The primary objective of this study was to assess the effects of genotype (G), location (L), and G × L interaction on tuber quality traits (dry matter content and starch pasting parameters) in white Guinea yam (Dioscorea rotundata Poir.). Variability in tuber dry matter and starch pasting properties was examined using 18 advanced breeding lines and two dominant landrace cultivars of white Guinea yam grown in three different agroecological zones (forest‒savanna transition, southern Guinea savanna, and rainforest) in Nigeria. The starch pasting properties were evaluated using a Rapid Visco Analyser. Our results show that the G × L interaction effect was low compared to the genotype and growing location effects on the variability of key starch properties. In addition, the repeatability of trait performance across locations was high and relatively uniform for key traits, suggesting that any of the three locations used in this study can be employed for their evaluation. Furthermore, TDr1100873 had a higher dry matter content than the dominant landrace cultivars (Amula and Meccakusa) but was similar to them in starch pasting properties. Hence, TDr1100873 is considered a suitable variety for future breeding activities.

https://dx.doi.org/10.3390/agronomy11101944

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Ryo Matsumotohttps://orcid.org/0000-0002-0106-6728

Asrat Asfawhttps://orcid.org/0000-0002-4859-0631

David De Koeyerhttps://orcid.org/0000-0001-8064-6538

Haruki Ishikawahttps://orcid.org/0000-0001-6215-2622

Patrick Adebolahttps://orcid.org/0000-0002-5155-6194

Robert Asieduhttps://orcid.org/0000-0001-8943-2376

https://dx.doi.org/10.3390/agronomy11101944

Biotech and Plant Breeding; Plant Production and Health

Agronomy; Food Security; Plant Breeding; Plant Health; Plant Production; Value Chains; Yam

Yams; Starch; Dry Matter Content; Tubers; Genotypes; Stability

Africa; West Africa

Nigeria

Headquarters and Western Africa Hub

Agronomy