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Little information is available regarding the relationship of Caribbean bean landraces with the Andean and Mesoamerican gene pools of common bean (Phaseolus vulgaris L.) While small-seeded Mesoamerican black beans are prevalent in parts of the Caribbean, many of the regionally preferred red mottl...


Durán, L.A.Blair, Matthew W.Giraldo Zapata, Martha C.Macchiavelli, Raúl E.Prophete, ENin, JCBeaver, James S.[Morphological and molecular characterization of common bean landraces and cultivars from the Caribbean]Morphological and molecular characterization of common bean landraces and cultivars from the Caribbean

If we are to breed common bean (Phaseolus vulgaris L.) for durable resistance to diseases, we must understand pathogenic variation and find sources of resistance. Our first objective was to determine the patterns of pathogenic variation found among isolates of Phaeoisariopsis griseola (PG), the f...


Pastor Corrales, Marcial A.Jara, Carlos E.Singh, Shree P.[Pathogenic variation in, sources of, and breeding for resistance to Phaeoisariopsis griseola causing angular leaf spot in common bean]Pathogenic variation in, sources of, and breeding for resistance to Phaeoisariopsis griseola causing angular leaf spot in common bean

Field inoculation trials with cassava (Manihot esculenta Crantz) were conducted in Quilichao (typic Dystropept soil) and Carimagua (Haplustox soil). In Quilichao, with a large and effective native VA-mycorrhizal (VAM) population, inoculation withGlomus manihotis did not increase cassava yields si...


Howeler, Reinhardt H.Sieverding, E[Potentials and limitations of mycorrhizal inoculation illustrated by experiments with field-grown cassava]Potentials and limitations of mycorrhizal inoculation illustrated by experiments with field-grown cassava

Forty-five international races of Pyricularia grisea, representing all nine race groups, were identified in a "hot spot" breeding site (Santa Rosa) in Colombia, with the largest number included in the IA group. The international race system did not fully describe the virulence spectrum of the iso...


Correa Victoria, Fernando J.Zeigler, Robert S.[Pathogenic variability in Pyricularia grisea at a rice blast "hot spot" breeding site in Eastern Colombia]Pathogenic variability in Pyricularia grisea at a rice blast "hot spot" breeding site in Eastern Colombia

The paper summarizes research conducted at International Center for Tropical Agriculture (CIAT) on responses of cassava to extended water shortages in the field aided by modern gas-exchange and water-relation techniques as well as biochemical assays. The aim of the research was to coordinate basi...


El-Sharkawy, Mabrouk A.[Physiological characteristics of cassava tolerance to prolonged drought in the tropics : Implications for breeding cultivars adapted to seasonally dry and semiarid environments]Physiological characteristics of cassava tolerance to prolonged drought in the tropics : Implications for breeding cultivars adapted to seasonally dry and semiarid environments

Cassava (Manihot esculenta) is an important staple crop, especially in the arid tropics. Because roots of commercial cassava cultivars contain a limited amount of provitamin A carotenoids, both conventional breeding and genetic modification are being applied to increase their production and accum...


Welsch, RArango, JacoboBar, CSalazar, BAl-Babili, S.Beltrán Giraldo, Jorge AlonsoChavarriaga Aguirre, PaulCeballos, H.Tohme, Joseph M.Beyer, Peter[Provitamin A accumulation in Cassava (Manihot esculenta) roots driven by a single nucleotide polymorphism in a phytoene synthase gene[W]]Provitamin A accumulation in Cassava (Manihot esculenta) roots driven by a single nucleotide polymorphism in a phytoene synthase gene[W]

Deployment of resistant varieties is one major approach to controlling cassava bacterial blight (CBB), caused by Xanthomonas axonopodis pv. manihotis (Xam). To understand the genetic determinism of resistance to CBB, the use of reliable parameters measuring resistance is necessary. In order to te...


Jorge, VVerdier, Valérie[Qualitative and quantitative evaluation of cassava bacterial blight resistance in F1 progeny of a cross between elite cassava clones]Qualitative and quantitative evaluation of cassava bacterial blight resistance in F1 progeny of a cross between elite cassava clones

Fifty-three bean (Phaseolus vulgaris) accessions were evaluated for their reactions to infection by Macrophomina phaseolina under field and greenhouse conditions. A field nursery was established on an experimental farm near Santander de Quilichao, Colombia. All accessions were evaluated in paired...


Pastor Corrales, Marcial A.Abawi, G.S.[Reactions of selected bean accessions to infection by Macrophomina phaseolina]Reactions of selected bean accessions to infection by Macrophomina phaseolina

Rapid-cycling recurrent selection has been implemented to produce cassava varieties that deliver provitamin A carotenoids to human populations that are affected by vitamin A deficiency. Rapid-cycling selection relies on quantification in just one plant per genotype. This study was conducted to a...


Ortiz, D.Sánchez, T.Morante, NCeballos, H.Pachón, HelenaDuque E., Myriam CristinaChavez, Alba L.Escobar Salamanca, Andrés F.[Sampling strategies for proper quantification of carotenoid content in cassava breeding]Sampling strategies for proper quantification of carotenoid content in cassava breeding

A Brazilian isolate of Fusarium oxysporum f. sp. phaseoli (F. o. f. sp. phaseoli) was used to determine the reactions of 66 lines of beans to the Fusarium yellows pathogen in greenhouse tests. The distal 1 cm of root tips of 1-wk-old seedlings grown in sterilized sand were removed, roots were dip...


Pastor Corrales, Marcial A.Abawi, G.S.[Reactions of selected bean germ plasm to infection by Fusarium oxysporum f. sp. phaseoli]Reactions of selected bean germ plasm to infection by Fusarium oxysporum f. sp. phaseoli

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