Harnessing genotype-by-environment interaction to determine adaptability of advanced cowpea lines to multiple environments in Uganda
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Date
2020
Journal Title
Journal ISSN
Volume Title
Publisher
Journal of Plant Breeding and Crop Science
Abstract
This study was conducted to determine the yield stability of advanced cowpea lines in diverse agroecological
zones of Uganda in order to facilitate documentation requirements for national performance
trials (NPT). Thirty cowpea genotypes were evaluated against six checks in three localities, over three
growing seasons, making a total of 9 unique environments. The trials were laid in a 6x6 alpha lattice
design with three replications and grain yield was the principal trait measured. Single-site and multilocation
data were summarized using analysis of variance. Further analysis of stability was visualized
using the genotype and genotype by environment interaction (GGE) biplot and the additive main effect
and multiplicative interaction (AMMI) models. ANOVA depicted highly significant differences among the
genotypes, locations, seasons and GEI for grain yield. Based on AMMI analysis, environmental effect
accounted for the most variation (84.7%) in the phenotype followed by GE (9.45%) and genotypes
(4.45%), alluding to the complex inheritance of grain yield in cowpea. The polygon view and the average
environment coordination view of the GGE biplot revealed Ayiyi as the wining genotype in the major
mega environment and the most stable and high yielding across environments respectively. The
genotypes Ayiyi, WC64 and ALEGIxACC2 yielded higher than the checks and were very stable. The
other genotypes G36 (WC 36), G3 (ACC12xSECOW3B), G32 (WC16), and G14 (MU9) did not outperform
the checks but displayed high yield stability and the mean yields were above the overall average. These
genotypes were considered desirable for advancement to National Performance Trial for potential
release as new improved cowpea cultivars.
Description
Keywords
Cowpea (Vigna unguiculata L. Walp), Additive main effect and multiplicative interaction (AMMI), Genotype and genotype by environment interaction (GGE), Stability, Grain yield
Citation
Abiriga, F., Ongom, PO, Rubaihayo, PR, Edema, R., Gibson, PT, Dramadri, I., & Orawu, M. (2020). Harnessing genotype-by-environment interaction to determine adaptability of advanced cowpea lines to multiple environments in Uganda. Journal of Plant Breeding and Crop Science , 12 (2), 131-145. DOI: 10.5897/JPBCS2020.0891