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Roots of orange-fleshed sweet potato varieties currently available in Nigeria contain high quantities of β-carotene or pro-vitamin A but have high moisture content. These varieties have been found to be a cheap and crucially important remedy for vitamin A deficiency. The cream or white-fleshed varieties, on the other hand, have a sweet taste with high dry matter content, giving a dry texture, a quality trait preferred in Nigeria. Development of sweet potato genotypes that can combine these two important quality traits is the objective of this breeding work. A diallel experiment using six parental sweet potato genotypes crossed in all possible combinations were carried out and thirty progenies were evaluated for beta carotene (β-carotene) and dry matter content in Landmark University, Omu Aran, Kwara State, Nigeria. The 30 F1 progenies along with their parental lines were planted in the same field trial. The trial was laid out in 6 x 6 triple lattice in two replications. Highly significant (P≤ 0.01) differences were observed among the genotypes for the traits. The average β-carotene content among the progenies was 2.86 (mg/100g.f.w) while the dry matter cttgontent had a mean value of 31.89%. The cross progenies 199024.2 x Excel had the highest beta carotene (14.37mg/100g.f.w) content with the highest dry matter content (40.10%) and are therefore recommended for further evaluation.
Reddy UK, Bates GT, Ryan-Bohac J, Nimmakayala P. Sweetpotato. In: Kole C (ed.) Genome mapping and molecular breeding in plants. New York: Springer. 2007;237-239.
Jarret RL, Gawel N, Whittemore A. Phylogenetic relationship of sweetpotato [Ipomoea batatas (L.) Lam.]. J. Amer. Soc. Hort. Sci. 1992;117:633-637.
Rees D, van Oirschot QEA, Amour R, Rwiza E, Kapinga R, Carey T. Cultivar variation in keeping quality of sweet potatoes. Postharvest Biol. Technol. 2003;28:313-325.
Jones A, Steinbauer CE, Pope DT. Quantitative inheritance of ten root traits in sweet potatoes. Journal of the American Society for Horticultural Science. 1969;94: 271-275.
Mukasa, SB, Rubaihayo, PR, Valkonen, JTP. Incidence of viruses and viruslike disease of sweetpotato in Uganda. Plant Disease. 2003;87:329-335.
Collins WP. Analysis of growth in Kennebec with emphasis on the relationship between stem number and yield. American Potato Journal. 1977;54: 33-40.
Mwanga ROM, Yencho GC, Moyer JW. Diallel analysis of sweetpotato for resistance to sweetpotato virus disease. Euphytica. 2002;128:237-248.
Hayman BI. The analysis of variance of diallel table. Biometrics 1954a;10:235-244.
Hayman BI. The theory and analysis of diallel crosses. Genetics. 1954b;39:789-809.
Hayman BI. The theory and analysis of diallel crosses. II. Genetics1958;43:63-85.
Hayman BI. The theory and analysis of diallel crosses. III. Genetics. 1960;45:155-172.
Dickinson AG, Jinks JL. A generalised analysis of diallel crosses. Genetics. 1956; 41:65-78.
Griffing B. Concept of general and specific combining ability in relation to diallel crossing systems. Aust. J. Biol. Sci. 1956;9:463-493.
Yan W, Hunt LA. Biplot analysis of diallel data. Crop Science. 2000;42:21-30.
Salami AE, Agbowuro GO. Gene action and heritability estimates OF grain yield and disease incidence traits of Low-N Maize (Zea mays L.) Inbred lines Agriculture And Biology Journal Of North America. 2016;7(2):50-54.
Rojas BA, Sprague GF. A comparison of variance components in corn yield trials: III. General and specific combining ability andtheir interaction with locations and years. Agron. J. 1952;44:462–6.
SAS Institute. SAS/STAT user’s guide. Version 6,4th ed. SAS Inst. Inc. Cary N.C., U.S.A. 1995;I-II.
Kathabwalika DM, Chilembwe EHC, Mwale VM. Evaluation of dry matter, starch and beta-carotene content in orange-fleshed sweet potato (Ipomoea batatas L.) genotypes tested in three agro-ecological zones of Malawi. African Journal of Food Science. 2016;10(11):320-326.
Tomlins K, Owori C, Bechoff A, Menya G, Westby A. Relationship among the carotenoid content, dry matter content and sensory attributes of sweet potato. Food Chemistry. 2012;131(1):14-21.
Burri BJ. Evaluating sweet potato as an intervention food to prevent vitamin A deficiency. Comprehensive Reviews in Food Science and Food Safety. 2011; 10,118–130.
Bechoff A, Westby A, Owori C, Menya G, Dhuique-Mayer C, Dufour D, et al. Effect of drying and storage on the degradation of carotenoids in orange-fleshed sweet potato varieties. Journal of the Science of Food and Agriculture. 2010;90:622–629.