Identification of QTLs for capsaicinoids, fruit quality, and plant architecture-related traits in an interspecific Capsicum RIL population.

Shawn C Yarnes, Hamid Ashrafi, Sebastian Reyes-Chin-Wo, Theresa A Hill, Kevin M Stoffel, Allen Van Deynze

Seed Biotechnology Center, University of California, Davis, CA 95616, USA.

Genome / National Research Council Canada = Génome / Conseil national de recherches Canada 2013 Jan

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Quantitative trait loci (QTL) analyses in pepper are common for horticultural, disease resistance, and fruit quality traits; although none of the studies to date have used sequence-based markers associated with genes. In this study we measured plant architectural, phenological, and fruit quality traits in a pepper mapping population consisting of 92 recombinant inbred lines derived from a cross between Capsicum frutescens acc. 2814-6 and C. annuum var. NuMexRNAKY. Phenotypic measurements were correlated to loci in a high-density EST-based genetic map. In total, 96 QTL were identified for 38 traits, including 12 QTL associated with capsaicinoid levels. Twenty-one loci showed correlation among seemingly unrelated phenotypic categories, highlighting tight linkage or shared genetics between previously unassociated traits in pepper.

Citation

Shawn C Yarnes, Hamid Ashrafi, Sebastian Reyes-Chin-Wo, Theresa A Hill, Kevin M Stoffel, Allen Van Deynze. Identification of QTLs for capsaicinoids, fruit quality, and plant architecture-related traits in an interspecific Capsicum RIL population. Genome / National Research Council Canada = Génome / Conseil national de recherches Canada. 2013 Jan;56(1):61-74