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  1. 2 Journal of Applied Genetics

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  1. 1 2001

  2. 1 1999

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  1. 2 Kozik E. U.

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1

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

100%
Kozik E. U.
Journal of Applied Genetics
|
2001
|
vol. 42
|
issue 1
33-42
EN
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.
2

Inheritance of resistance to powdery mildew (Oidium lycopersicum Cooke & Massee, emend. Noordeloos & Loerakker) in accessions of three wild species of Lycopersicon

100%
Kozik E. U.
|
|
issue 3
175-183
EN
Three resistant accessions: L. hirsutum LA1775, L. pennellii LA716, L. chilense LA2747, and the susceptible breeding line A100, were crossed to develop F1, F2 and BC1 populations for genetic analysis of tomato resistance to Oidium lycopersicum Cooke & Massee, emend. Noordeloos & Loerakker, the causal agent of powdery mildew. The resistances in all the studied wild species of Lycopersicon were dominant, but controlled by different numbers of genes depending on the source of resistance. Two incompletely dominant genes control the resistance in L. hirsutum, but one major gene has a stronger expression than the second minor gene. L. pennellii carries three cumulative dominant genes. The resistance of L. chilense is governed by one partially dominant gene that is less effective than the resistance genes of L. hirsutum.
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