Leibniz Institute of Plant Genetics and Crop Plant Research (IPK), Gatersleben, Germany.
Plant Signal Behav. 2012 Jul;7(7):711-3. doi: 10.4161/psb.20337. Epub 2012 Jul 1.
On the search for sparingly available nutrients, plants may alter their root architecture to improve soil exploration. So far, the examples for root system modifications induced by a heterogeneous availability of nutrients have been reported for the macronutrients nitrogen (N) and phosphorous (P). In an attempt to extend this type of knowledge to other nutrients, we recently provided evidence that Arabidopsis roots are able to sense a local availability of the micronutrient iron (Fe) and to respond with lateral root elongation into the Fe-containing patch. This specific root response was caused by enhanced elongation of cells leaving the root meristem and was dependent on an AUX1-mediated auxin accumulation in the lateral root apices. In this report, we compare mechanisms underlying this response with those known for other nutrients and show that a substantial genotypic variation exists among accessions of A. thaliana in the responsiveness of lateral roots toward localized Fe supplies.
在寻找稀缺营养物质的过程中，植物可能会改变其根系结构，以改善土壤的勘探。到目前为止，已有报道称，在氮 (N) 和磷 (P) 等大量营养物质的不均匀供应条件下，根系系统会发生改变。为了将此类知识扩展到其他营养物质，我们最近的研究结果表明，拟南芥的根系能够感知局部铁 (Fe) 的可用性，并通过向含有 Fe 的斑块伸长侧根来对此做出响应。这种特定的根系反应是由离开根分生组织的细胞伸长引起的，并且依赖于 AUX1 介导的侧根顶端生长素的积累。在本报告中，我们比较了这种响应的机制与其他营养物质的机制，结果表明，在拟南芥不同品系中，侧根对局部铁供应的响应存在明显的基因型差异。
