Rodriguez, Iveth Y.

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    Análisis fenotípico y genético de frijol tépari (Phaseolus acutifolius A. Gray) para tolerancia a factores bióticos y abióticos
    (2018) Rodriguez, Iveth Y.; Beaver, James S.; College of Agricultural Sciences; Linares Ramírez, Angela; Porch, Timothy; Department of Crops and Agro-Environmental Sciences; Ortiz Rios, Gloribell
    High temperatures, drought and diseases are critical factors that limit the production of grain legumes, especially in tropical countries. Tepary beans (Phaseolus acutifolius A. Gray) is a species that is highly tolerant to drought, high temperatures and resistant to common bacterial blight caused by Xanthomonas axonopodis pv. phaseoli. The objectives of the study were to identify morphological characteristics and Quantitative Trait Loci (QTL) associated with stress tolerance due to terminal drought and high temperatures, and resistant to common bacterial blight in a population. Recombinant inbred lines (RIL) from the cross between the tepary bean accessions G40001 x G40022 were evaluated under stress conditions for terminal drought and high temperatures at the UPR, Juana Díaz, Experimental Station, Puerto Rico during 2015 and 2016. Evaluations of reactions to common bacterial blight were performed during 2016 in a greenhouse at the USDA-ARS Tropical Agriculture Research Station in Mayagüez, Puerto Rico. The evaluated characteristics were: seed yield components, phenological characteristics, vegetation indices, pollen shed, carbon isotope discrimination and in the greenhouse study the phenotypic reaction to the Xap strains 3353 and 484A. Significant differences were observed between the evaluated characteristics and there were positive correlations between seed yield, weight of one hundred seeds and seed dimensions (p≤0.05). The genetic linkage map of the RIL population was constructed using 1343 SNPs with a length of 1448 cM. QTLs associated with seed yield components, phenological characteristics, harvest indices, seed size and color were identified mainly on chromosomes 3, 7 and 8; a number of these QTLs have been previously reported in common bean. A QTL was identified for the first time for carbon isotope discrimination on chromosome 7 in a Phaseolus species and most QTL were the first reported in tepary bean. This study demonstrates the genetic similarity between tepary bean and common bean and it becomes a useful resource to understand the genetics of tepary beans and to develop breeding strategies for the improvement of the crop including the color and size of the seed.