|Authors: ||Y. LESPINASSE, J.M. LESPINASSE, B. GANNE|
Economic characters are usually inherited in a complex manner.
A good plant breeding methodology requires to find parents and progenies with the best expression of these characters.
For example, the inheritance of 2 characters is explained:
- Inheritance of compact type habit ; 'Granny Smith Standard' and 'Granny Smith Compact' are crossed with a same female parent.
In this variety the compact type mutation is polygenically inherited ; a table with 20 drawings combining fruiting habit and growth characteristics is proposed to assess and classify the different phenotypes.
Other results are discussed.
- Inheritance of fruit colour ; the progeny of 'Richared Delicious' × 'Reinette de Landsberg' is compared to 'Idared' × 'Golden Delicious'. In the first progeny, 'Richared' × 'Reinette de Landsberg', a clear-cut difference was found between red apples, yellow apples and russeted apples.
A simple explanation involving 3 independent genes - A, B and C - is proposed to explain the results: 2 dominant complementary genes leading to the yellow phenotype, A and B - only one of the 2 genes, A or B, for the red phenotype - russeted type requires a third dominant gene, C, only expressed in presence of the recessive genes, a and b.
This hypothesis for fruit colour inheritance is discussed with other results.
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