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1

Alterations in root lipid peroxidation and antioxidative responses in two rice cultivars under NaCl-salinity stress

100%
Khan M. H., Panda S. K.
Acta Physiologiae Plantarum
|
2008
|
tom 30
|
nr 1
The comparative alterations of short term NaCl stress and recovery on growth, water relations, ionic composition, lipid peroxidation and antioxidants in roots of two rice cultivars differing in salt tolerance were studied. Exposed for 24 h to increasing (50, 100 and 150 mmol l1) concentrations of NaCl, roots of 12D Oryza sativa L. cv. Lunishree and cv. Begunbitchi decreased in fresh weight, dry weight and relative water content. Increased Na+ and decreased K+ ion were determined at increasing NaCl concentrations. Both peroxide content and lipid peroxidation measured in terms of MDA level increased and the ratio was higher in Begunbitchi compared to Lunishree. Recovered roots showed lower peroxide and MDA content. Ascorbate and glutathione contents increased in the stressed and recovered roots of Lunishree, but decreased in Begunbitchi with increasing NaCl concentrations. Although SOD, CAT and GR activities decreased in the stressed roots, CAT activity also increased in recovered roots of both the cultivars. The POX activity increased in stressed and recovered roots of both Lunishree and Begunbitchi. Higher free radicals scavenging capacity and more efficient protection mechanism of Lunishree against salt stress, as revealed by the lower level of lipid peroxidation and improved plant water status as well as activities of some of the antioxidants, suggest that significant cultivar differences in response to salt stress in rice are closely related to differences in the activities of antioxidants and ion content. Another possible conclusion is that improved tolerance to salt stress may be accomplished by increased capacity of antioxidative system.
2

Effect of salicylic acid potentiates cadmium-induced oxidative damage in Oryza sativa L. leaves

100%
Panda S. K., Patra H. K.
Acta Physiologiae Plantarum
|
2007
|
tom 29
|
nr 6
In the present investigation, we studied the possible potentiating effect of salicylic acid (SA) under Cd toxicity in Oryza sativa L. leaves. Cd treatments for 24 h reduced the shoot length, dry biomass and total chlorophyll content followed by high Cd accumulation in shoots. About 16 h presoaking with SA resulted in partial protection against Cd, as observed by minor changes in length, biomass and total chlorophyll. SA priming resulted in low Cd accumulation. Enhanced thiobarbituric acid reactive substances (TBARS), hydrogen peroxide (H₂O₂) and superoxide anion (O₂⁻) content were seen when Cd was applied alone, while under SA priming the extent of TBARS, H₂O₂ and O₂⁻ were significantly low, suggesting SA-regulated protection against oxidative stress. The antioxidant enzymes like Catalase (CAT), guaiacol peroxidase (GPx), glutathione reductase (GR) and superoxide dismutase (SOD) showed varied activities under Cd alone. CAT activity increased after Cd treatment, followed by a decline in GPX and GR activity. SOD also declined at the highest concentrations with an initial increase. Under SA-priming conditions, the efficiency of the antioxidant enzymes was significantly elevated. GPx and SOD activity showed significant increase in activity. The ascorbate activity increased after Cd treatment, followed by a decline in glutathione under SA-free condition. SA priming showed gradual increase in these non-enzymic antioxidants. Our results indicate that Cd-induced oxidative stress can be regulated by SA.
3

Variation of physiological and antioxidative responses in tea cultivars subjected to elevated water stress followed by rehydration recovery

81%
Upadhyaya H., Panda S. K., Dutta B. K.
Acta Physiologiae Plantarum
|
2008
|
tom 30
|
nr 4
Water stress is a major limitation for plant survival and growth. Several physiological and antioxidative mechanisms are involved in the adaptation to water stress by plants. In this experiment, tea cultivars (TV-1, TV-20, TV-29 and TV-30) were subjected to drought stress by withholding water for 20 days followed by rehydration. An experiment was thus performed to test and compare the effect of dehydration and rehydration in growing seedlings of tea cultivars. The effect of drought stress and post stress rehydration was measured by studying the reactive oxygen species (ROS) metabolism in tea. Water stress decreased nonenzymic antioxidants like ascorbate and glutathione contents with differential responses of enzymic antioxidants in selected clones of Camellia sinensis indicating an oxidative stress situation. This was also apparent from increased lipid peroxidation, O2⁻ and H2O2 content in water stress imposed plants. But the oxidative damage was not permanent as the plants recovered after rehydration. Comparatively less decrease in antioxidants, higher activities of POX, GR, CAT with higher phenolic contents suggested better drought tolerance of TV-1, which was also visible from the recovery study, where it showed lower ROS level and higher recovery of antioxidant property in response to rehydration, thus proving its better recovery potential. On the other hand, highest H2O2 and lipid peroxidation with decrease in phenolic content during stress in TV-29 suggested its sensitivity to drought. The antioxidant efficiency and biochemical tolerance in response to drought stress thus observed in the tested clones of Camellia sinensis can be arranged in the order as TV-30>TV-1>TV-29>TV-20.
4

Changes in antioxidant levels in Oryza sativa L. roots subjected to NaCl-salinity stress

80%
Khan M. H., Singha K. L. B., Panda S. K.
Acta Physiologiae Plantarum
|
2002
|
tom 24
|
nr 2
5

Cadmium stress-induced oxidative stress and role of nitric oxide in rice (Oryza sativa L.)

71%
Panda P., Nath S., Chanu T. T., Sharma G. D., Panda S. K.
Acta Physiologiae Plantarum
|
2011
|
tom 33
|
nr 5
Cadmium (Cd) is a potential environmental phytotoxicant. The generation of reactive oxygen species (ROS) due to Cd stress is responsible for the induction of oxidative stress in plants. On the other hand, SNP, a NO donor is known to have effect on Cd-induced oxidative stress in plants. We evaluated the effect of NO on the regulation of Cd stress in the rice (Oryza sativa L.) variety MSE-9. Cd treatment was given in the form of 50, 100 and 200 µM, whereas for interaction study, 100 µM of Cd and 100 µM of SNP were used. The result showed that Cd-induced oxidative stress in MSE-9 by generating ROS. However, when SNP was given with Cd stress, it was seen that SNP treatment regulated the stress metabolism in rice seedlings under Cd toxicity by generating NO. It can be said that the SNP in combination with Cd treatment might possess the way to protect rice seedlings under Cd stress.
6

Differential oxidative stress responses in Brassica juncea (L.) Czern and Coss cultivars induced by cadmium at germination and early seedling stage

71%
Chowardhara B., Borgohain P., Saha B., Awasthi J. P., Panda S. K.
Acta Physiologiae Plantarum
|
2020
|
tom 42
|
nr 07
7

Physiological introspection into differential drought tolerance in rice cultivars of North East India

51%
Sahoo S., Saha B., Awasthi J. P., Omisun T., Borgohain P., Hussain S., Panigrahi J., Panda S. K.
Acta Physiologiae Plantarum
|
2019
|
tom 41
|
nr 04
Drought is a vice to world crop production, exponentially enhanced by global climate change. Rice, a basic food crop for a major chunk of world populace, is largely affected by environmental challenges such as drought, salinity and heavy metal. This study brings to limelight differential drought tolerance capacity of rice varieties indigenous to North East India, a hot bed of indica rice diversity. Initial screening of rice varieties were performed through physiological dose-dependent studies under PEG (0%, 10%, and 20% which is equal to osmotic potential values of 0.001, 0.54 and 1.09 MPa, respectively), induced drought stress for three time intervals of 1, 3 and 5 days. Hierarchical clustering of the parameters on which the cultivars were analysed revealed Tampha and KMJ 1-12-3 to be relatively more tolerant whereas Chandan and Ketaki Joha as the sensitive ones. Biochemical studies for hydrogen peroxide (H₂O₂), proline, lipid peroxidation (MDA), lipoxygenase (LOX), superoxide dismutase (SOD), catalase (CAT), guaiacol peroxidase (POX), dehydroascorbate reductase (DHAR), monodehydroascorbate reductase (MDHAR) and glutathione reductase (GR) were then performed on two cultivars (Tampha and Chandan) to elucidate the differential tolerance to drought, focusing on anti-oxidative response mechanism. The biochemical fingerprint showed significantly lower accumulation of H₂O₂ and MDA; higher accumulation of proline; and higher activity of SOD, CAT, DHAR, MDHAR and GR in the tolerant variety Tampha when compared to Chandan. In addition, alteration of chlorophyll fluorescence due to stress was also monitored to ascertain the variation in photosynthetic efficiency between the tolerant and sensitive cultivars. Tampha showed better photosynthetic activity in comparison to Chandan as quantified by measuring chlorophyll fluorescence. This manuscript thus throws new light into the drought stress response of the varieties from North East India with global implications.
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