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.
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Claims 11
Claim · model-written summary
Irvingia populations showed high genetic differentiation.
IrvingiaOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“6532 SilicoDArT markers revealed high genetic differentiation among populations (phiPT = 0.301, P = .001)”
t0“Irvingia species”
Claim · model-written summary
Overall Nei gene diversity was low at He = 0.117.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The overall genetic diversity revealed by Nei’s gene diversity (He = 0.117) and percentage of polymorphic loci (39.60%) was low”
t0“Irvingia species”
Claim · model-written summary
The percentage of polymorphic loci was low at 39.60%.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The overall genetic diversity revealed by Nei’s gene diversity (He = 0.117) and percentage of polymorphic loci (39.60%) was low”
t0“Irvingia species”
Claim · model-written summary
Cameroon provenances of I. gabonensis were more diverse than Gabonese populations.
- Taxon
- I.gabonensis
Irvingia gabonensise0 - Outcome
- more diversee0
- Direction
- more diversee0
- Comparator
- Gabonese populationse0
- Setting
- Cameroone0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“I.gabonensis provenances from Cameroon and Nigeria were more diverse than Gabonese populations”
Claim · model-written summary
Nigeria provenances of I. gabonensis were more diverse than Gabonese populations.
- Taxon
- I.gabonensisIrvingia gabonensise0
- Outcome
- more diversee0
- Direction
- more diversee0
- Comparator
- Gabonese populationse0
- Setting
- Nigeriae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“I.gabonensis provenances from Cameroon and Nigeria were more diverse than Gabonese populations”
Claim · model-written summary
Pairwise phiPT separated I. wombolu and I. gabonensis.
- Taxon
- I. wombolu and I. gabonensisIrvingia gabonensisIrvingia wombolue0
- Outcome
- delineated I. wombolu and I. gabonensise0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Pairwise phiPT values calculated from AMOVA variances delineated I. wombolu and I. gabonensis”
Claim · model-written summary
Population analyses put Cameroon at the distribution center of I. gabonensis accessions from Nigeria and Gabon.
- Taxon
- I. gabonensisIrvingia gabonensise0
- Outcome
- center of distributione0
- Setting
- Cameroone0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“placed Cameroon at the center of distribution of I. gabonensis accessions from Nigeria and Gabon”
Claim · model-written summary
Gabonese accessions tended to cluster apart from Nigerian accessions.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Gabonese accessions tend to cluster independent of Nigerian accessions”
t0“Irvingia species”
Claim · model-written summary
I. wombolu formed a distinct cluster from I. gabonensis.
- Taxon
- I. womboluIrvingia wombolue0
- Outcome
- distinct clustere0
- Comparator
- I. gabonensise0
Verbatim
e0“I. wombolu formed a distinct cluster from I. gabonensis”
Claim · model-written summary
SilicoDArT markers were suitable for Irvingia population structure and differentiation analysis.
- Outcome
- suitable for population structure and differentiation analysise0
Not reportedComparatorValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“SilicoDArT markers were found suitable for population structure and differentiation analysis of Irvingia accessions”
t0“Irvingia species”
Claim · model-written summary
The markers can guide future genebank recollections for domestication materials.
- Outcome
- future recollections to enrich genebank diversity and materials for domestication eventse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“can guide future recollections to enrich genebank diversity and materials for domestication events”
t0“Irvingia species”