Parametric stability analysis of durum wheat yield (triticum durum desf)

Abstract

The study purpose was to assess the phenotypic stability of 23 durum wheat genotypes using different stability parameters to identify both high-yielding and stable genotypes.

Materials and methods. The study was carried out at 4 trial sites differing in soil and hydrothermal conditions in 2008/09 - 2009/10. To quantify the yield stability, 7 statistical parameters of the stability (bi, Pi, ASVi, CVi, S2di, S2i, and W2i) were calculated.

Results and discussion. The grain yields of all the genotypes were significantly affected by growing conditions, which accounted for 88.2% of the total variance of the yield, while the contributions of the genotype and genotype-environment interactions only amounted to 2.9% and 8.9%, respectively. There were significant positive correlations between the average yield of the genotypes under investigation and the regression coefficient (bi) and between the average yield of the genotypes and the environment variance (S2i). Correlation analysis also separated Pi, bi, and S2i approaches that correlated with the average yield and ASV, W2i, and S2di approaches that evaluate the phenotypic stability of the genotypes regardless of the yield.

Conclusions. The results show that the genotypes Bel, Amg, Miki, Bss and Msb were the most stable by the majority of the statistical models used. Miki, Amg and Msb were distinguished as the best genotypes combining high yield and high stability under various conditions.