Early responses of maize seedlings to Cu stress include sharp decreases in gibberellins and jasmonates in the root apex
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https://doi.org/10.1007/s00709-020-01504-1 |
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Title
Early responses of maize seedlings to Cu stress include sharp decreases in gibberellins and jasmonates in the root apexAuthor (s)
Date
2020Publisher
Springer VerlagISSN
0033-183X; 1615-6102Bibliographic citation
Matayoshi, C.L., Pena, L.B., Arbona, V. et al. Early responses of maize seedlings to Cu stress include sharp decreases in gibberellins and jasmonates in the root apex. Protoplasma (2020). https://doi.org/10.1007/s00709-020-01504-1Type
info:eu-repo/semantics/articlePublisher version
https://link.springer.com/article/10.1007/s00709-020-01504-1Version
info:eu-repo/semantics/publishedVersionSubject
Abstract
Copper (Cu) interferes with numerous biological functions in plants, including plant growth, which is partly governed by
plant hormones. In the present study, Cu stress effect on the roots of pre-emerging maize ... [+]
Copper (Cu) interferes with numerous biological functions in plants, including plant growth, which is partly governed by
plant hormones. In the present study, Cu stress effect on the roots of pre-emerging maize seedlings in terms of growth,
nutrient composition, protein modifications, and root hormone homeostasis was investigated, focusing on possible
metabolic differences between the root apex and the rest of the root tissues. Significant decreases in root length and
root biomass after 72 h of Cu exposure (50 and 100 μM CuCl2), accompanied by reductions in Ca, Mg, and P root
contents, were found. Cu also generated cell redox imbalance in both root tissues and revealed by altered enzymatic and
non-enzymatic antioxidant defenses. Oxidative stress was evidenced by an increased protein carbonylation level in both
tissues. Copper also induced protein ubiquitylation and SUMOylation and affected 20S proteasome peptidase activities
in both tissues. Drastic reductions in ABA, IAA, JA (both free and conjugated), GA3, and GA4 levels in the root apex
were detected under Cu stress. Our results show that Cu exposure generated oxidative damage and altered root hormonal
homeostasis, mainly at the root apex, leading to a strong root growth inhibition. Severe protein post-translational
modifications upon Cu exposure occurred in both tissues, suggesting that even when hormonal adjustments to cope
with Cu stress occurred mainly at the root apex, the entire root is compromised in the protein turnover that seems to be
necessary to trigger and/or to sustain defense mechanisms against Cu toxicity. [-]
Is part of
Protoplasma (2020)Investigation project
20020170100331BA UBACYT, PIP 0266Rights
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