Genetic Diversity and Population Structure of Irvingia Species Using Dartseq Generated Markers
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Date
2023
Authors
Jepkemboi, Sylvia
Ojol, Patroba
Journal Title
Journal ISSN
Volume Title
Publisher
Taylor and Francis
Abstract
Irvingia gabonensis and Irvingia wombolu trees indigenous to West and
Central Africa are economically important owing to their valuable
kernels. Massive fruit harvesting and reduction of forests land area
has threatened their genetic diversity thus warranting conservation.
This study reports the genetic diversity and population structure based
on dominant markers of Irvingia accessions from Nigeria, Cameroon
and Gabon held at World Agroforestry field genebanks. A total of 60
samples and 6532 SilicoDArT markers revealed high genetic differentiation among populations (phiPT = 0.301, P = .001). The overall
genetic diversity revealed by Nei’s gene diversity (He = 0.117) and
percentage of polymorphic loci (39.60%) was low. I.gabonensis provenances from Cameroon and Nigeria were more diverse than Gabonese
populations. Pairwise phiPT values calculated from AMOVA variances
delineated I. wombolu and I. gabonensis. Population structure and
cluster analysis based on Bayesian algorithm, DAPC and UPGMA methods placed Cameroon at the center of distribution of I. gabonensis
accessions from Nigeria and Gabon. Gabonese accessions tend to
cluster independent of Nigerian accessions while I. wombolu formed
a distinct cluster from I. gabonensis. SilicoDArT markers were found
suitable for population structure and differentiation analysis of Irvingia
accessions and can guide future recollections to enrich genebank
diversity and materials for domestication events.
Description
Article
Keywords
Genetic diversity, Irvingia wombolu, irvingia gabonensis, population structure, germplasm conservation, SilicoDArT, bush mango
Citation
Jepkemboi, S., & Ojola, P. (2023). Genetic diversity and population structure of Irvingia species using DArTseq generated markers. Forests, Trees and Livelihoods, 32(1), 42-54.