Saridis Georgios, Chorianopoulou Styliani N, Ventouris Yannis E, Sigalas Petros P, Bouranis Dimitris L
Botanical Institute, Cologne Biocenter, University of Cologne, D⁻50674 Cologne, Germany.
Plant Physiology and Morphology Laboratory, Crop Science Department, Agricultural University of Athens, 75 Iera Odos, Athens 11855, Greece.
Plants (Basel). 2019 May 18;8(5):133. doi: 10.3390/plants8050133.
Plants have developed sophisticated mechanisms for acquiring iron from the soil. In the graminaceous species, a chelation strategy is in charge, in order to take up ferric iron from the rhizosphere. The ferric iron chelation-strategy components may also be present in the aerial plant parts. The aim of this work was to search for possible roles of those components in maize leaves. To this end, the expression patterns of ferric iron chelation-strategy components were monitored in the leaves and roots of mycorrhizal and non-mycorrhizal sulfur-deprived maize plants, both before and after sulfate supply. The two levels of sulfur supply were chosen due to the strong impact of this nutrient on iron homeostasis, whilst mycorrhizal symbiosis was chosen as a treatment that forces the plant to optimize its photosynthetic efficiency, in order to feed the fungus. The results, in combination with the findings of our previous works, suggest a role for the aforementioned components in ferric chelation and/or unloading from the xylem vessels to the aerial plant parts. It is proposed that the gene expression of the DMA exporter can be used as an early indicator for the establishment of a mycorrhizal symbiotic relationship in maize.
植物已经进化出了复杂的机制来从土壤中获取铁。在禾本科植物中，一种螯合策略起主导作用，以便从根际吸收三价铁。三价铁螯合策略的成分也可能存在于植物地上部分。这项工作的目的是探究这些成分在玉米叶片中可能发挥的作用。为此，在供应硫酸盐之前和之后，对菌根和非菌根缺硫玉米植株的叶片和根中三价铁螯合策略成分的表达模式进行了监测。选择这两种硫供应水平是因为这种养分对铁稳态有强烈影响，而选择菌根共生作为一种处理方式，促使植物优化其光合效率，以便为真菌提供养分。这些结果与我们之前工作的发现相结合，表明上述成分在三价铁螯合和/或从木质部导管卸载到植物地上部分中发挥作用。有人提出，DMA转运蛋白的基因表达可以作为玉米中菌根共生关系建立的早期指标。
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