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NRT1.1 Regulates Nitrate Allocation and Cadmium Tolerance in Arabidopsis
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NRT1.1 Regulates Nitrate Allocation and Cadmium Tolerance in Arabidopsis
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NRT1.1 Regulates Nitrate Allocation and Cadmium Tolerance in Arabidopsis
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Journal Article
NRT1.1 Regulates Nitrate Allocation and Cadmium Tolerance in Arabidopsis
2019
Overview
Abiotic stress induces nitrate (NO
) allocation to roots, which increases stress tolerance in plants. NRT1.1 is broadly involved in abiotic stress tolerance in plants, but the relationship between NRT1.1 and NO
allocation under stress conditions is unclear. In this study, we found that Arabidopsis wild-type Col-0 was more cadmium (Cd
)-tolerant than the
mutant at 20 μM CdCl
. Cd
exposure repressed
but upregulated
in roots of Col-0 plants, resulting in increased NO
allocation to roots and higher [NO
] root-to-shoot (R:S) ratios. Interestingly,
(
) was upregulated by Cd
stress in Col-0 but not in
. Under Cd
stress,
and
mutants exhibited similar phenotypes and NO
allocation patterns as observed in the
mutant, but overexpression of
in Col-0 and
increased the [NO
] R:S ratio and restored Cd
stress tolerance. Our results indicated that
and
regulated Cd
stress-induced NO
allocation to roots and that
functioned downstream of
. Cd
uptake did not differ between Col-0 and
, but Cd
allocation to roots was higher in Col-0 than in
. Stressed Col-0 plants increased Cd
and NO
allocation to root vacuoles, which reduced their cytosolic allocation and transport to the shoots. Our results suggest that NRT1.1 regulates NO
allocation to roots by coordinating Cd
accumulation in root vacuoles, which facilitates Cd
detoxification.
