Abstract
Cytological and genetical studies are reported on the hybrid and later generations ofGossypium herbaceum (A1 genome) xG. triphyllum (Hg genome). Chromosome pairing between the two genomes was high, and their chromosomes are considered, with minor exceptions, to be strueturally similar. Studies of the F1 and segregating families showed thatG. triphyllum carries the complementary factorsR inf2 supΘS R infa supGO for petal spot,Ya(Yb) Y infc supP for cream petal,pa for cream pollen, andYap for depression of yellow petal pigment. Leaf ahape ofG. triphyllum was dominant to the leaf shape ofG. herbaceum. The blue petal color ofG. triphyllum was recovered only in the backeross of the F1 to this species.
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