Abscisic acid modulates differential physiological and biochemical responses to cadmium stress in Brassica napus

ABSTRACT

The plant hormone abscisic acid (ABA) has been proved to be a key protector against abiotic stresses at appropriate concentrations. This study aimed to investigate the role of ABA in alleviating cadmium (Cd) stress in two Brassica napus of oil-vegetable dual-purpose (Youfei 1 and Xiangyou 787). Cd stress disturbed the normal growth of rapeseed, however, specific ABA concentrations could alleviate the effects of Cd stress in B. napus. The results confirmed that exogenous ABA mitigates the negative effects of Cd-induced plant toxicity in B. napus by increasing growth traits, enhancing pigment molecules, enhancing gas exchange in leaves, as well as regulating antioxidation and the expression levels of genes related to Cd stress. This study indicated that ABA played an important protective role in regulating cadmium resistance in Brassica napus, and provided basic data for its application in actual production.

KEYWORDS:

• Antioxidants
• Brassica napus
• cadmium stress
• exogenous abscisic acid
• physiological responses

Author Contributions

Conceptualization, L.L. and M.L.; methodology, Y.Q., M.L., and L.L.; figure and table analysis, Y.Q., S.W., and Y.T.; investigation, J.F., D.G., Y.Q., H.L., and Y.T.; writing—original draft preparation, Y.Q., C.J., and L.L; writing—review and editing, L.L., D.W., and M.Y. funding acquisition, L.L. All authors have read and agreed to the published version of the manuscript.

Disclosure statement

The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.

Additional information

Funding

This study was funded by National Natural Science Foundation of China (32071965).