Inheritance of resistance to anthracnose (Colletotrichum capsici) at seedling and fruiting stages in chili pepper (Capsicum spp.)

• Published in: Plant breeding Vol. 128; no. 6; pp. 701 - 706
• Main Authors: Mahasuk, P, Khumpeng, N, Wasee, S, Taylor, P.W.J, Mongkolporn, O
• Format: Journal Article
• Language: English
• Published: Oxford, UK Oxford, UK : Blackwell Publishing Ltd 01-12-2009; Blackwell Publishing Ltd; Blackwell
• Subjects: Agronomy. Soil science and plant productions; anthracnose resistance; Biological and medical sciences; Capsicum annuum; Capsicum chinense; chili fruit maturity; Colletotrichum capsici; Fundamental and applied biological sciences. Psychology; Genetics and breeding of economic plants; Pest resistance; Plant pathogens; Varietal selection. Specialized plant breeding, plant breeding aims; Fruit; Mycosis; Plant juvenile growth stage; Genetic determinism; Fungus resistance; Fungi; Infection; chili fruit maturity; Colletotrichum capsici; anthracnose resistance; Vegetable crop; Dicotyledones; Angiospermae; Genetic improvement; Capsicum chinense; Flavoring crop; Capsicum annuum; Spermatophyta; Fungi Imperfecti; Solanaceae; Maturity; Chilli pepper; Fructification
• ISSN: 0179-9541; 1439-0523
• DOI: 10.1111/j.1439-0523.2008.01615.x

Inheritance of resistance to anthracnose at fruiting and seedling stages was studied in two F₂ populations from a cross between Capsicum annuum cv. 'Bangchang' and Capsicum chinense'PBC932'. The first F₂ was used to study anthracnose resistance at fruiting stage on mature green and ripe red fruit, and the second F₂ was used to study the resistance at both seedling and fruiting stages. Fruit inoculation was performed on detached fruit using a microinjector. Disease severity was assessed on a 0-9 scale at 7 days after inoculation. Seedling inoculation was performed using a drop method on detached leaves of 4-week-old seedlings. Disease severity was assessed on a 1-9 scale at 3 days after inoculation. The distribution of the disease scores of green and red fruit, and seedlings in both F₂ populations suggested a single gene model for each trait. Three different recessive genes were responsible for the three resistances from this cross. Linkage analysis suggested that the resistances at green and red fruit were linked (recombination frequency 0.25), and that the seedling resistance was not linked to the fruit resistances.