Diversity of Water Yam (Dioscorea alata L.) Accessions from Côte d’Ivoire Based on SNP Markers and Agronomic Traits

Bakayoko, Lassana; Pokou, Désiré N’Da; Kouassi, A.B.; Agre, Paterne A.; Kouakou, Amani Michel; Brice, Dibi Konan Evrard; N’zué, Boni; Mondo, Jean M.; Adebola, Patrick; Akintayo, Oluyemi Titilola; Asfaw, Asrat; N’Guetta, Assanvo Simon Pierre

doi:10.3390/plants10122562

Cited by 8 publications

(8 citation statements)

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“…Results of the AMOVA revealed high genetic variation among the three clusters and lower genetic variation among landraces within clusters. Similarly, Bakayoko et al. (2021) reported low molecular variability within groups and high between groups of D. alata accessions from Côte d’Ivoire using SNP markers.…”

Section: Discussionmentioning

confidence: 91%

“…Results of the AMOVA revealed high genetic variation among the three clusters and lower genetic variation among landraces within clusters. Similarly, Bakayoko et al (2021) reported low molecular variability within groups and high between groups of D. alata accessions from Cote d'Ivoire using SNP markers. High levels of genetic variation among clusters of yam landraces in Nigeria indicated a lack of gene flow, possibly due to low seed-yam (mini or small whole tubers or portion of tubers used for propagation) exchange among farmers in geographically distant areas.…”

Section: Figurementioning

confidence: 93%

“…High levels of genetic variation among clusters of yam landraces in Nigeria indicated a lack of gene flow, possibly due to low seed-yam (mini or small whole tubers or portion of tubers used for propagation) exchange among farmers in geographically distant areas. In contrast, the low variation within cluster revealed a low degree of genetic differentiation, which may be attributed to regional preferences for some dominant varieties (Bakayoko et al, 2021). As stated by Stuart et al (2021), sharing (small amounts) of seed-yam tubers as a gift is a common practice among farmers of the same and or different communities.…”

Section: Figurementioning

confidence: 93%

“…(2009) reported a high genetic diversity of yam across Nigeria compared to collections from Benin, Congo, Côte d’Ivoire, Equatorial Guinea, Gabon, Ghana, Sierra Leone, and Togo. Recent studies reported the presence of moderate to high landrace diversity in Benin Republic ( Agre et al., 2021a ) and Côte d’Ivoire ( Bakayoko et al., 2021 ). The tradition of continued domestication from the wild relatives by African farmers contributes to the high level of varietal and genetic diversity ( Mignouna and Dansi, 2003 ; Dumont et al., 2006 ; Scarcelli et al., 2006 ; Agre et al., 2021a ; Adewumi et al., 2022 ).…”

Section: Introductionmentioning

confidence: 99%

“…The use of molecular markers is, an accurate method of identifying genotypes at the species level and harnessing genetic diversity in yam crop ( Agre et al., 2021a ; Pachakkil et al, 2021 ). Different molecular markers, including restriction fragment length polymorphism (RFLP) ( Terauchi et al., 1992 ), random amplified polymorphic DNA (RAPD) ( Mignouna et al., 2003 ; Mignouna et al, 2005 ), simple sequence repeat (SSR) ( Mignouna et al., 2003 ; Loko et al., 2017 ; Pachakkil et al, 2021 ), inter-simple sequence repeat (ISSR) ( Zhou et al., 2008 ), amplified fragment length polymorphism (AFLP) ( Mignouna et al., 2003 ), based on the use of next-generation sequencing ( Sartie et al., 2012 ; Girma et al., 2014 ; Saski et al., 2015 ; Akakpo et al., 2017 ; Agre et al., 2019 ; Bhattacharjee et al., 2020 ; Darkwa et al., 2020b ; Agre et al., 2021a ; Bakayoko et al., 2021 ) and DNA barcoding sequencing ( Girma et al., 2015 ; Ude et al., 2019 ), have been used successfully in characterizing yam diversity. The above-mentioned studies assessed the genetic diversity and possible genetic evolution of yam species; few linked the pattern of genetic diversity with its genetic merit that facilitates the identification of desirable genes/alleles addressing the current and future challenges in yam cultivation in the region.…”

Section: Introductionmentioning

confidence: 99%

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Variability and genetic merits of white Guinea yam landraces in Nigeria

Agre

Edemodu²,

Obidiegwu³

et al. 2023

Front. Plant Sci.

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IntroductionLandraces represent a significant gene pool of African cultivated white Guinea yam diversity. They could, therefore, serve as a potential donor of important traits such as resilience to stresses as well as food quality attributes that may be useful in modern yam breeding. This study assessed the pattern of genetic variability, quantitative trait loci (QTLs), alleles, and genetic merits of landraces, which could be exploited in breeding for more sustainable yam production in Africa.MethodsA total of 86 white Guinea yam landraces representing the popular landraces in Nigeria alongside 16 elite clones were used for this study. The yam landraces were genotyped using 4,819 DArTseq SNP markers and profiled using key productivity and food quality traits.Results and discussionGenetic population structure through admixture and hierarchical clustering methods revealed the presence of three major genetic groups. Genome-wide association scan identified thirteen SNP markers associated with five key traits, suggesting that landraces constitute a source of valuable genes for productivity and food quality traits. Further dissection of their genetic merits in yam breeding using the Genomic Prediction of Cross Performance (GPCP) allowed identifying several landraces with high crossing merit for multiple traits. Thirteen landraces were identified as potential genitors to develop segregating progenies to improve multiple traits simultaneously for desired gains in yam breeding. Results of this study provide valuable insights into the patterns and the merits of local genetic diversity which can be utilized for identifying desirable genes and alleles of interest in yam breeding for Africa.

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Section: Discussionmentioning

confidence: 91%

Section: Figurementioning

confidence: 93%

Section: Figurementioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Variability and genetic merits of white Guinea yam landraces in Nigeria

Agre

Edemodu²,

Obidiegwu³

et al. 2023

Front. Plant Sci.

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Advancing breeding for climate‐resilient yam production in Côte d'Ivoire

Kouakou,

Chair,

Dibi

et al. 2023

Plants People Planet

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Societal Impact StatementYam plays an important role in ensuring food security in Côte d'Ivoire, serving as a staple crop for 60% of the population and a significant source of income. It holds deep cultural significance for the Akan and Gour ethnic groups. Preserving yam production is essential for both food security and the preservation of cultural heritage. However, productivity is decreasing while demand is expected to double in the next 30 years. Soil degradation and climate change are major threats to yam production. This article contextualizes the main factors threatening yam production (i.e., soil degradation and climate change) and discusses the consequences and ways to mitigate them.SummaryThe anticipated twofold increase in Côte d'Ivoire's population within the next three decades poses a significant challenge for agricultural research to sustain food security. Despite being an under‐researched and often neglected crop, yam remains the primary staple food and a crucial source of income in the country. With an annual estimated market value of over 2000 billion CFA francs, yam ranks among the top five most economically valuable crops in Côte d'Ivoire. For the past 15 years, yam production has experienced a decline in productivity, which has been compensated for by expanding the cropped area. Unfortunately, this approach exacerbates the risk of deforestation and soil degradation. Additionally, the impact of climate change on yam production, coupled with a lack of financial resources to address it, has rendered this unsustainable mode of production even more precarious. The purpose of this study is to provide an overview of the effects of climate change on yam production in Côte d'Ivoire. We investigated the reasons for the productivity decline and described the risks on food security. Furthermore, we explained how varietal innovation of Dioscorea alata could play a critical role in mitigating these effects and outlined related research avenues that need to be explored. To help policymakers and research programme directors justify the importance of this agenda, this article presents the main arguments in favour of a substantial investment in adapting yam production to the global changes affecting Côte d'Ivoire.

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