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Potencial legumes, such as cowpea (Vigna unguiculata [L.] Walp.), is one of the important genetic resource material. Cowpea relatively has more tolerant to drought comparing with other legumes. Characterization of cowpea genetic resources had been done on 106 of ICABIOGRAD collection. This characterization was conducted in order to know accenssions has good characters as gene resources for developing new varieties. Accessions which have rapid harvesting time were KTn81, Tunggak 16, TVX.4667n 010, and TVX.2939n09D at 59 days. The highest number of pods per plant was 8 clusters per plant, yielded by Kacang Dadap 125, and Tunggak Hitam 24. Accession with largest grain size was Tunggak Hitam 13 (black cowpea) (16.9 g/100 grains), while highest grain yield was Wajak 132 (104.9 g/50 plants). Phenotypic diversity of cowpea genetic resources in the collection was relatively narrow, so it was necessary to increase its diversity through introduction, collection, and crossing. Abstrak Kacang-kacangan potensial seperti kacang tunggak (Vigna unguiculata [L.] Walp.) merupakan sumber daya genetik (SDG) yang penting. Tanaman kacang tunggak memiliki sifat relatif lebih tahan kering dibanding dengan kacang-kacangan yang lain. Karakterisasi SDG kacang tunggak telah dilakukan sebanyak 106 aksesi koleksi BB Biogen. Karakterisasi dilakukan dengan tujuan untuk mengetahui aksesi-aksesi yang memiliki karakter baik yang dapat dijadikan sebagai sumber gen untuk merakit varietas unggul. Diketahui bahwa aksesi SDG kacang tunggak yang cepat dipanen, yaitu aksesi KTn81, Tunggak 16, TVX.4667n 010, dan TVX.2939n09D pada umur 59 hari. Jumlah gerombol polong tiap tanaman terbanyak dihasilkan oleh aksesi Kacang Dadap 125 dan Tunggak Hitam 24 sebanyak 8 klaster/tanaman. Ukuran butir terbesar dimiliki oleh aksesi Tunggak Hitam 13 (16,9 g/100 butir) dan hasil biji tertinggi dihasilkan oleh aksesi Wajak 132 (104,9 g/50 tanaman). Keragaman fenotipik koleksi SDG kacang tunggak relatif sempit, sehingga perlu dilakukan peningkatan keragaman SDG kacang tunggak baik melalui introduksi dan koleksi maupun persilangan.

Keragaman Karakter Morfo-Agronomis Sumber Daya Genetik Kacang Tunggak (Vigna unguiculata [L.] Walp.) Koleksi Bank Gen BB Biogen