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The Journal of Heredity 1996:87(6):469-473
© 1996 The American Genetic Association 87:469-473

research-article

Electrophoretic Evidence for Tetrasomic Inheritance in the Dioecious Tree Maclura pomifera (Raf.) Schneid

R. H. Laushman, A. Schnable, J. L. Hamrick, H. Laushman, A. Schnable, and J. L. Hamrick

Corresponding Editor: William M. Cheliak

Abstract

Although polyploidy is recognized as an important feature of chromosomal evolution, natural autopolyploids rarely occur compared to allopolyploids. Enzymes coded by four electrophoretic loci (Lap, Pgm-1, Pgi-2, and Tpi-2) in adults and full-sib progenty indicate tetrasomic inheritance in the dioecious tree Macura pomifera, strongly suggesting that this species is an autopolyploid. This study is the first to document tetrasomic inheritance in a dioecious tree. Five of 19 segregation arrays deviated significantly from expected tetrasomic ratios, whereas 11 of 19 deviated significantly from digenic disomic expectations. We observed 22 double-reduction genotypes, which provides a likely source of devistion from expected tetrasomic frequencies. We suggets that unusual patterns of sexual expression in this species are related to autopolypliody through production of unbalanced sex chromosome ratios.


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