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High incidence of Uromyces phaseoli and Pseudomonas syringae pv. phaseolicola was reported in Pinto and Great Northern bean fields in SW Nebraska and NE Colorado (USA) in 1981. Pinto beans showed other symptoms that, after isolation and tests, were found to be caused by P. syringae pv. syringae. ...


Steadman, James R.Schwartz, Howard F.[Rust and halo blight epidemics, and the first report of bacterial brown spot in western Nebraska and eastern Colorado]Rust and halo blight epidemics, and the first report of bacterial brown spot in western Nebraska and eastern Colorado

Bronzing was observed in many of the bean trials conducted at Fort Collins (Colorado, USA) during 1982 to study the influence of water and shading stress on photosynthesis and protein content of 3 dry bean var., Roza, Pinto U.I. 111, and Olathe. Bronzing symptoms appeared during the late flowerin...


Schwartz, Howard F.Ballarin, M.Riggle, R.L.[Shade, irrigation and variety effects upon bronzing responses of dry beans in Colorado]Shade, irrigation and variety effects upon bronzing responses of dry beans in Colorado

The North American crop wild relatives (CWR) of lettuce (Lactuca L.) represent an underexplored pool of genetic diversity of potential value to breeding programs. The 10 species belong to three different groups: a native clade including at least six allotetraploid species [L. biennis (Moench) Fer...


Lebeda, AlešKřístková, EvaKitner, MiloslavMajeský, ĽubošDoležalová, IvanaKhoury, Colin K.Widrlechner, Mark P.Hu, JinguoCarver, DanielAchicanoy, Harold A.E.Sosa, Chrystian C.[Research Gaps and Challenges in the Conservation and Use of North American Wild Lettuce Germplasm]Research Gaps and Challenges in the Conservation and Use of North American Wild Lettuce Germplasm

Several species of double-stranded RNA (dsRNA) were found to occur in the cassava clone Secundina, which was thought to be virus- free. A large dsRNA molecule (6.6 x 106 Mr = relative molecular mass)(L-dsRNA) was shown to be graft, but not mechanically transmitted and occurred primarily in a nucl...


Gabriel, C.J.Walsh, RNolt, Barry L.[Postharvest root deterioration or vascular streaking of cassava clones (accessions and breeding lines) was evaluated with harvests at different ages (8 and 12 mo.), seasons (beginning and end of wet season), and locations (CIAT-Palmira, Carimagua, and Caribia in Colombia) to assess the effect of environmental factors on cassava genotypes. Vascular streaking was sensitive to any of these environmental factors. Genotype x location interaction was highly significant suggesting that final cv. selection should be carried out in each location. Genetic analysis carried out in one location suggested that inheritance of vascular streaking was, at least partly, controlled by additive factors and was quantitative rather than qualitative. Narrow sense heritability of 0.64 was obtained. Vascular streaking was highly and significantly correlated with root DM content in all the trials conducted during 7 yr. Since free recombination between resistance to vascular streaking and high root DM content may not be possible, the most acceptable balance between these 2 traits should be defined according to the use of product and edaphoclimatic condition of production area prior to selection program. (AS)]Postharvest root deterioration or vascular streaking of cassava clones (accessions and breeding lines) was evaluated with harvests at different ages (8 and 12 mo.), seasons (beginning and end of wet season), and locations (CIAT-Palmira, Carimagua, and Caribia in Colombia) to assess the effect of environmental factors on cassava genotypes. Vascular streaking was sensitive to any of these environmental factors. Genotype x location interaction was highly significant suggesting that final cv. selection should be carried out in each location. Genetic analysis carried out in one location suggested that inheritance of vascular streaking was, at least partly, controlled by additive factors and was quantitative rather than qualitative. Narrow sense heritability of 0.64 was obtained. Vascular streaking was highly and significantly correlated with root DM content in all the trials conducted during 7 yr. Since free recombination between resistance to vascular streaking and high root DM content may not be possible, the most acceptable balance between these 2 traits should be defined according to the use of product and edaphoclimatic condition of production area prior to selection program. (AS)

The development and release of Negro Huasteco 81, a black- seeded bush bean var., are described. This line was consistently the most tolerant from a total of 25 BGMV-tolerant lines and var. introduced from a collaborative project between CIAT and the Instituto de Ciencia y Tecnologia Agricolas, G...


Yoshii, K.Rodríguez Rodríguez, José Raúl[The release of Negro Huasteco 81, a new Mexican bean variety tolerant to golden mosaic virus]The release of Negro Huasteco 81, a new Mexican bean variety tolerant to golden mosaic virus
Blair, Matthew W.Muñoz Flórez, Ligia CarmenzaDebouck, Daniel G.[Tepary beans (Phaseolus acutifolius): A forgotten genetc resource for dryland agriculture = Haricot tépary (Phaseolus acutifolius): Une ressource génétique oubliée de l`agriculture des zones arides]Tepary beans (Phaseolus acutifolius): A forgotten genetc resource for dryland agriculture = Haricot tépary (Phaseolus acutifolius): Une ressource génétique oubliée de l`agriculture des zones arides
McMillan, M.S.Vaughn, M.R.Schwartz, Howard F.[Occurrence of the perfect stage of bean rust in Colorado]Occurrence of the perfect stage of bean rust in Colorado

Genetic diversity of common beans is presented for subdivisions of Mesoamerican groups. Three subgroups were identified by means of molecular markers, such as proteins (phaseolin) and allozymes.


Singh, S.Gutiérrez, A.Urrea, C.Koenig, R.Nodari, R.Gepts, Paul L.[Marker-based analysis of genetic diversity in common bean]Marker-based analysis of genetic diversity in common bean
Acosta Gallegos, Jorge AlbertoWhite, J.W.[Effect of photoperiod response on adaptation to the Altiplano of Mexico]Effect of photoperiod response on adaptation to the Altiplano of Mexico

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