ANALYSIS OF GENETIC POLYMORPHISM FOR SCAB RESISTANT COWPEA VARIETIES USING SSR AND SNP MARKERS

Joseph Olasan Olalekan; Celestine Uzoma Aguoru; Amos Abama Joshua; Ekeruo Godspower Chibuike; Ugbaa Macsamuel Sesugh

doi:10.47743/jemb-2025-212

Authors

Joseph Olasan Olalekan
Celestine Uzoma Aguoru
Amos Abama Joshua Plant science and Biotechnology unit
Ekeruo Godspower Chibuike
Ugbaa Macsamuel Sesugh

DOI:

https://doi.org/10.47743/jemb-2025-212

Keywords:

cowpea, Scab resistance, SSR Markers, SNP Markers, Genetic Polymorphism, Disease resistance

Abstract

Cowpea scab disease, caused by Sphaceloma sp., significantly reduces yield. This study screened nine cowpea varieties for resistance to scab using both phenotypic and molecular markers (SSR and SNP). The varieties were artificially inoculated, and disease incidence and severity were recorded. Genetic analysis with SSR markers revealed polymorphisms between resistant and susceptible varieties. Results showed significant genetic diversity among cowpea varieties, with IT99K-573-1-1 and TVx-3236 being resistant, while FUAMPEA-4 and UAM-09-130-20-4 were susceptible. SSR markers CP 29/30, CLM 0348, and CP 67/68 were the most informative in tracking resistance.

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