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Samuel Mendlinger and Dov Pasternak

177 ORAL SESSION (Abstr. 701-708) CROSS-COMMODITY GENETICS III

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Edward J Ryder

56 ORAL SESSION 10 (Abstr. 457-464) Cross-commodity: Genetics & Breeding

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Edward J. Ryder

126 ORAL SESSION 39 (Abstr. 276-283) Vegetables: Breeding and Genetics

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Y.-K. Chen, J.P. Palta, and J.B. Bamberg

56 ORAL SESSION 10 (Abstr. 457-464) Cross-commodity: Genetics & Breeding

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Jianping Ren and Michael H. Dickson

101 POSTER SESSION 3A (Abstr. 127–158) Breeding & Genetics–Vegetables

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Deyuan Wang and Paul W. Bosland

Pepper (Capsicum spp.) is one of the most cultivated vegetable and spice crops in the world. Capsicum genetics have been extensively studied, but the most recent Capsicum gene list was published more than a decade ago. Since then, new genes have been described. This updated gene list provides detailed descriptions of genes, including the genes' characteristics, the genetic background of the mutants/lines, action mechanisms of genes, gene interactions, molecular markers, and chromosome localization when available. This new list includes 292 genes for morphological traits; physiological traits; sterility; and resistance to diseases, nematodes, and herbicides, which includes the 92 genes that have not been previously described.

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Ana Fita, Belén Picó, Antonio J. Monforte, and Fernando Nuez

. inodorus PS genetic background. This population has already been successfully used to study the genetics of fruit quality and postharvest physiological fruit disorders, even allowing the identification of QTL alleles with beneficial effects masked in the

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Norman F. Weeden

158 COLLOQUIUM 4 (Abstr. 650–652) 30+ Years of Molecular Genetics: How Far Have We Come and What Are the Major Challenges and Opportunities for Advancement?

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Roger L. Vallejo, Wanda W. Collins, and Rocco D. Schiavone

Preliminary data on the genetics of glandular trichomes and the feasibility of incorporating A and B glandular trichomes and polyphenol oxidase (PPO) activity from Solanum berthaultii Hawkes (Ber) into an advanced S. phureja Juz. et Buk.-S. stenotomum Juz. (Phu-Stn) diploid potato population are presented. A random sample of four Phu-Stn clones was intercrossed with a sample of three Ber progenies (pollen bulk per progeny) segregating for high density of A and B glandular trichomes. Nine F1 families [(Phu-Stn) × Ber] were evaluated over two experiments in the greenhouse for A and B trichome density (5 mm2 of abaxial surface) and PPO activity 45 days after planting. A completely randomized design in an experimental hierarchical classification arrangement was used to quantify the genetic variability and to estimate broad-sense heritabilities (defined on an individual basis) for the attributes under study. To characterize the inheritance of these attributes further and to estimate narrow-sense heritabilities, fifteen backcross (BC) families were evaluated in a randomized complete-block design with three replications and analyzed by half-sib family analysis. Phenotypic and genotypic correlations between these attributes were also estimated. In the F1 families, broad-sense heritabilities were 0.59 and 0.41 for density of A and B trichomes, respectively. In the BC population, narrow-sense heritabilities were 0.15 and 0.08 for A trichome density and PPO activity, respectively; expression of B trichomes was almost absent in this generation. Genotype × environment interaction was significant for density of A trichomes and highly significant for density of B trichomes in F1 families. There was some level of positive association between density of A and B trichomes and PPO activity. Additive genetic variance of these attributes was very low in this study; therefore, selection schemes based on family selection and progeny testing would be an appropriate breeding strategy for improving these traits.

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Maria Jose Gonzalo, Marin Talbot Brewer, Claire Anderson, David Sullivan, Simon Gray, and Esther van der Knaap

.W. 1994 Empirical threshold values for quantitative trait mapping Genetics 138 963 971 Cong, B. Liu, J. Tanksley, S.D. 2002 Natural alleles at a tomato fruit size quantitative trait locus differ by