Abstract Festuca rubra L. plants are pseudometallophytes colonizing abandoned Pb/Zn mine areas, successfully employed in phytostabilization. To study the contribution of low-molecular weight organic acids to metal tolerance, F. rubra plants were grown for three months in hydroponics with Cd (1.8, 18 and 36 µmol L−1), Pb (50, 250 and 500 µmol L−1) and Zn (0.3, 3 and 6 mmol L−1), separately, and in ternary combination (18 µmol L−1 Cd + 250 µmol L−1 Pb + 0.3 mmol L−1 Zn). The roots retained most of the metals but their distribution from shoot to root was altered when the plants were treated with the ternary combination. The main organic acids in roots were citrate and malate. At the lowest concentrations, the metals caused small reductions in biomass, had no effects on photosynthetic pigments nor on malondialdehyde, but led to increases in root organic acids. At higher concentrations, phytotoxic responses were observed, associated with a decline of citrate and malate in the roots.

中文翻译：

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根有机酸对红羊茅对锌、铅、镉的耐受性的作用

摘要 Festuca rubra L. 植物是定植于废弃铅锌矿区的假金属植物，成功地用于植物稳定。为了研究低分子量有机酸对金属耐受性的贡献，F. rubra 植物在含有 Cd（1.8、18 和 36 µmol L-1）、Pb（50、250 和 500 µmol L-）的水培中生长了三个月1) 和 Zn（0.3、3 和 6 mmol L-1），分别和三元组合（18 µmol L-1 Cd + 250 µmol L-1 Pb + 0.3 mmol L-1 Zn）。根保留了大部分金属，但当植物用三元组合处理时，它们从芽到根的分布发生了变化。根中的主要有机酸是柠檬酸盐和苹果酸盐。在最低浓度下，金属会导致生物量小幅减少，对光合色素和丙二醛没有影响，但导致根系有机酸增加。在较高浓度下，观察到植物毒性反应，与根中柠檬酸盐和苹果酸盐的减少有关。