"'Carnation Nou No.1', a carnation [Dianthus caryophyllus] breeding line resistant to bacterial wilt (Burkholderia caryophylli)."
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Dianthus
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ナス科作物にとって深刻な土壌病害である青枯病抵抗性の台木品種の育成を試み,抵抗性を有するMZC-180系統および育成系統(試交1~6号)に接種検定を行い,抵抗性の評価について検討を行った.青枯病菌2-d菌株を用いた接種検定では,MZC-180および育成系統試交1~6号の6系統は,供試したピーマンの栽培品種より顕著に強い抵抗性を有していることが認められた.ピーマン台木用品種である'台助'との比較では,MZC-180および試交3~6号はより強い抵抗性を示した.また,青枯病菌5株を用いた接種検定では,MZC-180および試交3~6号は'台助'や他のナス科植物と比較して強い抵抗性を示した.
Capsicum annuum
Bacterial wilt
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Bacterial wilt
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Gladiolus
Germ plasm
Iridaceae
Rust (programming language)
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One of the most important phytosanitary problems of the carnation crops in Colombia and in the entire world is vascular wilting produced by Fusarium oxysporum f.sp. dianthi. Currently, an effective treatment against the pathogen does not exist; the search for resistant varieties has been the most successful method for control of this disease. Breeding programs are vital to solving the problem of the carnation fusariosis. The objective of this research was the phenotypic evaluation of carnation F1 populations, products of contrasting crossing, resistant per susceptible to F. oxysporum f.sp. dianthi, in order to determine if the resistance is inherited in the lines. This information will contribute to the selection of material and to the successful introduction of the resistant characteristic, whose expression is commercially acceptable, to the gene pool. The methodology adopted was a phenotypic evaluation of the response to the parasite in the population (450 individuals) and in the parental. This evaluation estimated the area under the curve (AUDPC), using a scale of symptoms reported for carnation vascular wilt. Three different phenotypes were established with this evaluation. The moderately susceptible one is the predominant phenotype and an analysis of phenotypic frequencies was carried out on it. The results show that the individuals of the evaluated F1 population were distributed between two extreme ranges, resistant and susceptible; this shows that there is segregation for the trait resistant to F. oxysporum f.sp dianthi. We did not observe clearly differentiated classes, i.e. with complete absence or presence of the disease, indicating a possible control of the resistance in the evaluated carnation material, governed by more than one gene and with a possible additive genetic action.
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This chapter provides an overview of the evaluation of species and cultivar fire blight (Erwinia amylovora) susceptibility (including fruit scion and rootstock cultivars of apples and pears, and ornamentals including Cotoneaster, Pyracantha and Crataegus); breeding programmes (particularly inoculum development, pear scion breeding programmes, apple scion breeding programmes, rootstock breeding, ornamental breeding, somaclonal variation and mutation breeding); and breeding strategies (e.g. plant exploration, progeny size determination, selection of parents, and succession of crosses).
Fire blight
Ornamental plant
Mutation Breeding
Breeding program
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