Effect of aluminium on ion uptake and H+ release by maize
Effect of aluminium on ion uptake and H+ release by maize
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DOI：
10.1046/j.1469-8137.1997.00858.x
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发表时间：
1997-12-01
期刊：
影响因子：
9.4
通讯作者：
Jaillard, B
中科院分区：
文献类型：
--
作者：
Calba, H;Jaillard, B
本研究的目的是量化的长期影响，铝在溶液中的矿物离子吸收和相关的H+释放的玉米根种植的条件下，兼容的字段数据。两种玉米（Zea mays L.）比较了对Al不同敏感性的cvs。在0-30 μ M Al的存在下，在水培条件下进行2-5 d的培养期。使用琼脂糖凝胶上的溴甲酚绿色的视频光密度法，质子通量被定位沿着根。铝减少了阴离子的吸收，特别是NO3-，而K+和NH 4+的吸收不受影响。这些影响是伴随着净H+释放的增加，这是定量与减少NO3-吸收。NO3-吸收的减少和随之而来的H+释放的增加与Al在根中积累的量增加，这本身取决于溶液中的Al浓度。铝敏感的品种绑定更多的铝比铝耐受的根; NO3-吸收的减少和H+释放的增加也更大的铝敏感的品种。染料指示剂视频光密度测定结果表明，根系H+释放量普遍增加，这一结果说明了Al在根系中的沉积、NO3-吸收的减少与植物刺激根际酸化之间的关系。他们表明，与玉米，铝诱导NO3-吸收的抑制和净H+释放的增加，在1：1的比例。这些伴随的影响表明，抑制NO3-/OH-交换揭露积极的H+排泄，否则不敏感铝。这两种效果是密切相关的铝含量在每单位根长的根表示。
The aim of this study was to quantify the long-term effects of Al in solution on mineral ion uptake and associated H+ release by the roots of maize cultivated in conditions compatible with field data. Two maize (Zea mays L.) cvs of differing sensitivity to Al were compared. The culture was conducted in hydroponic conditions for culture periods of 2-5 d in the presence of 0-30 mu M Al. Proton fluxes were localized along the roots using a videodensitometry method with bromocresol green on agarose gel.Aluminium reduced the uptake of anions, particularly NO3-, whereas the uptake of K+ and NH4+ was unaffected. These effects were accompanied by an increase in net H+ release which was quantitatively comparable with the reduction in NO3- uptake. The reduction in NO3- uptake and the concomitant increase in H+ release increased with the quantity of Al accumulated in the roots, which was itself dependent on the concentration of Al in solution. The Al-sensitive cultivar bound more Al to its roots than the Al-tolerant one; the reduction in NO3- uptake and the increase in H+ release were also greater in the Al-sensitive cv. Dye indicator videodensitometry showed that the increased H+ release was general all along the roots.These results led us to specify the relation between the Al deposition in roots, the reduction in NO3- uptake and the stimulation in rhizosphere acidification by the plants. They show that, with maize, Al induces an inhibition in NO3- uptake and an increase in net H+ release in a 1:1 ratio. These concomitant effects suggest that inhibition in NO3-/OH- exchange unmasks active H+ excretion which is otherwise insensitive to Al. Both these effects are closely related to the Al content in roots expressed per unit root length.