title: Regulation of the Phenylpropanoid Pathway: A Mechanism of Selenium Tolerance in Peanut (Arachis hypogaea L.) Seedlings.
abstract: To clarify the mechanisms of selenium (Se) tolerance in peanut seedlings, we grew peanut seedlings with sodium selenite (0, 3, and 6 mg/L), and investigated the phenylpropanoids metabolism in seedling roots. The results showed that selenite up-regulated the expression of genes and related enzyme activities involving in the phenylpropanoids biosynthesis cascade, such as phenylalanine ammonia-lyase, trans-cinnamate-4-hydroxylase, chalcone synthase, chalcone isomerase, and cinnamyl-alcohol dehydrogenase. Selenite significantly increased phenolic acids and flavonoids, which contributed to the alleviation of selenite-induced stress. Moreover, selenite enhanced the formation of endodermis in roots, which may be attributed to the up-regulation of lignin biosynthesis mediated by the selenite-induced changes of H2O2 and NO, which probably regulated the selenite uptake from an external medium. Accumulation of polyphenolic compounds via the phenylpropanoid pathway may be one of the mechanisms of the increasing selenite tolerance in plants, by which peanut seedlings survived in seleniferous soil, accompanied by accumulation of Se.
authors.affiliation: College of Food Science and Engineering, South China University of Technology , Guangzhou 510640, China.
authors.forename: Guang
authors.initials: G
authors.lastname: Wang
authors.affiliation: College of Food Science and Engineering, South China University of Technology , Guangzhou 510640, China.
authors.forename: Liying
authors.initials: L
authors.lastname: Wu
authors.affiliation: College of Food Science and Engineering, South China University of Technology , Guangzhou 510640, China.
authors.forename: Hong
authors.initials: H
authors.lastname: Zhang
authors.affiliation: College of Food Science and Engineering, South China University of Technology , Guangzhou 510640, China.
authors.forename: Wenjia
authors.initials: W
authors.lastname: Wu
authors.affiliation: College of Food Science and Engineering, South China University of Technology , Guangzhou 510640, China.
authors.forename: Mengmeng
authors.initials: M
authors.lastname: Zhang
authors.affiliation: College of Food Science and Engineering, South China University of Technology , Guangzhou 510640, China.
authors.forename: Xiaofeng
authors.initials: X
authors.lastname: Li
authors.affiliation: College of Food Science and Engineering, South China University of Technology , Guangzhou 510640, China.
authors.forename: Hui
authors.initials: H
authors.lastname: Wu
mesh_terms: D000217:Acyltransferases / Q000235:genetics / Q000378:metabolism; D000429:Alcohol Oxidoreductases / Q000235:genetics / Q000378:metabolism; D010367:Arachis / Q000201:enzymology / Q000235:genetics / Q000254:growth & development / Q000378:metabolism*; D053898:Biosynthetic Pathways; D018506:Gene Expression Regulation, Plant; D008031:Lignin / Q000378:metabolism; D010650:Phenylalanine Ammonia-Lyase / Q000235:genetics / Q000378:metabolism; D010940:Plant Proteins / Q000235:genetics / Q000378:metabolism; D059808:Polyphenols / Q000096:biosynthesis*; D036226:Seedlings / Q000254:growth & development* / Q000378:metabolism; D020887:Selenious Acid / Q000378:metabolism; D012643:Selenium / Q000378:metabolism*; D050564:Trans-Cinnamate 4-Monooxygenase / Q000235:genetics / Q000378:metabolism
chemical_list: D010940:Plant Proteins; D059808:Polyphenols; D008031:Lignin; D000429:Alcohol Oxidoreductases; C018656:cinnamyl alcohol dehydrogenase; D050564:Trans-Cinnamate 4-Monooxygenase; D000217:Acyltransferases; C020141:flavanone synthetase; D010650:Phenylalanine Ammonia-Lyase; D020887:Selenious Acid; D012643:Selenium
keywords: flavonoid; lignin; peanut; phenolic; phenylpropanoid pathway; selenium