Comparing Two Statistical Models for Studying Genotype x Environment Interaction and Stability Analysis in Flax
Journal Title: International Journal of Farming and Allied Sciences - Year 2016, Vol 5, Issue 4
Abstract
This study was conducted at the Agricultural Research Station, Cairo University at Giza Governorate, Egypt during 2011/2012 and 2012/2013 seasons to assess genotype x environment interaction and stability of straw and seed yields of seven flax cultivars, namely Sakha 1, Sakha 2, Sakha 3, Sakha 4, Giza 9, Giza 10 and S.46/4 under different nitrogen levels i.e. 20, 35 and 50 kg N/fad. The field experiments were laid out in a split-plot design with three replications in both years. The obtained results showed that fertilizer rate (50 kg N /fed) was the most suitable environment for straw yield. On the other hand the fertilizer rate (35 kg N/fed) was the most suitable environment for seed yield. Combined analysis of variance of straw and seed yields of seven cultivars tested at six environments showed highly significant (p<0.01) difference between the cultivars, environments and GEI, suggesting differential response of cultivars across testing environments and the need for stability analysis. Several biometrical methods are available for analysis of G-E interaction and yield stability. The models of Eberhart and Russell (1966) and genotype plus GE interaction (GGE) biplot analysis applied to study genotype x environment interaction and were compared for their efficiency empirically. The results indicated that the environments of evaluation greatly differed. The results indicated that the environments of evaluation greatly differed. Both statistical stability models, i. e. Eberhart and Russell (1966) as well as (GGE) biplot analysis, indicated that cultivars Sakha 1, Sakha 2 and Giza 9 were the most high yielding and stable cultivars for straw yield and only cultivar Sakha 2 for seed yield. Stability analysis revealed that some cultivars considered stable for straw yield were found to be unstable for seed yield. This result suggests that stability of a complex trait (such as seed yield) may not depend on stability of straw yield trait. Different stability parameters explained genotypic performance differently, irrespective of straw and seed yield performance. It was accordingly concluded that assessment of G × E interaction and yield stability should not be based on a single or a few stability parameters but rather on a combination of stability parameters. The GGE-biplot method was a more efficient tool to analyze GE interaction, because it can provide the biplots and information on genotype, environment and their interaction, while the Eberhart and Russell analysis give information only on genotype evaluation.
Authors and Affiliations
Ashraf A. Abd El Mohsen, Mohamed M. Amein
Keywords
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