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Physiological Mechanism of Exogenous 5-Aminolevulinic Acid Improved the Tolerance of Chinese Cabbage ( L.) to Cadmium Stress. | LitMetric

AI Article Synopsis

  • - The study explored the effects of 5-aminolevulinic acid (ALA) on Chinese cabbage seedlings exposed to cadmium (Cd) stress, highlighting ALA's ability to alleviate Cd toxicity by maintaining plant health and structure.
  • - Results showed that Cd exposure decreased biomass and root length while increasing harmful substances like malondialdehyde (MDA) and hydrogen peroxide (HO), but ALA application improved antioxidant enzyme activity and reduced these negative effects.
  • - ALA also enhanced chlorophyll content and photosynthetic performance, protected cell structures, and downregulated genes responsible for Cd absorption, leading to lower Cd levels in the plants.

Article Abstract

The 5-aminolevulinic acid (ALA), a new type of plant growth regulator, can relieve the toxicity of cadmium (Cd) to plants. However, its mechanism has not been thoroughly studied. In the study, the roles of ALA have been investigated in the tolerance of Chinese cabbage ( L.) seedlings to Cd stress. The results showed that Cd significantly reduced the biomass and the length of the primary root of seedlings but increased the malondialdehyde (MDA) and the hydrogen peroxide (HO) contents. These can be effectively mitigated through the application of ALA. The ALA can further induce the activities of antioxidant enzymes in the ascorbate-glutathione (AsA-GSH) cycle under Cd stress, which resulted in high levels of both GSH and AsA. Under ALA + Cd treatment, the seedlings showed a higher chlorophyll content and photosynthetic performance in comparison with Cd treatment alone. Microscopic analysis results confirmed that ALA can protect the cell structure of shoots and roots, i.e., stabilizing the morphological structure of chloroplasts in leaf mesophyll cells. The qRT-PCR results further reported that ALA downregulated the expressions of Cd absorption and transport-related genes in shoots ( and ) and roots (, and ), which resulted in the low Cd content in the shoots and roots of cabbage seedlings. Taken together, the exogenous application of ALA alleviates Cd stress through maintaining redox homeostasis, protecting the photosynthetic system, and regulating the expression of Cd transport-related genes in Chinese cabbage seedlings.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9199490PMC
http://dx.doi.org/10.3389/fpls.2022.845396DOI Listing

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