Genetic diversity in Tepary bean (Phaseolus acutifolius) landraces grown in Botswana

Molosiwa, Odireleng O.; Kgokong, Sylvia; Makwala, B; Gwafila, C.; Ramokapane, M G

doi:10.5897/jpbcs2014.0458

Cited by 19 publications

(17 citation statements)

References 15 publications

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“…In sub‐Saharan Africa, the crop is mostly cultivated by smallholder farmers under poor soil conditions and low farm input systems (Jiri & Mafongoya, 2016). Further, farmers in the region continuously grow unimproved varieties which are low yielding, poorly adapted and susceptible to abiotic stress factors, mainly drought stress (Mhlaba, Mashilo, Shimelis, et al, 2018; Molosiwa, Kgokong, Makwala, Gwafila, & Ramokapane, 2014). In the region, drought is the most important constraint affecting sustainable tepary bean production (Beebe, Rao, Devi, & Polania, 2014; Souter et al, 2017) and causing severe yield losses of major food crops which leads to food insecurity.…”

Section: Introductionmentioning

confidence: 99%

Breeding tepary bean (Phaseolus acutifolius) for drought adaptation: A review

et al. 2020

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Tepary bean (Phaseolus acutifolius A. Gray) is a relatively higher drought‐tolerant crop than common bean (P. vulgaris), serving as genetic resource for food and genetic enhancement of related legumes. Tepary bean production is hampered by cultivation of low yielding and abiotic stress‐susceptible cultivars. Targeted selection of agronomic, physiological and biochemical traits that maximizes yield gains using Phaseolus gene pool is useful to develop stress‐tolerant and high‐performing genotypes. The objective of this review is to provide breeding progress made regarding tepary bean improvement for drought adaptation. Agronomic, physiological and biochemical traits utilized for selection of drought‐tolerant genotypes are highlighted. Genetic and genomic resources developed for tepary bean or closely related species such as common bean useful for genetic analysis and breeding are discussed. Opportunities and challenges to facilitate breeding of tepary bean genotypes with improved abiotic stress adaptation are highlighted. This will enable development of drought‐tolerant tepary bean genotypes targeting selection of agronomic, physiological and biochemical traits. Use of genetically related and complementary Phaseolus species and marker‐assisted selection method is key to developing drought‐tolerant genotypes.

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Section: Introductionmentioning

confidence: 99%

Breeding tepary bean (Phaseolus acutifolius) for drought adaptation: A review

et al. 2020

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“…Ca, Mg, Cu, Fe, K, Mn, S, Zn), oil and 33% saturated fatty acids, 67% unsaturated fatty acids, 24% monounsaturated fatty acids and 42% polyunsaturated fatty acids (Amarteifio and Moholo, 1998;Bhardwaj and Hamama, 2004;. In some instances, the crop is grown as leafy vegetable and the haulms are used for animal feed (Molosiwa et al, 2014). Tepary bean has high level of resistance to bean weevil caused by Acanthoscelides obtectus (Kusolwa and Myers, 2011), common bacterial blight [Xanthomonas campestris (axonopodis) pv.…”

Section: Introductionmentioning

confidence: 99%

Genetic interrelationship among tepary bean (Phaseolus acutifolius A. Gray) genotypes revealed through SSR markers

Mhlaba¹,

Amelework²,

Shimelis³

et al. 2018

Aust J Crop Sci

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Tepary bean (Phaseolus acutifolius A. Gray) is one of the useful plant genetic resources possessing novel genes for abiotic and biotic stress tolerance. It is largely used in the breeding of common bean or related tropical legumes. The objective of this study was to determine the genetic interrelationship present among 20 diverse tepary bean genotypes using 10 selected and polymorphic simple sequence repeat (SSR) markers and to identify genetically unique parental lines for developing breeding populations. The SSR markers amplified a total of 57 putative alleles with a size range of 102 to 304 base pairs. Number of alleles ranged from 2 to 16 with a mean of 5.7 per locus. Number of effective alleles ranged from 1.5 to 11.6 with a mean of 4.32. The mean observed and expected heterozygosity were 0.45 and 0.51, respectively, reflecting moderate level of genetic interrelationship among the tested genotypes. The mean polymorphic information content (PIC) of the SSR loci was 0.50 suggesting that the selected markers had high discriminatory power for genetic diversity analysis of tepary bean. Genetic distances varied from 0.18 to 0.64 with a mean value of 0.42, signifying relatively low levels of genetic diversity among the studied genotypes. Cluster analysis grouped the genotypes into three distinct genetic groups. Unique genotypes such as G40201, G40237, G40158, G40157 and G40158 from Cluster I, G40084 and G40033 from Cluster III were selected. These are distantly related parents and recommended for further breeding or genetic recombination to broaden the genetic basis of tepary bean or related legumes.

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“…On the African continent, tepary bean has been recognized as an important food crop to combat malnutrition and enhance income and livelihoods of resource-limited farmers in many countries, including Kenya and Zimbabwe (Jiri and Mafongoya, 2016). Small farmers in Botswana grow tepary bean for food and utilize the haulms (stems) as feed for animals (Molosiwa et al, 2014).…”

Section: Tepary Beanmentioning

confidence: 99%

Forage Potential of Summer Annual Grain Legumes in the Southern Great Plains

Baath¹,

Northup

Rocateli³

et al. 2018

Agronomy Journal

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Winter wheat (Triticum aestivum L.) and perennial warm-season grasses are the primary forage resources for grazing yearling stocker cattle (Bos taurus) in the US Southern Great Plains (SGP). However, low nutritive value of perennial grasses during mid to late summer limits high rates of growth by stocker cattle. In response, there has been a continued search for plant materials with the potential to provide forage high in crude protein (CP) and digestibility during August through September. A broad range of under-utilized legume species that are grown as grain crops in Africa, India, and South and Central America may have some capacity to serve as high quality pasture or harvested forage in the SGP. However, any crop selection must account for limitations related to unpredictable summer rainfall amounts and patterns, and the frequent occurrence of prolonged drought. Further, any selection should not create water deficits for following winter wheat, the primary forage and grain crop in the region. This article summarizes a small subset of the broad range of underutilized grain legumes (pulses) which exist worldwide and soybean [Glycine max (L.) Merr.] that may have capacity to serve as high quality forage for late-summer grazing. Bringing these crops into forage-stocker production systems could improve the overall system effectiveness, in addition to providing other ecosystem services (e.g., ground cover, grain crops).

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Genetic diversity in Tepary bean (Phaseolus acutifolius) landraces grown in Botswana

Cited by 19 publications

References 15 publications

Breeding tepary bean (Phaseolus acutifolius) for drought adaptation: A review

Breeding tepary bean (Phaseolus acutifolius) for drought adaptation: A review

Genetic interrelationship among tepary bean (Phaseolus acutifolius A. Gray) genotypes revealed through SSR markers

Forage Potential of Summer Annual Grain Legumes in the Southern Great Plains

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