Macnair Mark R, Cumbes Quinton
Department of Biological Sciences, Hatherly Laboratories, University of Exeter, Prince of Wales Road, Exeter EX4 4PS, UK.
New Phytol. 1987 Oct;107(2):387-394. doi: 10.1111/j.1469-8137.1987.tb00190.x.
The uptake of arsenate by arsenic tolerant and non-tolerant plants of Holcus lanatus L., and the interaction of this uptake with phosphate level, was studied. The tolerance of the different plants, as measured by root growth, was also investigated. Arsenate inhibited the root growth of non-tolerant plants much more than that of tolerant ones, but at low levels of arsenate, the high phosphate treatment reduced the toxicity of arsenate in non-tolerants but not in tolerants. Tolerant plants took up less arsenate than non-tolerants. The effect of phosphate on arsenate uptake was very small in the tolerant plants, but in non-tolerants phosphate inhibited arsenate uptake when the phosphate was at a higher concentration than arsenate. These results are compatible with the hypothesis that arsenate is taken up by the phosphate uptake system in non-tolerant plants, but in tolerant plants this system has become altered so that it no longer recognizes arsenate.
研究了耐砷和不耐砷的绒毛草（Holcus lanatus L.）对砷酸盐的吸收，以及这种吸收与磷酸盐水平的相互作用。还研究了通过根生长测量的不同植物的耐受性。砷酸盐对不耐砷植物根系生长的抑制作用远大于耐砷植物，但在低水平砷酸盐条件下，高磷酸盐处理降低了不耐砷植物中砷酸盐的毒性，而对耐砷植物则无此作用。耐砷植物吸收的砷酸盐比不耐砷植物少。磷酸盐对耐砷植物砷酸盐吸收的影响很小，但在不耐砷植物中，当磷酸盐浓度高于砷酸盐时，磷酸盐会抑制砷酸盐的吸收。这些结果与以下假设相符：在不耐砷植物中，砷酸盐通过磷酸盐吸收系统吸收，但在耐砷植物中，该系统已发生改变，不再识别砷酸盐。
