Abstract
Exogenous regulation of plant physiology is a kind of effective approach to help plant grow under Cd (cadmium)-contaminated environment. CA (cinnamaldehyde) is an environmental friendly natural compound with medicinal properties and antimicrobial activities. In this work, we found that CA was able to confer plant Cd tolerance by priming defense in the root of B. rapa. Pretreatment with CA attenuated the phytotoxicity induced by subsequent Cd stress, such as root growth inhibition, ROS accumulation, oxidative injury, and cell death in root tip. Cd stress decreased the intracellular Ca2+ level in roots, which could be enhanced by pretreatment with CA. Pretreatment with a Ca2+ chelator or a Ca2+ channel blocker blocked all the beneficial effects of CA on the increase in the intracellular Ca2+ level and the amelioration of physiological injury in roots under Cd stress. Correlation analysis combined with cluster analysis suggested that CA was able to prime plant defense by regulating endogenous Ca2+ in order to facilitate Cd tolerance. These results shed a new light on the novel role of CA in modulating plant resistant physiology against metal stress, which may extend our knowledge on both CA and plant Cd tolerance.
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Acknowledgments
We thank Mr. Cunfa Xu from Central Laboratory, Jiangsu Academy of Agricultural Sciences, for his technical support during stereoscopic microscope study.
Funding
This study was supported by the National Natural Science Foundation of China (31771705), Jiangsu Agricultural Science and Technology Innovation Fund (CX(20)1011), and Program for Tackling Key Problems in Science and Technology of Henan Province (202102110046).
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Cheng, Y., Wang, N., Liu, R. et al. Cinnamaldehyde Facilitates Cadmium Tolerance by Modulating Ca2+ in Brassica rapa. Water Air Soil Pollut 232, 19 (2021). https://doi.org/10.1007/s11270-020-04952-w
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DOI: https://doi.org/10.1007/s11270-020-04952-w