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A study was done to test whether inheritance is tetrasomic or disomic in tetraploid Fl hybrids between 2x  Vaccinium   elliottii  Chapm. and 4x  V .  corymbosum  L. Seventeen Fl hybrids derived from  V .  elliottii  homozygous for recessive anthocyanin deficiency (AD) were confirmed by isozyme analysis and, where  V.   elliottii  was the seed parent, by the presence of anthocyanin. Fertile hybrids with high pollen stainability were assumed to be 4x and duplex for the AD allele, having arisen from 2n gametes in  V .  elliottii . In nine Fl × Fl crosses, all progeny populations segregated for AD phenotype at or above the expected tetrasomic ratio of 1 AD:35 normal; no AD would be expected with disomic inheritance. Tetraploid AD progeny were used in testcrosses on sixteen Fl hybrids in 1991. Progeny segregated tetrasomically, 1 AD:5 normal. Isozyme loci PGD-2 and PGI-2 also segregated tetrasomically.

TETRASOMIC INHERITANCE OF ISOZYME AND PHENOTYPIC MARKERS IN ALLOTETRAPLOID BLUEBERRIES