Table 1 List of heat stress indices (HIs) along with their formulas used in the study.
From: Assessing alpha lattice design for heat stress indices and yield stability in wheat genotypes
S. No. | Heat Indices | Abbreviations | Formulas | References |
|---|---|---|---|---|
1 | Heat susceptibility index | HSI | (1-Ysi/Ypi)/(1-Ys-Yp) < 1.0 = stress tolerant > 1.0 = stress susceptible | |
2 | Stress tolerance index | STI | (Ysi × Ypi)/(Yp)2 | |
3 | Stress tolerance | TOL | Ypi - Ysi | |
4 | Stress susceptibility % index | SSPI | ((Ypi-Ysi)/(2 X Yp)) X 100 | |
5 | Yield index | YI | Ysi/Ys | |
6 | Yield stability index | YSI | Ysi/Ypi | |
7 | Heat tolerance efficiency | HTE | (Ysi/Ypi) X 100 | |
8 | Relative heat index | RHI | (Ysi/Ypi)/(Ys/Yp) | |
9 | Mean productivity | MP | (Ypi + Ysi)/2 | |
10 | Geometric mean productivity | GMP | √ (Ypi × Ysi) | |
11 | Harmonic Mean | HM | 2 × (Ypi × Ysi)/(Ypi + Ysi) | |
12 | Mean relative performance | MRP | (Ysi/Ys) + (Ypi/YP) | |
13 | Reduction | RED | (Yp - Ys)/Yp X 100 | |
14 | Golden Mean | GM | (Ypi + Ysi)/(Ypi - Ysi) | |
15 | Heat resistance index | HRI | Ysi X (Ysi/Ypi)/Ys) |
