relation: http://oar.icrisat.org/11368/
title: Genotype-by-environment interactions for grain yield of Valencia groundnut genotypes in East and Southern Africa
creator: Okori, P
creator: Charlie, H J
creator: Mwololo, J K
creator: Munthali, T W
creator: Kachulu, L
creator: Monyo, E
creator: Muitia, A
creator: Mponda, O
creator: Okello, D K
creator: Makweti, L
creator: Siambi, M
subject: Plant Breeding
subject: Crop Yield
subject: Groundnut
subject: Genetics and Genomics
subject: Legume Crops
subject: Southern Africa
subject: East Africa
description: Grain yield is a quantitatively inherited trait in groundnut (Arachis hypogea L.) and subject to genotype by environment interactions. Groundnut varieties show wide variation in grain yield across different agro-ecologies. The objectives of this study were to evaluate Valencia groundnut genotypes for yield stability and classify environments to devise appropriate breeding strategies. Seventeen multi-location trials were conducted in six countries, viz., Malawi, Tanzania, Uganda, Zimbabwe, Mozambique and Zambia, from 2013 to 2016. The experiments were laid out following a resolvable incomplete block design, with two replications at each location (hereafter referred to as ‘environments’) using 14 test lines and two standard checks. The additive main effects and multiplicative interaction (AMMI) analysis was conducted. Variation attributable to environments, genotypes and genotype × environment interaction for grain yield was highly significant (P<0.001). Genotype, environment and genotype × environment interactions accounted for 7%, 53 % and 40% of the total sum of squares respectively. Superior-performing genotypes possessing high to moderate adaptability and stability levels included ICGV-SM 0154, ICGV-SM 07539, ICGV-SM 07536, ICGV-SM 7501, ICGV-SM 99568 and ICGV SM 07520. Nachingwea 2013 in Tanzania, Nakabango 2014 in Uganda and Chitedze 2015 in Malawi were the most representative and discriminative environments. Considering the implications of interactions for Valencia groundnut breeding in East and Southern Africa we propose that different varieties should be targeted for production in different environments and at the same time used for breeding in specific environments.
date: 2019-12
type: Article
type: PeerReviewed
format: application/pdf
language: en
identifier: http://oar.icrisat.org/11368/1/mwololo_13_12_2019_2030_2037.pdf
identifier:   Okori, P and Charlie, H J and Mwololo, J K and Munthali, T W and Kachulu, L and Monyo, E and Muitia, A and Mponda, O and Okello, D K and Makweti, L and Siambi, M  (2019) Genotype-by-environment interactions for grain yield of Valencia groundnut genotypes in East and Southern Africa.  Australian Journal of Crop Science (13(12)).  pp. 2030-2037.  ISSN 1835-2707     
relation: https://doi.org/10.21475/ajcs.19.13.12.p2039
relation: doi:10.21475/ajcs.19.13.12.p2039