Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Genotype-by-Environment Interaction for Yam (Dioscorea species) Mosaic Virus Resistance, Dry Matter Content, and Yields in Uganda

Emmanuel Amponsah Adjei
* ORCID logo ,
Williams Esuma
,
Titus Alicai
ORCID logo ,
Emmanuel Boache Chamba
,
Richard Edema
,
Isaac Onziga Dramadri
,
Alfred Adebo Ozimati
,
Rolland Agaba
,
Thomas Lapaka Odong
Version 1 : Received: 13 July 2022 / Approved: 18 July 2022 / Online: 18 July 2022 (10:56:10 CEST)

A peer-reviewed article of this Preprint also exists.

Adjei, E.A.; Esuma, W.; Alicai, T.; Chamba, E.B.; Edema, R.; Dramadri, I.O.; Ozimati, A.A.; Agaba, R.; Odong, T.L. Genotype-by-Environment Interaction of Yam (Dioscorea species) for Yam Mosaic Virus Resistance, Dry Matter Content and Yield in Uganda. Agronomy 2022, 12, 1984. Adjei, E.A.; Esuma, W.; Alicai, T.; Chamba, E.B.; Edema, R.; Dramadri, I.O.; Ozimati, A.A.; Agaba, R.; Odong, T.L. Genotype-by-Environment Interaction of Yam (Dioscorea species) for Yam Mosaic Virus Resistance, Dry Matter Content and Yield in Uganda. Agronomy 2022, 12, 1984.

Abstract

Often yam varieties grown in different agro-ecologies show differential responses across production environments, a term known as genotype-by-environment interaction. Genotype-by-environment interaction makes selecting the best genotypes under varied production environments more complex. This study tested twenty yam genotypes evaluated in six test environments to assess genotype, environment, and the interaction between genotypes and environmental effect for tuber yield, yam mosaic virus, and dry matter content. The experiments were conducted in two seasons across three locations in Uganda using a randomized complete block design with three replications. The results showed a significant effect (p ≤ 0.001) for genotype (G), environment (E), and genotype by environment interaction for all the traits. Serere 2021 and Namulonge 2021 were identified as the most discriminating and representative environments for testing the yam mosaic virus, respectively. Serere 2021 was recognized as the most discriminating environment, whereas Arua 2021 was identified as the closest to an ideal environment for assessing yam tuber yields. The tested genotypes also exhibited high resistance to yam mosaic virus disease, high tuber yields, and high dry matter content. Genotypes UGY16020, UGY16034, UGY16042, and UGY16080 demonstrated great resistance to yam mosaic virus disease, high yielding, and considerable dry matter content and are thus potential parents for yam improvement. Further evaluation of the four genotypes should be done under farmers' production systems for selection, improvement, and release as new yam varieties for Uganda

Keywords

Dioscorea; yield stability; environments; genotype; dry matter; disease resistance; Uganda

Subject

Biology and Life Sciences, Agricultural Science and Agronomy

Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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