An index for simultaneous selection of genotypes for high yield and stability under incomplete genotype x environment data

Abstract

A family of simultaneous selection indices is proposed here, which can be used for selecting genotypes simultaneously for high yield and stability under incomplete genotype x environment situations. Three indices are proposed by assigning different weights to yield (w1) and stability (w2) as w1=0.8, w2 =0.2 (I1); w1=0.7, w2 =0.3 (I2); w1=0.6, w2 =0.4 (I3). These indices are tested for their performance based on Pearsonian correlations between yield based ranks and index based ranks, stability based ranks and index based ranks on groundnut data. It was found that the performance of I1 index is best for selecting high yielders as well as stable performers to the extent of 0%–10% of incompleteness in genotype x environment data. Among the top 4 out of 15 varieties selected based on I1, it is found that 2 – 3 are high yielders and high stable performers for 0%–10% of incompleteness.