Mohamed Sonia, Sentenac Hervé, Guiderdoni Emmanuel, Véry Anne-Aliénor, Nieves-Cordones Manuel
a Biochimie et Physiologie Moléculaire des Plantes, Institut de Biologie Intégrative des Plantes, UMR 5004 CNRS/UMR 0386 INRA/Montpellier SupAgro/Université Montpellier , Montpellier Cedex 2 , France.
b CIRAD, UMR AGAP , Montpellier cedex 5 , France.
Plant Signal Behav. 2018 Feb 1;13(2):e1428516. doi: 10.1080/15592324.2018.1428516. Epub 2018 Feb 6.
The root system anchors the plant to the soil and contributes to plant autotrophy by taking up nutrients and water. In relation with this nutritional function, root development is largely impacted by availability of nutrients and water. Due to human activity, plants, in particular crops, can also be exposed to pollutants which can be absorbed and incorporated into the food chain. Cesium in soils is present at non-toxic concentrations for the plant (micromolar or less), even in soils highly polluted with radioactive cesium due to nuclear accidents. Here, we report on the morphological response of rice roots to Cs at micromolar concentrations. It is shown that Cs reduces root elongation without affecting root dry weight. Noteworthy, inactivation of the Cs-permeable K transporter OsHAK1 prevents such effect of Cs, suggesting that internal Cs triggers the modification of the root system.
根系将植物固定在土壤中，并通过吸收养分和水分促进植物的自养。与这种营养功能相关，根系发育在很大程度上受到养分和水分有效性的影响。由于人类活动，植物，尤其是农作物，也可能接触到污染物，这些污染物可被吸收并纳入食物链。土壤中的铯即使在因核事故而受到放射性铯高度污染的土壤中，其浓度对植物来说也是无毒的（微摩尔或更低）。在此，我们报告了水稻根系对微摩尔浓度铯的形态学反应。结果表明，铯会降低根的伸长，但不影响根干重。值得注意的是，铯通透钾转运体OsHAK1的失活可防止铯的这种作用，这表明细胞内的铯会引发根系的改变。
