Models of inheritance of flower colour and extra petals in Potentilla fruticosa L.
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Inheritance models for flower colour and extra petals in Potentilla fruticosa L. were developed by conducting controlled crosses between different cultivars and advanced selections. Parents were crossed in all combinations and floral character segregation of progenies were recorded. Preliminary models for flower colour include two whitening genes (W1 and W2) and two yellowing genes (Y1 and Y2) with the action of a bleaching gene also implicated. The cyanic flower colour model developed involves background petal colour, cyanic pigments and distribution and temperature sensitivity genes. The extra petals model involves a two gene switch, D1 and D2 to turn on the production of up to five extra petals and a modifier gene, Dm that accounts for an additional one to five extra petals. Either D1 or D2 must be recessive to initiate extra petal production. Dm must also be recessive to enable production of an additional 1–5 petals.
Key wordsPotentilla fruticosa woody ornamentals flower colour genetics double flowers anthocyanins
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