期刊
ANNALS OF BOTANY
卷 112, 期 6, 页码 965-972出版社
OXFORD UNIV PRESS
DOI: 10.1093/aob/mct163
关键词
Selenium toxicity; oxidative stress; selenoproteins; glutathione; diselenide bonds; ironselenium cluster; electron transport; proteasome; misfolded proteins
资金
- National Science Foundation [MCB-0950648]
- Direct For Biological Sciences
- Div Of Molecular and Cellular Bioscience [1244009] Funding Source: National Science Foundation
- Direct For Biological Sciences
- Div Of Molecular and Cellular Bioscience [0950648] Funding Source: National Science Foundation
Despite seleniums toxicity in plants at higher levels, crops supply most of the essential dietary selenium in humans. In plants, inorganic selenium can be assimilated into selenocysteine, which can replace cysteine in proteins. Selenium toxicity in plants has been attributed to the formation of non-specific selenoproteins. However, this paradigm can be challenged now that there is increasingly abundant evidence suggesting that selenium-induced oxidative stress also contributes to toxicity in plants. This Botanical Briefing summarizes the evidence indicating that selenium toxicity in plants is attributable to both the accumulation of non-specific selenoproteins and selenium-induced oxidative stress. Evidence is also presented to substantiate the claim that inadvertent selenocysteine replacement probably impairs or misfolds proteins, which supports the malformed selenoprotein hypothesis. The possible physiological ramifications of selenoproteins and selenium-induced oxidative stress are discussed. Malformed selenoproteins and oxidative stress are two distinct types of stress that drive selenium toxicity in plants and could impact cellular processes in plants that have yet to be thoroughly explored. Although challenging, deciphering whether the extent of selenium toxicity in plants is imparted by selenoproteins or oxidative stress could be helpful in the development of crops with fortified levels of selenium.
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