TY  - JOUR
N2  - 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.
N1  - This multi-year work was made possible through the generous support of the Tropical Legumes II project funded by Bill and Melinda Gates Foundation, Improving groundnut farmer incomes and nutrition through innovation and technology enhancement (I-FINITE), funded by USAID Zambia and the McKnight Foundation supported groundnut variety improvement for yield and adaptation, human health and nutrition in Malawi. The authors thank research technicians from the National Agricultural Research Systems (NARs) in the different countries where the evaluations were conducted for their support and engagement in the work.
AV  - public
KW  - Adaptation
KW  -  AMMI
KW  -  Breeding
KW  -  Stability
KW  -  Multi-environment trials
KW  -  Discrimination ability
KW  -  Representativeness
A1  - Okori, P
A1  - Charlie, H J
A1  - Mwololo, J K
A1  - Munthali, T W
A1  - Kachulu, L
A1  - Monyo, E
A1  - Muitia, A
A1  - Mponda, O
A1  - Okello, D K
A1  - Makweti, L
A1  - Siambi, M
TI  - Genotype-by-environment interactions for grain yield of Valencia groundnut genotypes in East and Southern Africa
UR  - https://doi.org/10.21475/ajcs.19.13.12.p2039
JF  - Australian Journal of Crop Science
SP  - 2030
Y1  - 2019/12//
ID  - icrisat11368
EP  - 2037
SN  - 1835-2707
IS  - 13(12)
ER  -