_____________________________________________________________________________________________________ *Corresponding author: E-mail: akintundeadewole@gmail.com; Journal of Experimental Agriculture International 30(4): 1-14, 2019; Article no.JEAI.46290 ISSN: 2457-0591 (Past name: American Journal of Experimental Agriculture, Past ISSN: 2231-0606) Assessment of Diversity among Tropical and Subtropical Maize Inbreds Based on Morphological Traits and Carotenoid Content Adewole Akintunde 1* , Gbadebo Olaoye 1 and Samuel Adelowo Olakojo 2 1 Department of Agronomy, University of Ilorin, Ilorin, Nigeria. 2 Institute of Agricultural Research and Training, Obafemi Awolowo University, Moor Plantation, Ibadan, Nigeria. Authors’ contributions The study was carried out in collaboration with the other co-authors. Author AA designed and carried out the study, performed the statistical analysis, and wrote the first draft of the manuscript. Author GO provided some guides for field operations and read the draft manuscript. Author SAO provided germplams, laboratory facility for nutrient analysis and literature search. The three authors read and approved the final manuscript for publication. Article Information DOI: 10.9734/JEAI/2019/46290 Editor(s): (1) Dr. Marco Aurelio Cristancho, Professor, National Center for Coffee Research, CENICAFÉ, Colombia. (2) Dr. Daniele De Wrachien, Professor, State University of Milan, Italy. Reviewers: (1) Cem Ömer Egesel, Çanakkale Onsekiz Mart University, Turkey. (2) Sayo Sesay, Sierra Leone Agricultural Research Institute, West Africa. (3) Jin Seop Bak, Kyonggi University, South Korea. Complete Peer review History: http://www.sdiarticle3.com/review-history/46290 Received 27 October 2018 Accepted 09 January 2019 Published 04 February 2019 ABSTRACT The available maize germplasm contains sufficient genetic variability for pro-vitamin A content which could be utilized for development of pro-vitamin enriched varieties aimed at reducing vitamin A deficiency among millions of resource-limited Africans. Fifty-one maize inbred lines from Nigeria and CIMMYT (Zimbabwe) comprising of thirty-seven yellow and fourteen white endosperm types were evaluated in replicated trials at the Institute of Agricultural Research and Training, Moor Plantation, Ikenne and the Teaching and Research farm, University of Ilorin. The objective was to assess the extent of diversity among the inbreds using morphological traits and carotenoid content. The results showed wide variability (P = .05) among the inbred lines for grain yield and other traits as well as total carotenoids. Differences in weather factors in the two locations significantly affected the Original Research Article