Journal
CHEMOSPHERE
Volume 278, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2021.130397
Keywords
Aluminum; Heat shock; Cross-tolerance; Wheat; AsA-GSH system
Categories
Funding
- National Natural Science Foundation of China [22006130, 31872167]
- Zhejiang Provincial Natural Science Foundation of China [LQ21C150007]
- Fundamental Research Funds for the Central Universities [2020QNA6013]
Ask authors/readers for more resources
The study found that exposing wheat seedlings to short-term high temperature significantly alleviated aluminum-induced root growth inhibition, while maintaining lower levels of lipid peroxidation and higher cell viability. Furthermore, the high temperature treatment increased the levels of reduced ascorbate and glutathione in wheat roots, as well as the activities of cycle-allied enzymes.
Aluminum (Al), a neurotoxin agent, is universal in the earth crust, but its bioavailability and toxicity are manifested under acidic conditions. Up to 60% of the acid soils are distributed in tropical and subtropical regions, where crops simultaneously experience heat-shock stress. Here, we investigated the effects of heat shock-priming on Al tolerance in two different wheat genotypes. Conditioning of wheat seedlings with short period high temperature significantly alleviated Al-induced root growth inhibition, but did not significantly affect Al accumulation. However, we observed that heat shock-primed roots maintained lower levels of lipid peroxidation and higher cell viability. These priming-triggered effects were associated with reactive oxygen species (ROS) homeostasis. Furthermore, conditioning of plants with high temperature increased the contents of reduced ascorbate and glutathione, and ratios of reduced to oxidized forms of these molecules in wheat roots. However, ascorbate or glutathione biosynthesis inhibitors markedly prevented heat shock priming-induced ROS reduction accompanied by aggravated root elongation. Moreover, heat shock-priming enhanced the metabolic intensity of ascorbate-glutathione cycle, as activities of the cycle-allied enzymes were significantly increased. These results suggest that heat-shock induces cross adaptation to Al toxicity through sustaining efficient ascorbate-glutathione cycle operation in wheat plants. (C) 2021 Elsevier Ltd. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available