Table 1.
Post imbibitional salinity stress (PISS) induced changes in endogenous titer of some impotant redox sensitive phenolic acids and flavonoids along with the total pool of phenolics and flavonoids in two indica rice cultivars differing in sensitivity towards NaCl salinity stress (Oryza sativa L. Cultivars Patnai & IR29)
| Rice cultivars | Treatment | Total phenol (µg g−1dm) | Accumulation of redox sensitive phenolic acids (mg/100 g dm) | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Gallic acid | Protocatechuic acid | Gentisic acid | p OH benzoic acid | Chlorogenic acid | Caffeic acid | Syringic acid | Salicylic acid | Cinnamic acidc a | Ellagic acid | |||
| Oryza sativa L. Cultivar Patnai | Untreated control | 389.4 ± .08 | 31.654 | 0.16727 | 24.527 | 1.709 | _ | 0.5818 | 0.8909 | 3.0363 | 2.5270 | 0.1818 |
| PISS (250 mM NaCl) |
477.87 ± .25** (+22.72%) |
30.2726 (-4.36%) |
0.01818 (-8.68%) |
480.872 (+1860%) |
2.7363 (+60%) |
_ |
0.72727 (+25%) |
1.0545 (+18.36%) |
5.09 (+67.66%) |
3.6727 (+45.33%) |
0.2695 (+48.23%) |
|
| Oryza sativa L. Cultivar IR29 | Untreated control | 366.6 ± .15 | 31.36 | 3.381 | 173.5 | 2.818 | 284 | 0.509 | 1.054 | 5.745 | 105.9 | 20.98 |
| PISS (250 mM NaCl) |
390.42 ± .26** (+6.49%) |
45.4 (+44%) |
1.32 (-60.9%) |
107.7 (-37%) |
6.52 (+131%) |
267 (7%) |
1.928 (+278%) |
1.236 (+17.26%) |
5.527 (-3.79%) |
128.10 (+20%) |
– | |
| Rice cultivars | Treatment | Total flavonoids (µg g−1dm) | Accumulation of redox sensitive flavonoids (mg/100 g dm) | |||||
|---|---|---|---|---|---|---|---|---|
| Catechin | Naringin | Rutin | Myricetin | Quercetin | Kaempferol | |||
| Oryza sativa L. Cultivar Patnai | Untreated control | 384.075 ± .016 | 45.1 | 635.8 | 258.4 | 93.8 | 311.3 | 47.4 |
| PISS (250 mM NaCl) |
334.6 ± .017** (-13.06%) |
80.8 (+79%) |
1067.6 (+67%) |
598.7 (+131%) |
26.4 (-71%) |
806.9 (+159%) |
7.3 (-84%) |
|
| Oryza sativa L. Cultivar IR29 | Untreated control | 292.4 ± .32 | 57 | 331.9 | 52.6 | 123.5 | 535.2 | 8.8 |
| PISS (250 mM NaCl) |
113.85 ± .18** (-61%) |
117.6 (+106%) |
355.6 (+7.14%) |
75.77 (+44%) |
19.3 (-84%) |
270.7 (-49.4%) |
8.4 (-4.5%) |
|
Values are mean of three independent replicates ± standard error. * or ** represent the values which are significantly different at 0.01, 0.05 levels respectively, assessed through student t test. Values with in parenthesis represents % increment or reduction under PISS over control