National Research Centre for Onion and Garlic, Rajgurunagar 410 505, Pune
*Corresponding author's E-mail: vskrishnaprasad@yahoo.com
Forty four onion germplasm lines selected from gene pool were grown in three different seasons: kharif, late kharif and rabi in order to identify stable genotypes with high yield and suitable for cultivation in all the three seasons. The stability analysis revealed that significant GxE interactions for equatorial diameter, whereas nonsignificant interactions in all the attributes revealed that the genotypes did not differ in their linear response to different environments. Non-significant pooled deviation for all attributes suggests that variation in the performance of 44 lines tested over three environments was caused by predictable factors. Stability analysis further revealed that the genotypes NRCOG-888, 910, 922, 944 and 946 showed supremacy in marketable yield with below unit regression coefficient coupled with minimum deviation from regressions, indicating their stability in unfavorable environments and suitable for cultivation in all the three seasons of western India.
Onion, genotype x environment interactions, stability, ecovalence, regression coefficient
