AMMI and GGEbiplot Model in Selection of New Taro Cultivars Under Different Agro-Ecological Zones in Papua New Guinea

Atung. Cyril Waki, Jeffrey. Ko


Yield is an economically important trait considered by farmers engaged in taro production. The objective of the present study was to increase genetic diversity and assess the yield stability performance of the new taro cultivars evaluated under different environments. Fourteen cultivars were evaluated for two years 2013-2014 and 2015-2016 including other cultivars. The trial was planted in an augmented design and data was pooled and analyse as a randomised complete block design. The corm yields analysed using the additive main effect and multiplicative interaction (AMMI) and genotype and genotype by environment interaction (GGE) biplot. The additive main effects and multiplicative interaction model (AMMI) analysis of variance showed significant differences for genotype, environment and genotype by environment interaction. The result showed 31% of the total variation was accounted by environment while genotype and interaction accounted for 16.6 and 26.4%, showing significant differences. The highest variation by environment, (GXE) indicates that the genotypes performed differently across environments. The C5-353 was the ideal genotype with both high yield and high stability as indicated by the AMMI stability value (ASV) analysis and yield stability index (YSI) showing wider adaptability. The other most stable genotypes were BL/SM/43 and BL/SM/148. The GGE biplot indicated that M02 was the most stable environment and C5-353 was the most stable cultivar.

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