Table 2.
Effect of drought and heat stresses on maize yield and related characteristics.
| Maize cultivars | Treatments | Ears/plant | Kernel rows/ear | Kernels/ear | 100-kernel weight(g) | Grain yield/plant(g) | HI |
|---|---|---|---|---|---|---|---|
| Xida 319 | Ck | 2.02 ± 0.09 | 14.32 ± 0.36 | 281.33 ± 9.26 | 22.97 ± 0.37 | 107.33 ± 4.98 | 0.30 ± 0.01 |
| H | 1.93 ± 0.05 | 13.89 ± 0.23 | 248.70 ± 6.67* | 22.20 ± 0.44 | 89.50 ± 5.07* | 0.25 ± 0.01* | |
| D | 1.87 ± 0.11 | 13.95 ± 0.54 | 237.67 ± 11.35** | 21.97 ± 0.90 | 85.20 ± 7.16* | 0.24 ± 0.01* | |
| H + D | 1.82 ± 0.06 | 13.51 ± 0.51 | 202.67 ± 3.71** | 18.67 ± 0.33** | 72.70 ± 2.76** | 0.20 ± 0.02** | |
| Means | 1.91 | 13.92 | 242.59 | 21.45 | 88.69 | 0.25 | |
| Xida 889 | Ck | 2.11 ± 0.05 | 14.86 ± 0.55 | 308.00 ± 9.02 | 23.93 ± 0.62 | 117.07 ± 5.53 | 0.33 ± 0.03 |
| H | 1.94 ± 0.06 | 14.05 ± 0.53 | 266.00 ± 4.16* | 22.63 ± 1.16 | 100.03 ± 3.18* | 0.28 ± 0.01 | |
| D | 1.94 ± 0.03 | 13.67 ± 0.64 | 261.70 ± 4.44* | 21.50 ± 0.76 | 96.10 ± 4.80* | 0.26 ± 0.02* | |
| H + D | 1.96 ± 0.05 | 13.97 ± 0.09 | 221.43 ± 15.50** | 20.02 ± 0.58* | 90.97 ± 4.98** | 0.23 ± 0.01* | |
| Means | 1.99 | 14.14 | 264.28 | 22.02 | 101.04 | 0.27 |
Values are means of three replicates ±SE. For Duncan’s results, means with asterisks are considered as significant different compared with control. *P ≤ 0.05; **P ≤ 0.01.
Ck, control; H, heat stress; D, drought stress and H + D, heat + drought stress.