Issue 10, 2022

Nanomaterial-modulated cellular sodium extrusion and vacuolar sequestration for salt tolerance

Abstract

Nanomaterials can induce plant tolerance to abiotic environmental stresses, whereas the sensing mechanism and the resulting response at the cellular level need further exploration. Bright Yellow 2 tobacco (Nicotiana tabacum L.) suspension-cultured cells challenged with 100 mM NaCl were exposed to increasing doses (0.05, 0.1, and 0.5 mg L−1) of nano-CeO2 (nCeO2) or nitrogen-doped carbon dots (N-CDs). nCeO2 at 0.1 mg L−1 or N-CDs at 0.5 mg L−1 were optimal for alleviating salt stress and nCeO2 was superior to N-CDs. Notably, the expression of genes (IPUT1, SOS3, SOS2, and SOS1) involved in Na+-GIPC perception-Na+-extrusion was stimulated (5.3-fold) after nCeO2 exposure for 4 h, and NHX1 encoding Na+ vacuolar sequestration was induced by 7.8-fold after N-CDs treatment for 6 h. Subsequently, the net Ca2+ influx and Na+ efflux were strongly promoted by 293.6% and 191.3% after incubation with nCeO2, while no obvious Na+ extrusion but the transient K+ influx (by 3.0-fold) was observed for N-CDs. The downstream metabolic modifications in fatty acids, or amino acids and carbohydrates could favor the adaptation to salt stress. This work reveals the specific nanomaterial-induced early cell perception and signaling cascade, contributing to the nano-based agricultural practices for combating salt stress.

Graphical abstract: Nanomaterial-modulated cellular sodium extrusion and vacuolar sequestration for salt tolerance

Supplementary files

Article information

Article type
Paper
Submitted
29 Jan 2022
Accepted
07 Leo 2022
First published
08 Leo 2022

Environ. Sci.: Nano, 2022,9, 4018-4026

Nanomaterial-modulated cellular sodium extrusion and vacuolar sequestration for salt tolerance

F. Chen, L. Zhu, J. Tang, C. Wang, L. Yue, P. Schröder and Z. Wang, Environ. Sci.: Nano, 2022, 9, 4018 DOI: 10.1039/D2EN00623E

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