Antioxidant Response to NaCl Stress in Salt‐Tolerant and Salt‐Sensitive Cultivars of Cotton

Gossett, D. R.; Millhollon, E. P.; Lucas, Mariana

doi:10.2135/cropsci1994.0011183x003400030020x

Cited by 644 publications

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“…Feierabend et al (1992) have shown that under stress conditions inactivation of CAT is linked to H 2 O 2 accumulation. Loss of CAT activity due to salt stress in cotton (Gossett et al, 1994), sunflower (Santos et al, 2001), and rice (Lee et al, 2001), as well as due to photo-oxidative stress in tobacco chloroplasts (Miyagawa et al, 2000), is consistent with our results for J. curcas. The inhibition of CAT and APX activities by salt stress may be a consequence of downregulated gene expression or degradation, denaturation and/or inhibition/ inactivation of these proteins (Feierabend et al, 1992;Lee et al, 2001).…”

Section: Discussionsupporting

confidence: 92%

Photosynthesis and antioxidant activity in Jatropha curcas L. under salt stress

Campos

Hsie

Granja

et al. 2012

Braz. J. Plant Physiol.

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Biodiesel is an alternative to petroleum diesel fuel. It is a renewable, biodegradable, and nontoxic biofuel. Interest in the production of biodiesel from Jatropha curcas L. seeds has increased in recent years, but the ability of J. curcas to grow in salt-prone areas, such as the Caatinga semiarid region, has received considerably meager attention. The aim of this study was to identify the main physiological processes that can elucidate the pattern of responses of J. curcas irrigated with saline water, which commonly occurs in the semiarid Caatinga region. This study measured the activity of the antioxidant enzymes involved in the scavenging of reactive oxygen species, which include catalase (CAT) and ascorbate peroxidase (APX), as well as malondialdehyde (MDA) levels. The levels of chlorophyll (Chl), carotenoids, amino acids, proline, and soluble proteins were also analyzed. The net carbon assimilation rate (P N ), stomata conductance (g s ), and transpiration rate (E) decreased with salt stress. The activities of CAT and APX were decreased, while H 2 O 2 and MDA levels as well as electrolyte leakage were significantly increased in salt-stressed plants compared to the untreated ones. These observations suggest that the ability of J. curcas plants resist to salt stress is associated with the activities of protective enzymes and their defensive functions. However, our results indicate that the reactive oxygen species scavenging system is not sufficient to protect J. curcas leaves against oxidative damage caused by salt stress, and, therefore, it cannot be treated as a salt tolerant plant species.

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Section: Discussionsupporting

confidence: 92%

Photosynthesis and antioxidant activity in Jatropha curcas L. under salt stress

Campos

Hsie

Granja

et al. 2012

Braz. J. Plant Physiol.

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“…The ratios of AsA to DAsA and of GSH to GSSG decrease under oxidative stress (Law et al, 1983;Gossett et al, 1994). Although the ratios of both AsA/DAsA and GSH/GSSG were lower in Al-treated than in control leaves, AsA and GSH still accounted for more than 90 % of the total glutathione pool and ascorbate pool in the Al-treated leaves (Fig.…”

Section: Discussionmentioning

confidence: 91%

Effects of Aluminum on Light Energy Utilization and Photoprotective Systems in Citrus Leaves

Chen

Qi²,

Liu³

2005

Annals of Botany

105

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Background and Aims Under high photon flux, excitation energy may be in excess in aluminum (Al)-treated leaves, which use a smaller fraction of the absorbed light in electron transport due to decreased CO 2 assimilation compared with normal leaves. The objectives of this study were to test the hypothesis that the antioxidant systems are up-regulated in Al-treated citrus leaves and correlate with protection from photoxidative damage, and to test whether xanthophyll cycle-dependent thermal energy dissipation is involved in dissipating excess excitation energy.Methods 'Cleopatra' tangerine seedlings were fertilized and irrigated daily for 8 weeks with quarter-strength Hoagland's nutrient solution containing Al at a concentration of 0 or 2 mM from Al 2 (SO 4 ) 3 .18H 2 O. Thereafter, leaf absorptance, chlorophyll (Chl) fluorescence, Al, pigments, antioxidant enzymes and metabolites were measured on fully expanded leaves.Key Results Compared with control leaves, energy was in excess in Al-treated leaves, which had smaller thermal energy dissipation, indicated by non-photochemical quenching (NPQ). In contrast, conversion of violaxanthin (V) to antheraxanthin (A) and zeaxanthin (Z) at midday increased in both treatments, but especially in Al-treated leaves, although A + Z accounted for less 40 % of the total xanthophyll cycle pool in them. Activities of superoxide dismutase (SOD), ascorbate peroxidase (APX), monodehydroascorbate reductase (MDAR), dehydroascorbate reductase (DHAR), glutathione reductase (GR) and catalase (CAT), and concentrations of ascorbate (AsA), dehydroascorbate (DASA), reduced glutathione (GSH) and oxidized glutathione (GSSG) were higher in Al-treated than in control leaves.Conclusions These results corroborate the hypothesis that, compared with control leaves, antioxidant systems are up-regulated in Al-treated citrus leaves and protect from photoxidative damage, whereas thermal energy dissipation was decreased. Thus, antioxidant systems are more important than thermal energy dissipation in dissipating excess excitation energy in Al-treated citrus leaves.

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“…The higher SOD activity in RH30 resulted in a greater level of H 2 O 2 , and therefore caused higher cellular damage in RH30 than Alankar. Gossett et al 45 reported that higher SOD activity without complementary increase in the ability to scavenge the formed H 2 O 2 can result in the increased cellular damage. Further, higher increase of CAT, APX and GR activity in Alankar resulted in efficient scavenging of Cd-induced ROS than RH30, where the activity of these enzymes was either less or reduced in comparison to the control.…”

Section: Resultsmentioning

confidence: 99%

Differential cadmium stress tolerance in five Indian mustard (Brassica junceaL.) cultivars

Gill

Khan

Tuteja

2011

Plant Signaling & Behavior

144

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IntroductionAgricultural soils worldwide are slightly to moderately contaminated with toxic heavy metals that restrict the crop plants to reach their full genetic potential and cause significant loss by reducing the crop productivity. 1 Among heavy metals, Cd is a non-essential and most deleterious heavy metal pollutant commonly released into the arable soil from various industrial, mining and farming practices, 2 and has been ranked No. 7 among the top 20 toxins which affect the human health by entering in the food chain. 3,4 Although Cd is a highly phytotoxic metal, it is easily taken up by plant roots growing on Cd-contaminated soils and transported to above ground plant parts. 5-7 The regulatory limit of Cd in agricultural soils is 100 mg Cd kg -1 soil, 8 but this threshold is continuously increasing because of anthropogenic and industrial activities. Plants growing on Cd contaminated soil result in Cd accumulation in all plant parts, which inhibits plant growth, affect nutrient uptake, alters the chloroplast ultrastructure, inactivates enzymes of CO 2 fixation, inhibits photosynthesis and induces lipid peroxidation and antioxidant machinery. 4,[9][10][11] However, Cd is a non redox-active metal, but it induces the generation of reactive oxygen species (ROS) including superoxide radical (O 2•-), hydrogen peroxide (H 2 O 2 ) and hydroxyl radicalThe presence of cadmium (cd) in the agricultural soils affects horticultural cultivars and constrains the crop productivity. a pot experiment was performed using five cultivars of mustard (Brassica juncea L.) to evaluate the difference in their response to cd toxicity under greenhouse conditions. The pots containing reconstituted soil were supplied with different concentration of cdcl 2 (0, 25, 50, 100 or 150 mg cd kg -1 soil). Increasing concentration of cd in the soil resulted in decreased growth, photosynthesis and yield. Maximum significant reduction in growth, photosynthesis and yield were observed with 150 mg cd kg -1 soil in all the cultivars. Our results indicate that the cultivar alankar is found to be more tolerant to cd stress, recording higher plant dry mass, net photosynthesis rate, associated with high antioxidant activity and low cd content in the plant leaves and thus less oxidative damage. cultivar rh30 experienced maximum damage in terms of reduction in growth, photosynthesis, yield characteristics and oxidative damage and emerged as sensitive cultivar. The data of tolerance index of alankar were found to be higher among all tested mustard cultivars which indicate its higher tolerance to cd. Better coordination of antioxidants protected alankar from cd toxicity, whereas lesser antioxidant activity in rh30 resulted in maximum damage. cultivars of mustard were ranked with respect to their tolerance to cd: alankar > Varuna > Pusa Bold > Sakha > rh30, respectively.Differential cadmium stress tolerance in five indian mustard (Brassica juncea L.) cultivars

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Antioxidant Response to NaCl Stress in Salt‐Tolerant and Salt‐Sensitive Cultivars of Cotton

Cited by 644 publications

References 0 publications

Photosynthesis and antioxidant activity in Jatropha curcas L. under salt stress

Photosynthesis and antioxidant activity in Jatropha curcas L. under salt stress

Effects of Aluminum on Light Energy Utilization and Photoprotective Systems in Citrus Leaves

Differential cadmium stress tolerance in five Indian mustard (Brassica junceaL.) cultivars

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