Anter kültürü ile elde edilen bazı biber hatlarında kök boğazı yanıklığına (Phytophthora capsici Leon.) dayanıklılık ve diallel melezleme üzerinde araştırmalar
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1992
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Fen Bilimleri Enstitüsü
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The aim of this study was to determine the degree of resistance of eight dihaploid pepper lines obtained throught anther culture against Phytophthora root rot and mechanisma of resistance, to find out the whether there is any heterosis. For this, diallel crossing were made among eight dihaploid lines, two resistance lines (PM217 and PM702) and susceptable Kandil variety of pepper. Through these crossing 110 Fi and 11 parents were compa red after infection with Tokat solated through cuttud stemiv top method. According to the results, PM702 lines was found to be highly resistance among the test parents. This line was followed by 49 and PM217 lines. The parents followed after these lines were placed in two groups from resistance print of view. Generally the dihaploids coded as 55, 35 and 46 have similar degree of resistance whereas dihap loids coded as 65, 34, 47, 56 and Kandil variety were most susceptable genotypes under this research work. From three parameter (begin necros rate, minimum growth rate, and final necros length) point of view, lines like PM702, 49 and PM217 gave the best general combination ability value. No positive heterosis was found against P. capsici from resistance point of view. However negative heterosis was observed in 14 Fi for begin necros rate, 34 Fi for minimum growth rate and 30 Fi for final necros length. According to the calculated general and specifik combination ability, character of resistance against P. capsici was dependent on additive effectiveness of genes. However this effect was more important than epis- tatic and dominant effects. Resistance to P. capsici was poligenic in character under this study. Key Words: Pepper,, Capsicum annuum, Phytophthora capsici, Phytophthora root rot, diallel crossing, general combination ability, specific combinationability, heterosis, genes effectives.
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