African Crop Science Journal, Vol. 22, No. 2, pp. 123 - 136 ISSN 1021-9730/2014 $4.00 Printed in Uganda. All rights reserved © 2014, African Crop Science Society MORPHOLOGICAL AND AGRONOMIC TRAITS VARIATIONS FOR MUNGBEAN VARIETY SELECTION AND IMPROVEMENT IN UGANDA A. WANIALE, N. WANYERA1 and H. TALWANA School of Agricultural and Environmental Sciences, Makerere University, P. O. Box 7062, Kampala, Uganda 1National Semi-Arid Resources Research Institute, National Agricultural Research Organization, P. O. Box Soroti, Uganda Corresponding author:
[email protected] (Received 18 December, 2013; accepted 5 May, 2014) ABSTRACT Mungbean (Vigna radiata L. Wilczek), is a pulse species that is widely cultivated in sub-tropical and tropical regions of the world. Unfortunately, the yield of mungbean in Uganda is very low mainly due to inherent genotype failures and losses due to pests and diseases. To achieve a gain in yield through breeding requires collection, characterisation, and evaluation of germplasm, as the first step in identifying genotypes with the desired characteristics. The objective of this study was to describe the nature and extent of genotypic variation among mungbean collections for a range of traits of potential agronomic and adaptive interests in Uganda. A total of 35 mungbean accessions acquired mainly from the World Vegetable Centre (AVRDC) in Taiwan, two local ricebean (Vigna umbellata (Thunb.) Ohwi and Ohashi) and one local blackgram genotype (Vigna mungo) were evaluated for several diverse traits for two cropping seasons at two different locations in Uganda. Genotype by environment interaction (GEI) was significant (P < 0.001) for all the traits, indicating inconsistent performance by some genotypes across two locations and two seasons.