Preprint Article Version 1 This version is not peer-reviewed

Climate Change and Fading Genetic Resources of Parkia biglobosa (Jacq.) in Nigeria Based on SSR Markers

Version 1 : Received: 19 October 2019 / Approved: 20 October 2019 / Online: 20 October 2019 (16:01:21 CEST)

How to cite: Popoola, J.; Agbolade, J.; Ajiboye, A.; Akinola, O.; Lewu, F.; Kioko, J.; Omonhinmin, C. Climate Change and Fading Genetic Resources of Parkia biglobosa (Jacq.) in Nigeria Based on SSR Markers. Preprints 2019, 2019100235 (doi: 10.20944/preprints201910.0235.v1). Popoola, J.; Agbolade, J.; Ajiboye, A.; Akinola, O.; Lewu, F.; Kioko, J.; Omonhinmin, C. Climate Change and Fading Genetic Resources of Parkia biglobosa (Jacq.) in Nigeria Based on SSR Markers. Preprints 2019, 2019100235 (doi: 10.20944/preprints201910.0235.v1).

Abstract

African locust bean (Parkia biglobosa (Jacq.) is a multi-purpose economic tree with genetic potentials in sub-Saharan Africa. Its cultivation and production is declining with increased aging and genetically threatened throughout its natural ranges. Research efforts are needed to change the present scenario to sustainable cultivation and utilization, hence this present study. This study was aimed at evaluating genetic diversity and geographical spread relationships of twenty landraces collected from different ecological zones of Nigeria using simple sequence repeat (SSR) markers. Ten SSR markers were screened and five primers (PbL02, PbL03, PbL04, PbL05 and PbL09) were selected based on clear amplification products and reproducible scorable bands. The SSR primers detected a total of 55 alleles ranged from 10 to 14 alleles with a mean of 11. The percentage polymorphisms were high and ranged from 68.75 % in PbL04 to 84.21 % in PbL05 with a mean of 74.16 %. The polymorphic information content (PIC) was in the range of 0.31 in PbL02 to 0.37 in PbL09. The genetic diversity and heterozygosity values ranged from 0.39 to 0.50 and 0.00 to 0.68 while the average genetic distance for all pair wise comparisons was 0.31.The first five Principal Component (PC) accounted for 70.20 % of the total variation out of which PC1 (31.50%) and PC2 (19.20%) extracted 49.70% molecular similarity. The dendrogram resulted in separation of the 19 landraces into three major clusters based on unweighted pair group method with arithmetic average. Cluster I comprised of five landraces: ABNo130 and BENo023; OYNo11, KANo125 and NiNo262 while cluster II had only one (BANo116). Cluster III was diverse comprising 13 landraces: ZANo188, KNNo162, KENo220, GMNo076 and EbNo260, ADNo64, EdNo164, KANo137, KENo217, KwNo270, NiNo241, OsNo206 and PLNo120. The homogeneity of alleles among the studied landraces suggested suspicion of loss of genetic intra-specific variation among the landraces of P. biglobosa which calls for concerted efforts toward better cultivation, conservation, management, utilization and genetic improvement of the species in Nigeria.

Subject Areas

African locust bean; climate change; cluster analysis; genetic intra-specific diversity; polymorphic information content; food and nutrition security

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