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Towards the introducing of resistance to powdery mildew from Lycopersicon hirsutum into L. esculentum

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Kozik E. U.

Journal of Applied Genetics

2001

vol. 42

issue 1

33-42

Genes of resistance to Oidium lycopersicum from Lycopersicon hirsutum LA 1775 were introduced to L. esculentum. Breeding procedures were based on a one-way programme up to the F2 generation and then four different methods were adopted to obtain F4 and BC4 populations. Screening tests among those hybrid populations were performed in a greenhouse and showed segregation for resistance to powdery mildew due to different genetic backgrounds of the families derived from four breeding methods that changed the status of the gene/genes responsible for resistance to powdery mildew. F4 and BC4 populations varied in relation to morphological traits (fruit size and weight, seed and fruit productivity, number of locules). There was a significant progress in breeding in comparison to L. hirsutum regarding fruit size and weight, and the number of locules. Values of two other traits: seed and fruit productivity, that are correlated with self- and cross-compatibility, were low and similar to L. hirsutum. Therefore, another one or two backcrosses will probably improve seed and fruit productivity.

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1 Journal of Applied Genetics

1 2001

1 Kozik E. U.

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Towards the introducing of resistance to powdery mildew from Lycopersicon hirsutum into L. esculentum