Modulation of Copper Uptake and Toxicity by Abiotic Stresses in Matricaria chamomilla Plants
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- 作者：Jozef Kov谩膷ik ; Bo艡ivoj Klejdus ; Josef Hedbavny ; Franti拧ek 艩tork ; Ji艡ı ; ́ ; Gr煤z
- 刊名：Journal of Agricultural and Food Chemistry
- 出版年：2012
- 出版时间：July 11, 2012
- 年：2012
- 卷：60
- 期：27
- 页码：6755-6763
- 全文大小：252K
- 年卷期：v.60,no.27(July 11, 2012)
- ISSN：1520-5118
文摘
The impact of salinity (S) or nitrogen deficiency (鈭扤) on copper (Cu) uptake and changes to metabolism were studied in the combined treatments after 7 days of exposure. S suppressed growth, water content, soluble proteins, and reducing sugars more negatively than 鈭扤. ROS (hydrogen peroxide and superoxide) were differentially but relatively slightly affected while peroxidase activities were strongly elevated mainly in Cu+NaCl variant. Total soluble phenols and individual phenolic acids (free and cell wall-bound fraction) were accumulated the most in Cu鈥揘 while, among free amino acids, proline sharply increased in Cu+NaCl; this suggests a compensatory mechanism between the syntheses of antioxidants aimed to maintain antioxidative protection because numerous root phenolic acids were even depressed by S. Salinity also suppressed accumulation of coumarin herniarin, but its glucosidic precursors ((Z)- and (E)-2-脽-class="smallcaps">d-glucopyranosyloxy-4-methoxycinnamic acids) increased. Activities of selected phenolic enzymes were rather suppressed by S after a given exposure period while lignin content increased, suggesting different time dynamics if S and 鈭扤 variants are compared. Selected mineral nutrients (K, Fe, and partially Mg) were more reduced by S than by 鈭扤. Shoot and root Cu amounts were depressed by 鈭扤 but elevated by S. Significance and possible role of observed metabolic changes in relation to Cu accumulation are discussed.