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首页> 外文期刊>The New Phytologist >Citrate exudation from white lupin induced by phosphorus deficiency differs from that induced by aluminum
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Citrate exudation from white lupin induced by phosphorus deficiency differs from that induced by aluminum

机译：磷缺乏导致白羽扇豆的柠檬酸盐渗出与铝引起的柠檬酸盐渗出不同

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摘要

Both phosphorus (P) deficiency and aluminum (Al) toxicity induce root exudation of carboxylates, but the relationship between these two effects is not fully understood. Here, carboxylate exudation induced by Al in Lupinus albus (white lupin) was characterized and compared with that induced by P deficiency. Aluminum treatments were applied to whole root systems or selected root zones of plants with limited (1 microM) or sufficient (50 microM) P supply. Aluminum stimulated citrate efflux after 1-2 h; this response was not mimicked by a similar trivalent cation, La(3+). P deficiency triggered citrate release from mature cluster roots, whereas Al stimulated citrate exudation from the 5- to 10-mm subapical root zones of lateral roots and from mature and senescent cluster roots. Al-induced citrate exudation was inhibited by P limitation at the seedling stage, but was stimulated at later growth stages. Citrate exudation was sensitive to anion-channel blockers. Al treatments did not affect primary root elongation, but inhibited the elongation of lateral roots. The data demonstrate differential patterns of citrate exudation in L. albus, depending on root zone, developmental stage, P nutritional status and Al stress. These findings are discussed in terms of possible functions and underlying mechanisms.
机译：磷（P）缺乏和铝（Al）毒性均可诱导羧酸根的渗出，但是这两种作用之间的关系尚未完全了解。在这里，表征了由Al诱导的羽扇豆（白色羽扇豆）中的羧酸盐渗出，并将其与磷缺乏引起的羧酸盐渗出进行了比较。将铝处理应用于磷供应有限（1 microM）或足够（50 microM）的植物的整个根系或选定的根系。铝刺激柠檬酸盐外流1-2小时;此响应没有被类似的三价阳离子La（3+）模仿。磷缺乏引起柠檬酸盐从成熟簇状根中释放出来，而铝刺激柠檬酸盐从侧根的5至10 mm根尖下根区以及成熟和衰老簇状根中渗出。铝诱导的柠檬酸盐渗出在苗期受到磷的限制，但在生育后期受到刺激。柠檬酸盐渗出对阴离子通道阻滞剂敏感。铝处理不会影响主根的伸长，但会抑制侧根的伸长。数据表明，根据根部区域，发育阶段，磷营养状况和铝胁迫，柠檬白杨中柠檬酸盐渗出的不同模式。将根据可能的功能和潜在机制来讨论这些发现。

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