Comparison of Non Parametric Stability Statistics for Improvement of Adaptation in Wheat-Rye Disomic Addition Lines
Ezatollah Farshadfar *
Campus of Agriculture and Natural Resources, Razi University, Kermanshah, Iran and Department of Agronomy and Plant Breeding, Kermanshah Branch, Islamic Azad University, Kermanshah, Iran.
Zahra Bahadori
Department of Agronomy and Plant Breeding, Kermanshah Branch, Islamic Azad University, Kermanshah, Iran.
*Author to whom correspondence should be addressed.
Abstract
In order to study phenotypic stability of wheat-rye disomic addition lines and comparison of non-parametric stability procedures, a randomized complete block design with three replications was carried under three different environments. Biplot analysis of stability measures classified them into three groups. Group 1 included the mean yield with non-parametric measure Ysi. The PCs axes separated non-parametric measures Si(1), Si(2), NPi1 and SDR in group 2. Non-parametric measures: Si(3), Si(4), NPi2, NPi3, NPi4, R and RSM were placed in Group 3. According to Spearman’s rank correlation coefficient Ysi indicated high level of correlation with mean yield and based on Ysi genotypes G2, G5, G7, G4 and G9 were introduced as stable genotypes. Non-parametric stability parameters of group 2, introduced genotypes G2 and G1 as stable and genotypes G6 and G8 as unstable entries. According to procedures of group 3 genotypes G2 was identified as stable and genotype G6 with th highest values as unstable. Most of the stability methods indicated that the genotype G2 was the most phenotypically stable with high mean yield indicating that QTLs controlling yield and stability are located on chromosome 2R of rye (G2).
Keywords: Rey, disomic addition lines, stability, nonparametric methods.