Abstract
Allozyme markers were used to test for tetrasomic inheritance (versus monogenic-disomic or digenic-disomic inheritance) in a naturally occurring autotetraploid population of Allium nevii (Alliaceae). Twenty progenies representing both di-allelic and tri-allelic plants were studied for segregation at three loci (Adh1. Fe2. and Idh2). All the progenies segregated according to the expected ratios for tetrasomic inheritance of codominant genes, assuming chromosomal segregation. The monogenic-disomic model of inheritance was easily rejected by x2 tests. However, only by pooling progeny arrays from di-allelic symmetric heterozygous parents was it possible to statistically reject the digenic-disomic model of inheritance for the three loci analyzed. The present study therefore provides further evidence for an autotetraploid origin of tetraploid A. nevii and is an important addition to a growing body of literature suggesting autopolyploidy and polysomic inheritance may be more frequent in natural plant populations than has previously been hypothesized.
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