Broadening the Genetic Base of Common Bean Cultivars

Singh, Shree P.

doi:10.2135/cropsci2001.1659

Cited by 304 publications

(305 citation statements)

References 268 publications

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“…Evolutionary studies of crop species are crucial for several applications; indeed, the knowledge relating to the level and structure of genetic diversity of crop plants and their wild relatives is the starting point of any breeding program (44)(45)(46)(47)(48)(49)(50)(51)(52). Our study indicates that, to explore new genetic diversity that is not incorporated into the current domesticated germplasm and consider this high genetic diversity in the Mesoamerican accessions that is not present in the Andean gene pool, it is the wild Mesoamerican germplasm that should be used in breeding programs, because it has potential for the release of new cultivars.…”

Section: Discussionmentioning

confidence: 99%

Mesoamerican origin of the common bean ( Phaseolus vulgaris L.) is revealed by sequence data

Bitocchi

Nanni

Bellucci

et al. 2012

Proc. Natl. Acad. Sci. U.S.A.

327

299

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Knowledge about the origins and evolution of crop species represents an important prerequisite for efficient conservation and use of existing plant materials. This study was designed to solve the ongoing debate on the origins of the common bean by investigating the nucleotide diversity at five gene loci of a large sample that represents the entire geographical distribution of the wild forms of this species. Our data clearly indicate a Mesoamerican origin of the common bean. They also strongly support the occurrence of a bottleneck during the formation of the Andean gene pool that predates the domestication, which was suggested by recent studies based on multilocus molecular markers. Furthermore, a remarkable result was the genetic structure that was seen for the Mesoamerican accessions, with the identification of four different genetic groups that have different relationships with the sets of wild accessions from the Andes and northern Peru–Ecuador. This finding implies that both of the gene pools from South America originated through different migration events from the Mesoamerican populations that were characteristic of central Mexico

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Section: Discussionmentioning

confidence: 99%

Mesoamerican origin of the common bean ( Phaseolus vulgaris L.) is revealed by sequence data

Bitocchi

Nanni

Bellucci

et al. 2012

Proc. Natl. Acad. Sci. U.S.A.

327

299

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“…), P. coccineus L., P. costaricensis Freytag & Debouck and P. albescens McVaugh ex R. Ramirez. & A. Delgado (Singh, 2001). Other Phaseolus species, such as P. acutifolius, constitute a tertiary gene pool because they are more distantly related, with sexual hybridization barriers (Delgado-Salinas et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

Origin of year-long bean (Phaseolus dumosusMacfady, Fabaceae) from reticulated hybridization events between multiplePhaseolusspecies

Mina-Vargas

McKeown

Flanagan

et al. 2016

Ann Bot

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Background and Aims Improved understanding of the secondary gene pools of crops is essential for advancing genetic gain in breeding programmes. Common bean, Phaseolus vulgaris, is a staple crop with several wild relatives in its secondary gene pool. The year-long bean, P. dumosus, an important crop in Guatemala, is considered particularly closely related to P. vulgaris and a potential source of novel variation. However, the genetic diversity and relationship to other Phaseolus species of P. dumosus remain unclear.Methods We conducted the first comprehensive investigation of P. dumosus genetic diversity using both nuclear and chloroplast genome markers. Our nuclear marker set included over 700 markers present within the Phaseolus DArT (Diversity Arrays Technology) array, which we applied to P. dumosus and other relatives of P. vulgaris (including every secondary gene pool species: P. acutifolius, P. albescens, P. coccineus and P. costaricensis).Key Results Phaseolus dumosus arose from hybridization of P. vulgaris and P. coccineus, followed by at least two later hybridizations with sympatric congener populations. Existing P. dumosus collections have low genetic diversity.Conclusions The under-utilized crop P. dumosus has a complex hybrid origin. Further sampling in the region in which it arose may uncover additional germplasm for introgressing favourable traits into crops within the P. vulgaris gene pool.

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“…Such classification supports breeding efforts to improve plant adaptation to diverse environments and cropping systems under which beans are grown (Singh, 2001). Therefore, the genotypes were grouped according to their growth habit aiming to identify some relationship between root traits and shoot architecture.…”

Section: Genotypic Variabilitymentioning

confidence: 99%

Variability of root traits in common bean genotypes at different levels of phosphorus supply and ontogenetic stages

Trindade

Araújo

2014

Rev. Bras. Ciênc. Solo

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SUMMARYSelection of common bean (Phaseolus vulgaris L.) cultivars with enhanced root growth would be a strategy for increasing P uptake and grain yield in tropical soils, but the strong plasticity of root traits may compromise their inclusion in breeding programs. The aim of this study was to evaluate the magnitude of the genotypic variability of root traits in common bean plants at two ontogenetic stages and two soil P levels. Twenty-four common bean genotypes, comprising the four growth habits that exist in the species and two wild genotypes, were grown in 4 kg pots at two levels of applied P (20 and 80 mg kg -1 ) and harvested at the stages of pod setting and early pod filling. Root area and root length were measured by digital image analysis. Significant genotype × P level and genotype × harvest interactions in analysis of variance indicate that the genotypic variation of root traits depended on soil nutrient availability and the stage at which evaluation was made. Genotypes differed for taproot mass, basal and lateral root mass, root area and root length at both P levels and growth stages; differences in specific root area and length were small. Genotypes with growth habits II (upright indeterminate) and III (prostrate indeterminate) showed better adaptation to limited P supply than genotypes of groups I (determinate) and IV (indeterminate climbing). Between the two harvests, genotypes of groups II and III increased the mass of basal and lateral roots by 40 and 50 %, respectively, whereas genotypes of groups I and IV by only 7 and 19 %. Values of the genotypic coefficient of determination, which estimates the proportion of phenotypic variance resulting from genetic effects, were higher at early pod filling than at pod setting. Correlations between shoot mass and root mass, which could indicate indirect selection of root systems via aboveground biomass, were higher at early pod filling than at pod setting. The results indicate that selection for root traits in common bean genotypes should preferentially be performed at the early pod-filling stage.Index terms: growth habit, Phaseolus vulgaris, phosphorus efficiency, root system.

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Broadening the Genetic Base of Common Bean Cultivars

Cited by 304 publications

References 268 publications

Mesoamerican origin of the common bean ( Phaseolus vulgaris L.) is revealed by sequence data

Mesoamerican origin of the common bean ( Phaseolus vulgaris L.) is revealed by sequence data

Origin of year-long bean (Phaseolus dumosusMacfady, Fabaceae) from reticulated hybridization events between multiplePhaseolusspecies

Variability of root traits in common bean genotypes at different levels of phosphorus supply and ontogenetic stages

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