TABLE 3.
Impact of plant growth regulators on hormones content in rice leaves under heat stress at heading stage.
| Tem | PGR | TZ9G |
ZR |
DIHZR |
DIZ |
Z |
IPMP |
IP9G |
IPA |
IP |
|||||||||
| (ng g–1) | |||||||||||||||||||
| IR-64 | HHZ | IR-64 | HHZ | IR-64 | HHZ | IR-64 | HHZ | IR-64 | HHZ | IR-64 | HHZ | IR-64 | HHZ | IR-64 | HHZ | IR-64 | HHZ | ||
| HNT | Vc + Br + MeJA Ve | 379.3 | 413.9 | 419.3 | 536.9 | 1.08 | 1.32 | 0.40 | 0.56 | 237.1 | 255.3 | 115.0 | 144.8 | 93.8 | 111.8 | 56.4 | 79.6 | 23.7 | 29.7 |
| Br + MeJA + Tr | 387.2 | 421.1 | 416.0 | 530.8 | 1.03 | 1.31 | 0.39 | 0.55 | 234.8 | 252.3 | 105.7 | 138.6 | 98.0 | 115.2 | 53.5 | 77.6 | 20.7 | 28.0 | |
| Ve + Vc | 400.4 | 428.0 | 409.4 | 523.5 | 0.84 | 1.23 | 0.37 | 0.53 | 230.7 | 249.4 | 94.8 | 135.6 | 102.6 | 118.4 | 50.1 | 74.5 | 19.6 | 26.3 | |
| MeJA | 408.3 | 433.2 | 400.1 | 517.0 | 0.83 | 1.20 | 0.35 | 0.51 | 227.1 | 246.3 | 83.6 | 130.5 | 106.0 | 121.6 | 47.0 | 72.0 | 18.6 | 24.4 | |
| AC | 413.7 | 437.8 | 394.8 | 510.7 | 0.82 | 1.17 | 0.35 | 0.50 | 224.2 | 243.4 | 78.5 | 127.4 | 108.8 | 124.2 | 44.4 | 70.0 | 18.2 | 23.1 | |
| HDT | Vc + Br + MeJA Ve | 372.1 | 407.7 | 436.4 | 547.5 | 1.21 | 1.38 | 0.48 | 0.58 | 242.0 | 259.6 | 118.8 | 160.3 | 83.6 | 107.8 | 64.5 | 85.3 | 25.9 | 31.9 |
| Br + MeJA + Tr | 379.2 | 413.6 | 430.4 | 541.3 | 1.13 | 1.36 | 0.45 | 0.57 | 238.8 | 257.0 | 115.5 | 153.2 | 86.7 | 111.1 | 62.7 | 83.4 | 24.5 | 29.9 | |
| Ve + Vc | 388.5 | 421.5 | 423.8 | 531.4 | 1.08 | 1.34 | 0.42 | 0.56 | 236.3 | 253.7 | 105.7 | 147.3 | 92.5 | 114.9 | 59.2 | 80.0 | 22.1 | 28.2 | |
| MeJA | 395.5 | 427.2 | 415.3 | 525.2 | 0.98 | 1.33 | 0.39 | 0.53 | 232.6 | 250.5 | 98.4 | 138.2 | 96.4 | 117.4 | 56.6 | 76.8 | 21.0 | 26.5 | |
| AC | 403.2 | 432.0 | 410.0 | 519.0 | 0.96 | 1.32 | 0.38 | 0.52 | 230.0 | 248.6 | 92.4 | 135.1 | 99.9 | 119.6 | 54.1 | 75.0 | 20.0 | 25.2 | |
| AT | Vc + Br + MeJA Ve | 363.1 | 401.1 | 453.1 | 553.2 | 1.31 | 1.54 | 0.54 | 0.69 | 251.0 | 263.3 | 134.4 | 163.0 | 77.4 | 104.2 | 69.2 | 87.2 | 30.2 | 33.8 |
| Br + MeJA + Tr | 368.5 | 408.1 | 450.7 | 548.6 | 1.31 | 1.54 | 0.54 | 0.64 | 248.7 | 261.5 | 130.2 | 158.5 | 80.0 | 105.9 | 67.4 | 85.4 | 28.9 | 32.2 | |
| Ve + Vc | 377.5 | 414.7 | 447.8 | 545.4 | 1.27 | 1.53 | 0.48 | 0.60 | 246.3 | 258.9 | 127.3 | 153.8 | 82.1 | 108.0 | 65.9 | 83.4 | 27.2 | 30.3 | |
| MeJA | 383.9 | 419.5 | 443.8 | 540.5 | 1.22 | 1.52 | 0.46 | 0.58 | 243.1 | 256.4 | 124.1 | 148.3 | 85.2 | 111.4 | 64.2 | 81.6 | 25.4 | 28.9 | |
| AC | 387.1 | 423.7 | 439.9 | 533.9 | 1.21 | 1.49 | 0.43 | 0.56 | 241.0 | 255.0 | 117.1 | 141.2 | 87.6 | 114.1 | 61.9 | 79.5 | 23.8 | 27.3 | |
| Temperature | * | ** | ** | * | ** | ** | ** | ** | * | * | ** | ** | ** | ** | ** | ** | ** | ** | |
| PGR | * | * | * | * | * | ** | * | * | ns | ns | * | * | * | * | ** | * | * | * | |
| Temperature × PGR | ns | ns | ns | ns | ns | ns | ns | ns | ns | ns | ns | ns | ns | ns | ns | ns | ns | ns | |
| CV | 4.5 | 5.3 | 9.8 | 10.4 | 11.5 | 9.2 | 10.9 | 12.4 | 12.4 | 10.8 | 9.4 | 8.3 | 9.5 | 8.6 | 12.3 | 9.7 | 13.3 | 10.3 | |
PGR; CV; HHZ; IR-64; NS; ** and *; IP9G; Z; TZ9G; TZ9G; DIZ; ZR; IPA; DIHZR; IP; IPMP; HDT; HNT and AT stand for plant growth regulators; coefficient of variation; heat tolerant (HZZ); heat susceptible (IR-64); non-significant; significantly different at α = 0.01 and 0.05, Isopentenyl adenine 9-glucoside, Zeatin, Trans-zeatin 9-glucoside, Dihydrozeatin, Zeatin riboside, Isopentinyl adenosine, Dihydrozeatin riboside, Isopentenyl adenine, Isopentenyl adenosine 5’-monophosphate, high day; high night, and ambient temperature, correspondingly. Vc; MeJA; Ve; Tr; Br, and AC represent vitamin C, methyl jasmonates, vitamin E, triazoles; brassinosteroids and control applied at the rate of 1.4, 1.8, 6.9, 0.55, 4.0, and 0 mg L–1, respectively.