Electrophoretic evidence for tetrasomic inheritance in the dioecious tree Maclura pomifer (Raf.) Schneid
1996
Laushman, R.H. | Schnabel, A. | Hamrick, J.L.
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 progeny indicate tetrasomic inheritance in the dioecious tree Maclura 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 deviation from expected tetrasomic frequencies. We suggest that unusual patterns of sexual expression in this species are related to autopolyploidy through production of unbalanced sex chromosome ratios.
اظهر المزيد [+] اقل [-]الكلمات المفتاحية الخاصة بالمكنز الزراعي (أجروفوك)
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