The effect of iron on the primary root elongation of Arabidopsis during phosphate deficiency
The effect of iron on the primary root elongation of Arabidopsis during phosphate deficiency
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DOI：
10.1104/pp.108.118562
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发表时间：
2008-07-01
期刊：
影响因子：
7.4
通讯作者：
Raghothama, Kashchandra G.
中科院分区：
文献类型：
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作者：
Ward, James T.;Lahner, Brett;Raghothama, Kashchandra G.
根构型差异与植物在缺磷土壤上的存活以及磷高效作物品种的产量提高有关。为了了解这些差异是如何产生的，我们研究了缺磷拟南芥（拟南芥哥伦比亚-0）植物的根结构。这些植物的根结构的一个显著方面是，当生长在缺磷培养基上时，它们的主根伸长受到抑制。在这里，我们提出的证据表明，这种抑制是铁（Fe）毒性的结果。当缺磷培养基中的铁浓度降低时，我们观察到主根的伸长，而不增加磷的可用性或相应的变化，在磷缺乏调节基因的表达。初生根伸长的恢复与较大的植株重量、从培养基中吸收P的能力提高和组织P含量增加有关。这表明，操纵植物的铁的可用性可能是一个有价值的策略，提高植物的耐受磷缺乏的能力。
Root architecture differences have been linked to the survival of plants on phosphate (P)-deficient soils, as well as to the improved yields of P-efficient crop cultivars. To understand how these differences arise, we have studied the root architectures of P-deficient Arabidopsis (Arabidopsis thaliana Columbia-0) plants. A striking aspect of the root architecture of these plants is that their primary root elongation is inhibited when grown on P-deficient medium. Here, we present evidence suggesting that this inhibition is a result of iron (Fe) toxicity. When the Fe concentration in P-deficient medium is reduced, we observe elongation of the primary root without an increase in P availability or a corresponding change in the expression of P deficiency-regulated genes. Recovery of the primary root elongation is associated with larger plant weights, improved ability to take up P from the medium, and increased tissue P content. This suggests that manipulating Fe availability to a plant could be a valuable strategy for improving a plant's ability to tolerate P deficiency.