Alleviation of Copper Toxicity in Arabidopsis thaliana by Silicon Addition to Hydroponic Solutions
By Jie Li, S. Leisner, J. Frantz. 2008
110 citations recorded by the source corpus.
Copper (Cu) is an essential micronutrient for plants and is the a.i. in pesticides for some pathogens and algae. Elevated doses of Cu can cause toxicity in plants. While silicon (Si) is reported to alleviate the toxicity of some heavy metals, its role in reducing the symptoms induced by excess Cu is unclear. Therefore, the role of Si in plant response to Cu stress was investigated in arabidopsis (Arabidopsis thaliana (L.) Heyn.). Based on plant symptoms (a reduction of leaf chlorosis as well as increased shoot and root biomass) and a reduction of phenylalanine ammonia lyase (PAL (EC 4.3.1.5), a stress-induced enzyme) activity in the shoot, Si was found to alleviate copper stress. Real- time reverse transcriptase-polymerase chain reaction analyses indicated that the RNA levels of two arabidopsis copper transporter genes, copper transporter 1 (COPT1) and heavy metal ATPase subunit 5 (HMA5) were induced by high levels of Cu, but were significantly decreased when Si levels were also elevated. Taken together, our findings indicate that Si addition can improve the resistance of arabidopsis to Cu stress, and this improvement operates on multiple levels, ranging from physiological changes to alterations of gene expression.
Subfields: Geochemistry and Petrology, Plant Science
View Paper: https://www.semanticscholar.org/paper/3e2871f05b626fdb092b2744f95dec75b406da76
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Citations in the corpus
- Mechanisms of Enhanced Heavy Metal Tolerance in Plants by Silicon： A Review (2013, background): “, reduction in plant biomass and leaf chlorosis) in Arabidopsis under Cu stress, but the leaf Cu concentration was not significantly changed as a result of Si addition, suggesting that Si influenced the distribution or bioavailability of Cu within leaves under Cu stress (Li et al., 2008).”