Morphological and molecular characterization of cultivated yam (Dioscorea species) in selected counties in Kenya

Atieno, Valentine; Gatheri, Grace W.; Kamau, Joseph; Muthini, Morris

doi:10.5897/ajps2020.2020

Cited by 2 publications

(3 citation statements)

References 16 publications

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“…In the current study, the morphological traits that had a principal role in discriminating between the yam genotypes were tuber and aerial characteristics. Tese outcomes from the current study were in congruence with reports obtained by Valentine et al [15]. In their study, they revealed that the most astute traits were stem colour, leaf margin colour, leaf position, petiole colour, tuber shape, tuber surface texture, and tuber fesh colour.…”

Section: Discussionsupporting

confidence: 92%

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Phenotypic Diversity within Ugandan Yam (Dioscorea species) Germplasm Collection

Adjei

Esuma

Alicai

et al. 2022

International Journal of Agronomy

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A proper understanding of the diversity of the available germplasm is an initial step for the genetic improvement of a crop through breeding. However, there is limited information on the diversity of Uganda’s yam germplasm. The study sought to characterize the diversity of yam germplasm utilized for decades in Uganda together with germplasm recently introduced from West Africa using phenotypic traits. A germplasm collection of 291 genotypes was characterized using 28 phenotypic traits. Data were subjected to multivariate analysis using principal component analysis and cluster analysis. The traits assessed were informative and discriminating, with 62% of the total variation explained among the first six principal components. Results showed that the important phenotypic traits contributing to most of the variability among the genotypes were leaves, flowering, and tuber traits. Ugandan genotypes were identified with amorphous tuber shapes compared to West African genotypes. The study has shown that there is ample phenotypic variability within the major yam genotypes in Uganda yam germplasm that can be used for genetic improvement. More in-depth molecular and biochemical studies to further understand the diversity are recommended. The preprint was made available by research square in the following link: “https://www.researchsquare.com/article/rs-1518551/v1.”

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Section: Discussionsupporting

confidence: 92%

“…From that study, no clear morphological variations were observed between the genotypes. Such eforts have also been made in Kenya where 22 morphological traits were used to evaluate diversity and reported close relatedness among the yam genotypes [15].…”

Section: Introductionmentioning

confidence: 99%

Phenotypic Diversity within Ugandan Yam (Dioscorea species) Germplasm Collection

Adjei

Esuma

Alicai

et al. 2022

International Journal of Agronomy

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“…Unfortunately, the germplasm of D. bulbifera in Uganda has not been characterized, yet germplasm characterization is an initial step to conservation (Bioversity International, 2003). Elsewhere, several studies have been done to characterize morphological traits of Dioscorea species including D. alata L (Anokye et al, 2014), Amerindian yam (Beyerlein et al, 2018), and D. bulbifera (Atieno et al, 2020). Morphological traits are however less informative and exhibit a lot of variations attributed to agro-climatic fluctuations.…”

Section: Introductionmentioning

confidence: 99%

Diversity of Dioscorea bulbifera Linn in Uganda assessed by morphological markers and genotyping-by-sequencing technology (GBS)

Hilda,

Hedmon,

Naasson

et al. 2023

J. Plant Breed. Crop Sci.

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Dioscorea bulbifera L. is a widely distributed plant in the humid and sub-humid tropics. The taxonomic treatment of this species is ambiguous due to its extreme polymorphic morphological characters. Therefore, it is imperative to assess the species distribution, and the inter and intraspecific variability relationships in D. bulbifera. In this study, the genetic diversity and species distribution of 41 accessions of D. bulbifera in Uganda were investigated. Diversity among the 41 accessions was assessed using distribution of accessions, morphological descriptors and SNP markers. To investigate the relationship between individuals and populations, a heat map, phylogenetic tree, and principal components analysis were used. A total of 221455432 paired-end raw reads were generated out of which 162662 SNP loci were called with 150 bp reads (2×150) to a targeted depth of 112 million reads. Analysis of SNP data has proved a heterogenous population of D. bulbifera with an exception of Abur accessions that stand out as homogenous populations. This study has revealed that the utilization of advanced sequencing techniques such as GBS in combination with statistical analysis is a robust method for evaluating genetic diversity in a complex crop such as aerial yam.

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Morphological and molecular characterization of cultivated yam (Dioscorea species) in selected counties in Kenya

Cited by 2 publications

References 16 publications

Phenotypic Diversity within Ugandan Yam (Dioscorea species) Germplasm Collection

Phenotypic Diversity within Ugandan Yam (Dioscorea species) Germplasm Collection

Diversity of Dioscorea bulbifera Linn in Uganda assessed by morphological markers and genotyping-by-sequencing technology (GBS)

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