Table 1.
Agronomic traits (mean ± standard deviation) and drought-tolerance index (DTI) evaluated on twelve rice genotypes under well-watered (W) and drought (D) conditions. “*”, “**”, and “***” indicate significant differences between W and D at p < 0.05, p < 0.01, and p < 0.001 via independent t test. DTIB or DTIY is calculated as Pd/PW*(Pd/Pad). Pd is referred as biomass/yield in D, Pw is referred as biomass/yield in W, and Pad is referred as averaged biomass/yield of total rice genotypes in D
| Code | Materials | Ratio of dead leaf | Seed set rating in W (%) | Seed set rating in D (%) | Biomass in W (g) | Biomass in D (g) | Yield per plant in W (g) | Yield per plant in D (g) | Harvest index in W | Harvest index in D | DTIB | DTIY |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| S3 | IAC1246b | 0.241 | 68.0 ± 1.4 | 80.4 ± 6.1 | 28.35 ± 2.00 | 19.64 ± 0.75* | 10.65 ± 0.32 | 7.89 ± 0.42** | 0.402 ± 0.025 | 0.378 ± 0.029 | 1.053 | 1.680 |
| S6 | Hanhui-3b | 0.359 | 51.0 ± 0.8 | 23.7 ± 4.5** | 27.60 ± 1.99 | 19.23 ± 1.16* | 7.61 ± 0.29 | 1.17 ± 0.30*** | 0.063 ± 0.036 | 0.278 ± 0.035*** | 1.037 | 0.052 |
| S9 | CICA4a | 0.410 | 69.2 ± 2.6 | 56.0 ± 10.6 | 13.67 ± 1.16 | 8.03 ± 0.73* | 6.34 ± 0.54 | 2.03 ± 0.53** | 0.244 ± 0.082 | 0.463 ± 0.012** | 0.365 | 0.186 |
| S11 | Aimi b | 0.405 | 76.9 ± 8.0 | 82.8 ± 2.9 | 25.11 ± 3.64 | 17.56 ± 1.73* | 11.17 ± 0.39 | 7.82 ± 0.50** | 0.448 ± 0.027 | 0.450 ± 0.050 | 0.950 | 1.571 |
| S12 | Zhonghan-3a | 0.435 | 79.3 ± 1.9 | 67.8 ± 4.9 | 19.78 ± 1.01 | 8.50 ± 0.63** | 9.49 ± 0.47 | 2.45 ± 0.12*** | 0.289 ± 0.015 | 0.480 ± 0.024*** | 0.283 | 0.181 |
| S14 | Yunlua | 0.509 | 73.2 ± 2.3 | 81.7 ± 2.5 | 19.70 ± 2.73 | 11.34 ± 0.62** | 7.41 ± 0.50 | 3.31 ± 0.15*** | 0.292 ± 0.005 | 0.378 ± 0.022* | 0.505 | 0.425 |
| S17 | Qingsizhan b | 0.416 | 88.5 ± 1.8 | 47.8 ± 3.6** | 20.79 ± 0.79 | 13.69 ± 1.60* | 10.49 ± 0.65 | 2.05 ± 0.20*** | 0.151 ± 0.023 | 0.504 ± 0.022*** | 0.698 | 0.115 |
| S18 | IRAT109 a | 0.468 | 77.2 ± 6.9 | 52.8 ± 13.0 | 16.45 ± 2.30 | 7.90 ± 1.00* | 8.56 ± 1.45 | 1.84 ± 0.49* | 0.252 ± 0.169 | 0.517 ± 0.059** | 0.293 | 0.113 |
| S24 | IPECA0162 a | 0.366 | 87.7 ± 2.8 | 54.5 ± 14.8 | 14.20 ± 0.27 | 6.93 ± 0.64*** | 7.26 ± 0.34 | 1.51 ± 0.50** | 0.235 ± 0.166 | 0.511 ± 0.034** | 0.261 | 0.090 |
| S26 | Bulebelle a | 0.435 | 70.9 ± 0.5 | 60.7 ± 4.9 | 18.17 ± 1.10 | 10.21 ± 0.91* | 9.27 ± 0.74 | 4.26 ± 0.67** | 0.413 ± 0.050 | 0.509 ± 0.018 | 0.444 | 0.563 |
| S28 | Tresmes b | 0.441 | 84.0 ± 2.7 | 64.3 ± 14.4 | 29.88 ± 0.26 | 18.75 ± 2.60* | 13.30 ± 0.33 | 4.76 ± 0.96** | 0.270 ± 0.137 | 0.445 ± 0.015* | 0.911 | 0.488 |
| S31 | Huhan-1B b | 0.384 | 74.6 ± 0.7 | 43.8 ± 2.2*** | 26.14 ± 1.49 | 13.32 ± 0.96** | 11.76 ± 0.44 | 2.71 ± 0.20*** | 0.204 ± 0.007 | 0.451 ± 0.029** | 0.525 | 0.179 |
a indicates susceptible genotype
b indicates tolerant genotype