TABLE 4.
Impact of plant growth regulators on hormones content in rice root 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 | 421.3 | 458.4 | 574.8 | 696.6 | 1.38 | 1.73 | 0.62 | 0.85 | 348.4 | 371.5 | 115.2 | 156.8 | 68.0 | 90.5 | 41.4 | 62.9 | 10.2 | 16.7 | |
| Br + MeJA + Tr | 429.2 | 465.6 | 570.2 | 690.6 | 1.32 | 1.72 | 0.60 | 0.85 | 346.0 | 368.6 | 109.4 | 150.3 | 72.0 | 94.0 | 38.5 | 60.9 | 7.2 | 15.0 | ||
| Ve + Vc | 442.4 | 472.5 | 565.9 | 683.2 | 1.13 | 1.65 | 0.58 | 0.82 | 341.9 | 365.7 | 101.1 | 145.2 | 76.3 | 97.1 | 35.1 | 57.8 | 5.3 | 13.3 | ||
| MeJA | 450.3 | 477.7 | 557.4 | 676.8 | 1.12 | 1.61 | 0.56 | 0.80 | 338.3 | 362.6 | 94.6 | 141.7 | 79.8 | 100.3 | 32.0 | 55.3 | 3.4 | 11.4 | ||
| AC | 455.7 | 482.3 | 552.8 | 670.4 | 1.11 | 1.58 | 0.56 | 0.79 | 335.4 | 359.6 | 90.5 | 138.7 | 75.5 | 103.0 | 29.4 | 53.2 | 2.3 | 10.1 | ||
| HDT | Vc + Br + MeJA Ve | 414.1 | 452.2 | 594.2 | 707.2 | 1.50 | 1.79 | 0.69 | 0.88 | 353.2 | 375.9 | 125.2 | 167.4 | 57.4 | 86.6 | 49.5 | 68.6 | 12.4 | 18.9 | |
| Br + MeJA + Tr | 421.2 | 458.1 | 588.1 | 701.1 | 1.43 | 1.77 | 0.66 | 0.87 | 350.1 | 373.2 | 120.4 | 161.4 | 61.3 | 89.8 | 47.7 | 66.6 | 11.0 | 16.9 | ||
| Ve + Vc | 430.5 | 466.0 | 580.8 | 691.2 | 1.38 | 1.76 | 0.64 | 0.85 | 347.5 | 369.9 | 112.5 | 156.1 | 66.5 | 93.7 | 44.2 | 63.2 | 8.6 | 15.2 | ||
| MeJA | 437.5 | 471.7 | 573.8 | 685.0 | 1.27 | 1.74 | 0.60 | 0.83 | 343.9 | 366.7 | 106.1 | 151.1 | 70.2 | 96.1 | 40.8 | 60.0 | 7.4 | 13.5 | ||
| AC | 445.2 | 476.5 | 569.0 | 678.7 | 1.25 | 1.73 | 0.59 | 0.81 | 341.2 | 364.8 | 102.1 | 147.5 | 66.4 | 98.3 | 38.3 | 58.3 | 6.1 | 12.2 | ||
| AT | Vc + Br + MeJA Ve | 405.1 | 445.6 | 609.6 | 713.0 | 1.61 | 1.95 | 0.75 | 0.98 | 362.2 | 379.5 | 134.8 | 172.7 | 51.4 | 83.0 | 54.2 | 70.5 | 17.2 | 20.8 | |
| Br + MeJA + Tr | 410.5 | 452.6 | 607.2 | 708.3 | 1.60 | 1.95 | 0.75 | 0.94 | 360.0 | 377.8 | 131.9 | 168.1 | 53.3 | 84.7 | 52.4 | 68.6 | 15.9 | 19.2 | ||
| Ve + Vc | 419.5 | 459.2 | 604.3 | 705.2 | 1.56 | 1.94 | 0.70 | 0.90 | 357.6 | 375.1 | 128.2 | 164.3 | 55.8 | 86.7 | 50.9 | 66.7 | 14.2 | 17.3 | ||
| MeJA | 425.9 | 464.0 | 600.3 | 700.2 | 1.51 | 1.93 | 0.67 | 0.87 | 354.4 | 372.7 | 124.1 | 159.6 | 58.7 | 90.1 | 49.2 | 64.8 | 12.4 | 15.9 | ||
| AC | 429.1 | 468.2 | 596.4 | 693.6 | 1.50 | 1.90 | 0.65 | 0.85 | 352.3 | 371.3 | 116.6 | 154.5 | 60.6 | 92.9 | 47.4 | 62.8 | 10.8 | 14.3 | ||
| Temperature | ** | ** | ** | * | ** | ** | * | * | * | ** | ** | ** | ** | ** | ** | ** | ** | * | ||
| PGR | * | * | * | * | * | * | * | * | * | * | * | ** | ** | * | * | * | * | * | ||
| Temperature × PGR | NS | NS | NS | NS | NS | NS | NS | NS | NS | NS | NS | NS | NS | NS | NS | NS | NS | NS | ||
| CV | 9.3 | 8.8 | 10.3 | 11.3 | 7.9 | 6.7 | 9.4 | 13.3 | 8.4 | 10.3 | 10.5 | 14.5 | 9.5 | 10.7 | 9.5 | 9.9 | 11.8 | 12.1 | ||
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.