Responses of Wheat Seedlings to Exogenous Selenium Supply Under Cold Stress

Chu, Jianzhou; Yao, Xiaogang; Zhang, Zhuona

doi:10.1007/s12011-009-8542-3

Cited by 162 publications

(75 citation statements)

References 28 publications

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“…These findings are similar to those of Yao et al [37] who did not find any change in MDA content at 1 mg Se/ kg, while 2 mg/kg reduced the level of superoxides and MDA content in wheat seedlings. Chu et al [46] also found reduction in MDA content with 1 mg Se in wheat seedlings subjected to cold stress. Our findings on elevation of MDA content at higher Se levels are in accordance with effects of some other metals causing a similar increase [47].…”

Section: Se Effectsmentioning

confidence: 88%

Exogenous Proline Application Reduces Phytotoxic Effects of Selenium by Minimising Oxidative stress and Improves Growth in Bean (Phaseolus vulgaris L.) Seedlings

Aggarwal

Sharma

Kaur

et al. 2010

Biol Trace Elem Res

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Bean (Phaseolus vulgaris L.) seedlings were subjected to varying selenium levels (1, 2, 4, and 6 ppm) in a hydroponic culture. The germination reached 100% in 48 h in all Se levels except 6 ppm, where it took 72 h. The root and shoot growth was stimulated at 1 and 2 ppm Se levels that was commensurate with increase in chlorophyll content, leaf water content, and cellular respiration. At 4 and 6 ppm Se levels, the growth was inhibited appreciably, which was associated with increase in stress injury measured as damage to membranes and decrease in cellular respiration, chlorophyll, and leaf water content. The oxidative injury as elevation of lipid peroxidation was larger compared to hydrogen peroxide accompanied by reduced levels of enzymatic (superoxide dismutase, catalase, ascorbate peroxidase, and glutathione reductase) and non-enzymatic (ascorbic acid and glutathione) antioxidants. Proline content was significantly higher at 1 and 2 ppm Se but diminished considerably at 4 and 6 ppm levels concomitant with the reduced growth. Exogenous application of proline (50 µM) resulted in substantiation of its endogenous levels that antagonised the toxic effects of Se by improving the growth of seedlings. The stress injury was reduced significantly with simultaneous increase in enzymatic and non-enzymatic antioxidants. Especially the components of ascorbate-glutathione cycle showed larger stimulation with proline application. The role of proline in mitigating the toxic effects of Se is discussed.

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Section: Se Effectsmentioning

confidence: 88%

Exogenous Proline Application Reduces Phytotoxic Effects of Selenium by Minimising Oxidative stress and Improves Growth in Bean (Phaseolus vulgaris L.) Seedlings

Aggarwal

Sharma

Kaur

et al. 2010

Biol Trace Elem Res

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“…Studies have shown that Se at low doses protect the plants from variety of abiotic stresses such as cold (Chu et al, 2010), drought (Hasanuzzaman and Fujita, 2011), desiccation (Pukacka et al, 2011), and metal stress (Kumar et al, 2012; Pandey and Gupta, 2015). Under stress conditions, reactive oxygen species are produced in plants which disrupt cell membranes, proteins etc.…”

Section: Beneficial Effects Of Selenium In Plantsmentioning

confidence: 99%

An Overview of Selenium Uptake, Metabolism, and Toxicity in Plants

2017

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Selenium (Se) is an essential micronutrient for humans and animals, but lead to toxicity when taken in excessive amounts. Plants are the main source of dietary Se, but essentiality of Se for plants is still controversial. However, Se at low doses protects the plants from variety of abiotic stresses such as cold, drought, desiccation, and metal stress. In animals, Se acts as an antioxidant and helps in reproduction, immune responses, thyroid hormone metabolism. Selenium is chemically similar to sulfur, hence taken up inside the plants via sulfur transporters present inside root plasma membrane, metabolized via sulfur assimilatory pathway, and volatilized into atmosphere. Selenium induced oxidative stress, distorted protein structure and function, are the main causes of Se toxicity in plants at high doses. Plants can play vital role in overcoming Se deficiency and Se toxicity in different regions of the world, hence, detailed mechanism of Se metabolism inside the plants is necessary for designing effective Se phytoremediation and biofortification strategies.

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“…Se increases plant resistance against oxidative stress caused by free oxygen radicals. The results showed that plant species grown in Se-enriched media demonstrated enhanced resistance to certain abiotic stresses [29][30][31][32][33][34][35][36]. Recently, it has been shown that Se has the ability to regulate the water status of plants under drought conditions [37].…”

Section: Introductionmentioning

confidence: 99%

Selenium Pretreatment Upregulates the Antioxidant Defense and Methylglyoxal Detoxification System and Confers Enhanced Tolerance to Drought Stress in Rapeseed Seedlings

Hasanuzzaman

Fujita

2011

Biol Trace Elem Res

317

152

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In order to observe the possible regulatory role of selenium (Se) in relation to the changes in ascorbate (AsA) glutathione (GSH) levels and to the activities of antioxidant and glyoxalase pathway enzymes, rapeseed (Brassica napus) seedlings were grown in Petri dishes. A set of 10-day-old seedlings was pretreated with 25 μM Se (Sodium selenate) for 48 h. Two levels of drought stress (10% and 20% PEG) were imposed separately as well as on Se-pretreated seedlings, which were grown for another 48 h. Drought stress, at any level, caused a significant increase in GSH and glutathione disulfide (GSSG) content; however, the AsA content increased only under mild stress. The activity of ascorbate peroxidase (APX) was not affected by drought stress. The monodehydroascorbate reductase (MDHAR) and glutathione reductase (GR) activity increased only under mild stress (10% PEG). The activity of dehydroascorbate reductase (DHAR), glutathione S-transferase (GST), glutathione peroxidase (GPX), and glyoxalase I (Gly I) activity significantly increased under any level of drought stress, while catalase (CAT) and glyoxalase II (Gly II) activity decreased. A sharp increase in hydrogen peroxide (H(2)O(2)) and lipid peroxidation (MDA content) was induced by drought stress. On the other hand, Se-pretreated seedlings exposed to drought stress showed a rise in AsA and GSH content, maintained a high GSH/GSSG ratio, and evidenced increased activities of APX, DHAR, MDHAR, GR, GST, GPX, CAT, Gly I, and Gly II as compared with the drought-stressed plants without Se. These seedlings showed a concomitant decrease in GSSG content, H(2)O(2), and the level of lipid peroxidation. The results indicate that the exogenous application of Se increased the tolerance of the plants to drought-induced oxidative damage by enhancing their antioxidant defense and methylglyoxal detoxification systems.

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Responses of Wheat Seedlings to Exogenous Selenium Supply Under Cold Stress

Cited by 162 publications

References 28 publications

Exogenous Proline Application Reduces Phytotoxic Effects of Selenium by Minimising Oxidative stress and Improves Growth in Bean (Phaseolus vulgaris L.) Seedlings

Exogenous Proline Application Reduces Phytotoxic Effects of Selenium by Minimising Oxidative stress and Improves Growth in Bean (Phaseolus vulgaris L.) Seedlings

An Overview of Selenium Uptake, Metabolism, and Toxicity in Plants

Selenium Pretreatment Upregulates the Antioxidant Defense and Methylglyoxal Detoxification System and Confers Enhanced Tolerance to Drought Stress in Rapeseed Seedlings

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