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Internal Cs+ inhibits root elongation in rice.

Sonia Mohamed1,2, Hervé Sentenac1, Emmanuel Guiderdoni2

  • 1a 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.

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Summary

Cesium (Cs+) exposure at micromolar levels reduces rice root elongation by impacting nutrient uptake. Inactivating the OsHAK1 transporter blocks this Cs+ effect, indicating internal cesium influences root growth.

Keywords:
CRISPR-CasCesiumOsHAK1riceroot elongation

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Area of Science:

  • Plant Biology
  • Environmental Science
  • Toxicology

Background:

  • Plant roots anchor plants and absorb water and nutrients, crucial for survival and growth.
  • Crops can absorb environmental pollutants, including cesium (Cs+), from soil, potentially entering the food chain.
  • Cesium occurs at micromolar or lower concentrations in soil, even in areas affected by radioactive contamination.

Purpose of the Study:

  • To investigate the morphological effects of cesium (Cs+) on rice root development at environmentally relevant concentrations.
  • To determine the role of the potassium transporter OsHAK1 in mediating cesium's impact on root growth.

Main Methods:

  • Rice plants were exposed to micromolar concentrations of Cs+.
  • Root elongation and dry weight were measured.
  • The effect of Cs+ was assessed in plants with inactivated OsHAK1 transporter.

Main Results:

  • Cesium (Cs+) significantly reduced rice root elongation at micromolar concentrations.
  • Root dry weight remained unaffected by Cs+ exposure.
  • Inactivating the Cs+-permeable transporter OsHAK1 abolished the inhibitory effect of Cs+ on root elongation.

Conclusions:

  • Cesium (Cs+) exposure at micromolar levels induces root growth inhibition in rice.
  • The Cs+-induced root growth modification is mediated by the potassium transporter OsHAK1.
  • Internal cesium uptake and transport likely trigger downstream signaling pathways affecting root morphology.