Oncel I, Keleş Y, Ustün A S
Department of Biology, Faculty of Science, Ankara University, 06100 Tandogan, Ankara, Turkey.
Environ Pollut. 2000 Mar;107(3):315-20. doi: 10.1016/s0269-7491(99)00177-3.
In this study, the interaction between temperature and heavy metal stress was investigated in two wheat varieties (Triticum aestivum L. cv. Gerek-79 and Bolal-2973). Effects of different concentrations of lead and cadmium (0, 50, 100, 250, 500 mg l(-1)) simultaneously applied at various temperatures (8/4, 25/18, 35/26 degrees C day/night) to the seedlings were detected by measuring changes in the plant length, percentage of dry weight, chlorophyll (a, b, a/b), total soluble phenolics, and free proline. At the high cadmium concentrations, significant changes occurred in plant length and in the amounts of dry weight, chlorophyll, total soluble phenolics, and free proline. Significant differences were not observed in the parameters examined for the lead treatments. These data indicated that heavy metal toxicity increases in parallel with temperature. In addition, lead did not have any toxic effects on plants in sand-perlite mixture at 500 mg l(-1), whereas cadmium showed toxic effect even at such low concentrations as 50 mg l(-1).
在本研究中，对两个小麦品种（普通小麦品种Gerek - 79和Bolal - 2973）温度与重金属胁迫之间的相互作用进行了研究。通过测量植株长度、干重百分比、叶绿素（a、b、a/b）、总可溶性酚类物质和游离脯氨酸的变化，检测了在不同温度（8/4、25/18、35/26℃日/夜）下同时施加不同浓度铅和镉（0、50、100、250、500 mg l(-1)）对幼苗的影响。在高镉浓度下，植株长度、干重、叶绿素、总可溶性酚类物质和游离脯氨酸的含量发生了显著变化。在铅处理的各项参数中未观察到显著差异。这些数据表明，重金属毒性随温度升高而增加。此外，500 mg l(-1)的铅对砂 - 珍珠岩混合物中的植物没有任何毒性作用，而镉即使在50 mg l(-1)这样的低浓度下也表现出毒性作用。
