Early responses of maize seedlings to Cu stress include sharp decreases in gibberellins and jasmonates in the root apex
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Otros documentos de la autoría: Matayoshi, Carolina; Pena, Liliana; Arbona, Vicent; Gomez-Cadenas, Aurelio; Gallego, Susana M.
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https://doi.org/10.1007/s00709-020-01504-1 |
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Título
Early responses of maize seedlings to Cu stress include sharp decreases in gibberellins and jasmonates in the root apexAutoría
Fecha de publicación
2020Editor
Springer VerlagISSN
0033-183X; 1615-6102Cita bibliográfica
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/s00709-020-01504-1Tipo de documento
info:eu-repo/semantics/articleVersión de la editorial
https://link.springer.com/article/10.1007/s00709-020-01504-1Versión
info:eu-repo/semantics/publishedVersionPalabras clave / Materias
Resumen
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. [-]
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Protoplasma (2020)Proyecto de investigación
20020170100331BA UBACYT, PIP 0266Derechos de acceso
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