agreement with expected meiotic configurations. Rejection of the autoploid hypothesis may indicate the presence of Ph-like genes or some type of alloploid. The models consider mean chiasma frequencies of 2, 3 and 4 per bivalent for triploids and tetraploids and 2 per bivalent for pentaploids, hexaploids, heptaploids and octoploids. Literature data for a known autotriploid, autotetraploids, allotetraploids and allopentaploids were tested against expectations of the models. There was generally good agreement between number of observed autoploid meiotic configuration and those expected in the models. [Applications to evolution are discussed.].

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