Genetic diversity assessment and preliminary evaluation of cowpea (Vigna unguiculata cv grp. unguiculata) germplasm
2014
de Chavez, H.D. | Borines, N.O.M. | Capistrano, M.R. | Dolores, L.M. | Borromeo, T.H.
Information on the diversity and evaluation of cowpea accessions conserved at the genebank is essential to increase its utilization especially in the face of climate change. Eighty-five accessions were sown in the experimental field of University of the Philippines Los Baños (UPLB). Preliminary field agronomic evaluation was conducted. Selected accessions were analyzed for nutraceutical properties. Shannon-Weaver diversity index (H1) showed that there is high diversity in twinning tendency, seed main color, pod attachment to peduncle seed shape and plant hairiness. For quantitative traits, high diversity was observed in 21 out of 29 characters including standard petal length, 100-seed weight, seed length, percentage of first harvest, number of raceme per plant, number of seeds per pod, seed length, seed thickness, number of pods per plant, yield per plant, maturity and plant height among others. Two cowpea accessions were rated highly resistant to virus diseases while nine accessions showed resistance to leaf spot, few accessions exhibited rust and powder mildew symptoms. Aphids and leafhoppers were observed but with no major damage. Five cowpea accession were identified promising by legume breeders based on twinning tendency and color of seeds. Two accessions showed high phenolics content.
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