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Cadmium (Cd) is a serious threat to plants health. Though some genes have been reported to get involved in the regulation of tolerance to Cd, the mechanisms underlying this process are not fully understood. Na/H antiporter (NHX1) plays an important role in Na/H trafficking. The salt and cadmium stress tolerance were found to be enhanced by NHX1 in duckweed according to our previous study, however, its function in Cd flux under Cd stress has not been studied. Here we explored the Cd flux in wild type (WT) and NHX1 transgenic duckweed (NHX1) under Cd stress. We found that the Cd influx in NHX1 duckweed was significantly declined, followed by an increased Cd efflux after 20 min treatment of Cd, which resulted a less accumulation of Cd in NHX1. Reversely, inhibition of NHX1 by amiloride treatment, enhanced Cd influx in NHX1 duckweed, subsequently delayed Cd efflux in both genotypes of duckweed under Cd shock. H efflux in NHX1 duckweed was lower compare with that in WT with 20 min Cd shock. NHX1 also increased the pH value with Cd stress in the transgenic rhizoid. These finding suggested a new function of NHX1 in regulation of Cd and H flow during short-term Cd shock.
This article was published in the following journal.
Name: Ecotoxicology and environmental safety
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Unstable isotopes of cadmium that decay or disintegrate emitting radiation. Cd atoms with atomic weights 103-105, 107, 109, 115, and 117-119 are radioactive cadmium isotopes.
Inorganic compounds that contain cadmium as an integral part of the molecule.
Poisoning occurring after exposure to cadmium compounds or fumes. It may cause gastrointestinal syndromes, anemia, or pneumonitis.
An element with atomic symbol Cd, atomic number 48, and atomic weight 114. It is a metal and ingestion will lead to CADMIUM POISONING.
A cadmium halide in the form of colorless crystals, soluble in water, methanol, and ethanol. It is used in photography, in dyeing, and calico printing, and as a solution to precipitate sulfides. (McGraw-Hill Dictionary of Scientific and Technical Terms, 5th ed)
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