Importance of plant species and external silicon concentration to active silicon uptake and transport
Importance of plant species and external silicon concentration to active silicon uptake and transport
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DOI：
10.1111/j.1469-8137.2006.01797.x
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发表时间：
2006-01-01
期刊：
影响因子：
9.4
通讯作者：
Roemheld, Volker
中科院分区：
文献类型：
--
作者：
Liang, Yongchao;Hua, Haixia;Roemheld, Volker
在这里，我们通过一系列水培实验表征了水稻、玉米、向日葵和 Benincase hispida 的硅 (Si) 吸收和木质部负荷。主动和被动硅吸收成分在所有测试的植物中共存。活性成分是水稻和玉米吸收 Si 的主要机制。相比之下，在较高的外部 Si 浓度（0.85 mM）下，H. annuus 和 B. hispida 中被动吸收占主导地位，而活性成分持续存在并贡献总 Si 吸收，特别是在较低的外部 Si 浓度（0.085 mM）下。短期实验表明，代谢抑制剂显着抑制了 O. sativa 和 Z. mays 的 Si 吸收。或低温，无论外部硅浓度如何。相比之下，在较低浓度（例如 0.085 mM）的外部 Si 浓度下（例如 0.085 mM），代谢抑制剂或低温对 H. annuus 和 B. hispida 的 Si 吸收的抑制比在较高浓度（例如 1.70 mM）下更显着。外部硅浓度。
Here, we characterized silicon (Si) uptake and xylem loading in Oryza sativa, Zea mays, Helianthus annuus and Benincase hispida in a series of hydroponic experiments. Both active and passive Si-uptake components co-exist in all the plants tested. The active component is the major mechanism responsible for Si uptake in O. sativa and Z. mays.By contrast, passive uptake prevails in H. annuus and B. hispida at a higher external Si concentration (0.85 mM), while the active component constantly exists and contributes to the total Si uptake, especially at a lower external Si concentration (0.085 mM).Short experiments showed that Si uptake was significantly suppressed in O. sativa and Z. mays by metabolic inhibitors or low temperature, regardless of external Si concentrations. By contrast, Si uptake in H. annuus and B. hispida was inhibited more significantly by metabolic inhibitors or low temperature at lower (for example, 0.085 mM) than at higher (for example, 1.70 mM) external Si concentrations.It can be concluded that both active and passive Si-uptake components co-exist in O. sativa, Z. mays, H. annuus and B. hispida, with their relative contribution being dependent much upon both plant species and external Si concentrations.