Abstract
The regulatory role of salicylic acid (SA) has been extensively reported in plants subjected to cadmium (Cd) stress. However, the underlying mechanisms still remain to be elucidated. This study provided evidence that root biological processes played crucial roles in SA-altering Arabidopsis plant responses to Cd stress. The nahG (naphthalene hydroxylase G)-transformed plants (with a significantly reduced endogenous SA) displayed a stronger tolerance, while the mutant snc1 (suppressor of nonexpressor of PR gene, constitutive 1; with high endogenous SA) was more sensitive, compared with wild-type (WT) plants under Cd stress. Correspondingly, a stronger antioxidative defense and a weaker oxidative stress were detected in nahG roots, while a more severe oxidative damage occurred in snc1 roots. The expression of a set of redox-related genes was examined, and mostly presented a higher level in nahG roots. A higher content of total flavonoids was observed in nahG roots under Cd stress, which was positively correlated with the expression of flavonoid biosynthesis-related genes. The metal-chelating and -sequestrating genes presented higher expression levels in nahG than in other two genotypes following Cd exposure. Noticeably, the pectin methylesterase inhibitor-encoding genes displayed dramatically high basal expression levels in nahG roots, and further induced under Cd stress. Accordingly, the pectin methylesterase activity was the least in nahG under both control and Cd stress. These results suggest that nahG-conferred Cd tolerance is associated with the root antioxidation defense, flavonoid biosynthesis, metal chelation and sequestration, and cell wall modification.
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Abbreviations
- nahG:
-
Naphthalene hydroxylase G
- PC:
-
Phytochelatin
- PCS:
-
Phytochelatin synthase
- PMEI:
-
Pectin methylesterase inhibitor
- SA:
-
Salicylic acid
- snc1:
-
Suppressor of npr1-1 constitutive 1
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This study was supported by the National Natural Science Foundation of China (Grant Nos. 31572213 to HL, 31570502 to LGZ).
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Zhao, Q., Gu, C., Sun, Y. et al. Root Defense in Salicylic Acid-Altering Arabidopsis Plants in Responses to Cadmium Stress. J Plant Growth Regul 40, 1764–1776 (2021). https://doi.org/10.1007/s00344-020-10233-x
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DOI: https://doi.org/10.1007/s00344-020-10233-x