INHERITANCE OF TWO AGRONOMICAL CHARACTERS IN THE APPLE TREE (MALUS PUMILA MILL.) : COMPACT TYPE HABIT AND FRUIT COLOUR.
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.
LESPINASSE, Y., LESPINASSE, J.M. and GANNE, B. (1985). INHERITANCE OF TWO AGRONOMICAL CHARACTERS IN THE APPLE TREE (MALUS PUMILA MILL.) : COMPACT TYPE HABIT AND FRUIT COLOUR.. Acta Hortic. 159, 35-48