Genotype x environment interactions for resistance to common scab in tetraploid potato

• Published in: Crop science Vol. 37; no. 4; pp. 1163 - 1167
• Main Authors: Haynes, K.G, Goth, R.W, Young, R.J
• Format: Journal Article
• Language: English
• Published: Madison, WI Crop Science Society of America 01-07-1997; American Society of Agronomy
• Subjects: Agriculture; Agronomy. Soil science and plant productions; AREA DE SUPERFICIE; Bacterial diseases of plants; Biological and medical sciences; CULTIVARS; Disease; DISEASE RESISTANCE; Diseases and pests; ENFERMEDADES DE LAS PLANTAS; Environment; ESTABILIDAD GENETICA; Fundamental and applied biological sciences. Psychology; GENETIC RESISTANCE; GENETIC STABILITY; Genetics; Genetics and breeding of economic plants; GENOTIPOS; GENOTYPE; GENOTYPE ENVIRONMENT INTERACTION; GENOTYPES; HEREDABILIDAD; HERITABILITE; HERITABILITY; INTERACCION GENOTIPO AMBIENTE; INTERACTION GENOTYPE ENVIRONNEMENT; Lesions; MAINE; MALADIE DES PLANTES; Pest resistance; PLANT DISEASES; Plant pathogens; Potatoes; Prevention; RESISTANCE AUX MALADIES; RESISTANCE GENETIQUE; RESISTENCIA A LA ENFERMEDAD; RESISTENCIA GENETICA; SELECCION; SELECTION; SELECTION PRESSURE; SINTOMAS; SOLANUM TUBEROSUM; STABILITE GENETIQUE; STREPTOMYCES SCABIES; SURFACE; SURFACE AREA; SYMPTOME; SYMPTOMS; TETRAPLOIDIA; TETRAPLOIDIE; TETRAPLOIDY; TUBERCULE; TUBERCULO; TUBERS; VARIEDADES; Varietal selection. Specialized plant breeding, plant breeding aims; VARIETE; VARIETIES; VIRGINIE OCCIDENTALE; WEST VIRGINIA; United States; North America; Maine; America; Streptomycetaceae; Genetic variability; Plant pathogen; Solanum tuberosum; Actinomycetales; Tetraploidy; Disease resistance; Area; Sensitivity resistance; Genotype environment interaction; Streptomyces scabies; Dicotyledones; Angiospermae; Bacteria; Actinomycetes; Spermatophyta; Heritability; Tuber plant; Solanaceae; Lesion
• ISSN: 0011-183X; 1435-0653
• DOI: 10.2135/cropsci1997.0011183X003700040023x

Common scab of potato (Solanum tuberosum L.), caused by the soil-borne bacterium Streptomyces scabies (Thaxter) Lambert and Loria, is an economically important potato disease. Tubers from susceptible plants may have superficial, raised, or pitted lesions. Quantitative methods to evaluate tubers for the amount of surface area covered (AI) and the type of lesion (LI) have previously been developed. The purposes of this study were to (i) estimate broad-sense heritability on a mean basis for scab resistance in a tetraploid population of Solanum tuberosum for AI and LI, (ii) determine the importance of genotype x environment interactions on AI and LI, and (iii) determine the stability of potato genotypes for scab resistance. In 1992 and 1993, 23 potato clones were grown in replicated scab-infested field plots in Presque Isle, ME, and Cranesville, WV, and rated for AI and LI. There were significant environment, genotype, and genotype x environment effects for AI and LI. Broad-sense heritabilities on a mean basis and their exact 95% confidence intervals for AI and LI were estimated as 0.89 (0.78, 0.95) and 0.93 (0.86, 0.97). respectively. Shukla's stability-variance statistics indicated that the most scab resistant genotypes were the most unstable, whereas, the most susceptible genotypes were the most stable. Thus, disease pressure was intense. Moderate levels of scab resistance were found. However, to obtain genotypes with high levels of scab resistance that are stable across environments will probably require development of populations incorporating new sources of scab resistant germplasm