University of Guilan Cereal Research 2252-0163 11 2 2021 09 21 Evaluation of genotype × environment interaction and grain yield stability of different bread wheat genotypes using non-parametric methods Evaluation of genotype × environment interaction and grain yield stability of different bread wheat genotypes using non-parametric methods 89 104 5161 10.22124/cr.2021.20461.1687 FA Sima Abyar Ph. D. Student, Dept. of Plant Breeding and Biotechnology, Faculty of Plant Production, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran Saied Navabpour Assoc. Prof., Dept. of Plant Breeding and Biotechnology, Faculty of Plant Production, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran Rahmatollah Karimizadeh Research Assist. Prof., Dryland Agricultural Research Institute, Kohgiloyeh and Boyerahmad Agricultural and Natural Resources Research and Education Center, Agricultural Research, Education and Extension Organization (AREEO), Gachsaran, Iran Ali Asghar Nasrollahnejad Ghomi Assist. Prof., Dept. of Plant Breeding and Biotechnology, Faculty of Plant Production, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran Ghafar Kiani Assoc. Prof., Dept. of Plant Breeding, Faculty of Crop Sciences, Sari Agricultural Sciences and Natural Resources University, Sari, Iran Amir Gholizadeh Research Assist. Prof., Dept. of Crop and Horticultural Science Research, Golestan Agricultural and Natural Resources Research and Education Center, Agricultural Research, Education and Extension Organization (AREEO), Gorgan, Iran Journal Article 2021 05 26 Water scarcity is the most essential limiting element of agricultural production, particulary in arid and semi-arid areas throughout the world. The line × environment interaction is a major challenge in the study of quantitative characters because it reduces yield stability in different environments and also it complicates the interpretation of genetic experiments and makes predictions difficult. In this regard to analysis of line × environment interaction and determine the yield stability of bread wheat genotypes, 15 new bread wheat lines along with Aftab cultivar were evaluated in a randomized complete block design with three replications in four experimental field stations (Gachsaran, Khoramabad, Moghan and Gonbad) during three cropping seasons. Results of combined analysis of variance indicated that the effects of environments, line and line × environment interaction were significant, suggesting that the lines responded differently in the studied environment conditions. So, there was the possibility of stability analysis. According to mean rank of nonparametric stability parameters, the lines G1, G3, G7 and G15 with the lowest value for mean rank were stable, whereas lines G2, G6, G8 and G10 with highest values were unstable. Also, the results indicated that the nonparametric statistics S_i⁽³⁾, S_i⁽⁶⁾, NP_i⁽²⁾, NP_i⁽³⁾, NP_i⁽⁴⁾, KR and Top were associated with mean seed yield and the dynamic concept of stability. Therefore, these methods were suitable for selecting stable and high yielding lines in bread wheat. Finally, G7 line with average grain yield and high general stability was the top line of this test, which after additional tests can be a candidate for a new cultivar to introduce. Water scarcity is the most essential limiting element of agricultural production, particulary in arid and semi-arid areas throughout the world. The line × environment interaction is a major challenge in the study of quantitative characters because it reduces yield stability in different environments and also it complicates the interpretation of genetic experiments and makes predictions difficult. In this regard to analysis of line × environment interaction and determine the yield stability of bread wheat genotypes, 15 new bread wheat lines along with Aftab cultivar were evaluated in a randomized complete block design with three replications in four experimental field stations (Gachsaran, Khoramabad, Moghan and Gonbad) during three cropping seasons. Results of combined analysis of variance indicated that the effects of environments, line and line × environment interaction were significant, suggesting that the lines responded differently in the studied environment conditions. So, there was the possibility of stability analysis. According to mean rank of nonparametric stability parameters, the lines G1, G3, G7 and G15 with the lowest value for mean rank were stable, whereas lines G2, G6, G8 and G10 with highest values were unstable. Also, the results indicated that the nonparametric statistics S_i⁽³⁾, S_i⁽⁶⁾, NP_i⁽²⁾, NP_i⁽³⁾, NP_i⁽⁴⁾, KR and Top were associated with mean seed yield and the dynamic concept of stability. Therefore, these methods were suitable for selecting stable and high yielding lines in bread wheat. Finally, G7 line with average grain yield and high general stability was the top line of this test, which after additional tests can be a candidate for a new cultivar to introduce. https://cr.guilan.ac.ir/article_5161_235c490b4d8720fca71b71557fc4ff37.pdf