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18 results on '"Missihoun, Tagnon D."'

5. Iron Availability Influences Protein Carbonylation in Arabidopsis thaliana Plants.

Author

Tola, Adesola J. and Missihoun, Tagnon D.

Subjects
*ARABIDOPSIS proteins, *IRON in the body, *ARABIDOPSIS thaliana, *HOMEOSTASIS, *POST-translational modification, *IRON proteins, *IRON deficiency, *ARABIDOPSIS, LEAF growth
Abstract

Protein carbonylation is an irreversible form of post-translational modification triggered by reactive oxygen species in animal and plant cells. It occurs either through the metal-catalyzed oxidation of Lys, Arg, Pro, and Thr side chains or the addition of α, β-unsaturated aldehydes and ketones to the side chains of Cys, Lys, and His. Recent genetic studies concerning plants pointed to an implication of protein carbonylation in gene regulation through phytohormones. However, for protein carbonylation to stand out as a signal transduction mechanism, such as phosphorylation and ubiquitination, it must be controlled in time and space by a still unknown trigger. In this study, we tested the hypothesis that the profile and extent of protein carbonylation are influenced by iron homeostasis in vivo. For this, we compared the profile and the contents of the carbonylated proteins in the Arabidopsis thaliana wild-type and mutant-deficient in three ferritin genes under normal and stress conditions. Additionally, we examined the proteins specifically carbonylated in wild-type seedlings exposed to iron-deficient conditions. Our results indicated that proteins were differentially carbonylated between the wild type and the triple ferritin mutant Fer1-3-4 in the leaves, stems, and flowers under normal growth conditions. The profile of the carbonylated proteins was also different between the wild type and the ferritin triple mutant exposed to heat stress, thus pointing to the influence of iron on the carbonylation of proteins. Consistent with this, the exposure of the seedlings to iron deficiency and iron excess greatly influenced the carbonylation of certain proteins involved in intracellular signal transduction, translation, and iron deficiency response. Overall, the study underlined the importance of iron homeostasis in the occurrence of protein carbonylation in vivo. [ABSTRACT FROM AUTHOR]

Published
2023
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10. ALDH7B4 gene overexpression alleviates the effects induced by amino acid biosynthesis-inhibiting herbicides

Author

Gil Monreal, Miriam, Zabalza Aznárez, Ana, Missihoun, Tagnon D., Bartels, Dorothea, Royuela Hernando, Mercedes, Universidad Pública de Navarra. Departamento de Ciencias del Medio Natural, Nafarroako Unibertsitate Publikoa. Natura Ingurunearen Zienziak Saila, and Universidad Pública de Navarra / Nafarroako Unibertsitate Publikoa

Subjects
Glyphosate, Imazamox, Peroxidación lipídica, Arabidopsis thaliana, Carbohidratos, Glifosato, Lipid peroxidation, Carbohydrates
Abstract

Comunicación presentada al XVI Congreso de la Sociedad Española de Malherbología, celebrado en la Universidad Pública de Navarra, Pamplona-Iruña, entre los días 25 y 27 de octubre de 2017. En este trabajo se ha profundizado en el conocimiento de los efectos fisiológicos provocados por los herbicidas imazamox y glifosato. En concreto, se ha estudiado el papel de la ALDH7B4, aldehído deshidrogenasa, que contribuye a la tolerancia de las plantas a diversos estreses. Se cultivaron plantas de Arabidopsis thaliana silvestres y plantas que sobreexpresan el gen ALDH7B4, que fueron tratadas con dosis comparables de imazamox o glifosato. Se observó que ambos genotipos presentan valores similares de malondialdehído, indicando que la ALDH7B4 no participa en la detoxificación de aldehídos derivados de la peroxidación lipídica. Por otro lado, se monitorizaron los principales efectos fisiológicos provocados por este tipo de herbicidas y se observó que los efectos de los herbicidas (contenido en carbohidratos y crecimiento) se atenúan en las plantas mutantes, indicando que la ALDH7B4 contribuye a aliviar los efectos provocados por estos herbicidas. The present work focuses on the effects provoked by the amino acid biosynthesis-inhibiting herbicides in plants. We evaluated the role of the ALDH7B4, one aldehyde dehydrogenase that contributes to different stress tolerance. Wild-type Arabidopsis thaliana plants and mutants overexpressing the ALDH7B4 gene were grown and treated with imazamox or glyphosate. Similar levels of malondialdehyde were observed in both studied mutants, indicating that the ALDH7B4 is not involved in the detoxification of the aldehydes derived from lipid peroxidation in plants treated with herbicides. Additionally, the main physiological effects provoked by this type of herbicides were monitored. The results shown that the effects of herbicides on the carbohydrate content and growth of plants were alleviated on plants overexpressing the ALDH7B4 gene, suggesting that the ALDH7B4 contributes to the tolerance of the stress provoked by these herbicides. La investigación presentada ha sido financiada por el proyecto AGL2013-40567R. Miriam Gil-Monreal ha recibido una beca predoctoral y una beca de movilidad de la Universidad Pública de Navarra .

Published
2017

11. La sobreexpresión del gen ALDH7B4 alivia los efectos provocados por herbicidas inhibidores de la biosíntesis de aminoácidos

Author

Gil Monreal, Miriam, Zabalza Aznárez, Ana, Missihoun, Tagnon D., Bartels, Dorothea, Royuela Hernando, Mercedes, Universidad Pública de Navarra. Departamento de Ciencias del Medio Natural, Nafarroako Unibertsitate Publikoa. Natura Ingurunearen Zienziak Saila, and Universidad Pública de Navarra / Nafarroako Unibertsitate Publikoa

Subjects
Glyphosate, Imazamox, Peroxidación lipídica, Arabidopsis thaliana, Carbohidratos, Glifosato, Lipid peroxidation, Carbohydrates
Abstract

Comunicación presentada al XVI Congreso de la Sociedad Española de Malherbología, celebrado en la Universidad Pública de Navarra, Pamplona-Iruña, entre los días 25 y 27 de octubre de 2017. En este trabajo se ha profundizado en el conocimiento de los efectos fisiológicos provocados por los herbicidas imazamox y glifosato. En concreto, se ha estudiado el papel de la ALDH7B4, aldehído deshidrogenasa, que contribuye a la tolerancia de las plantas a diversos estreses. Se cultivaron plantas de Arabidopsis thaliana silvestres y plantas que sobreexpresan el gen ALDH7B4, que fueron tratadas con dosis comparables de imazamox o glifosato. Se observó que ambos genotipos presentan valores similares de malondialdehído, indicando que la ALDH7B4 no participa en la detoxificación de aldehídos derivados de la peroxidación lipídica. Por otro lado, se monitorizaron los principales efectos fisiológicos provocados por este tipo de herbicidas y se observó que los efectos de los herbicidas (contenido en carbohidratos y crecimiento) se atenúan en las plantas mutantes, indicando que la ALDH7B4 contribuye a aliviar los efectos provocados por estos herbicidas. The present work focuses on the effects provoked by the amino acid biosynthesis-inhibiting herbicides in plants. We evaluated the role of the ALDH7B4, one aldehyde dehydrogenase that contributes to different stress tolerance. Wild-type Arabidopsis thaliana plants and mutants overexpressing the ALDH7B4 gene were grown and treated with imazamox or glyphosate. Similar levels of malondialdehyde were observed in both studied mutants, indicating that the ALDH7B4 is not involved in the detoxification of the aldehydes derived from lipid peroxidation in plants treated with herbicides. Additionally, the main physiological effects provoked by this type of herbicides were monitored. The results shown that the effects of herbicides on the carbohydrate content and growth of plants were alleviated on plants overexpressing the ALDH7B4 gene, suggesting that the ALDH7B4 contributes to the tolerance of the stress provoked by these herbicides. La investigación presentada ha sido financiada por el proyecto AGL2013-40567R. Miriam Gil-Monreal ha recibido una beca predoctoral y una beca de movilidad de la Universidad Pública de Navarra .

Published
2017

17. The role of Arabidopsis aldehyde dehydrogenase genes in response to high temperature and stress combinations.

Author

Junyi Zhao, Missihoun, Tagnon D., and Bartels, Dorothea

Subjects
*ALDEHYDE dehydrogenase genetics, *ARABIDOPSIS, *EFFECT of heat on plants, *EFFECT of stress on plants, *OXIDATION-reduction reaction
Abstract

Aldehyde dehydrogenases (ALDH) are a family of enzymes that are involved in plant metabolism and contribute to aldehyde homeostasis to eliminate toxic aldehydes. The ALDH enzymes produce NADPH and NADH in their enzymatic reactions and thus contribute to balancing redox equivalents. Previous studies showed that Arabidopsis ALDH genes are expressed in response to high salinity, dehydration, oxidative stress, or heavy metals, suggesting important roles in environmental adaptation. However, the role of ALDH genes in high temperature and stress combinations (heat stress combined with dehydration, wounding, or salt stress) is unclear. Here, we analysed expression patterns of selected ALDH genes on the transcript and protein level at different time points of heat stress, basal and acquired thermotolerance, and stress combination treatments. Our results indicate that ALDH3I1 and ALDH7B4 are strongly induced by heat stress. Higher levels of ALDH7B4 accumulated in response to dehydration-heat, heat-salt and wounding-heat combination stress than in response to single stressors. The comparison of physiological and biological parameters in T-DNA double mutants of ALDH genes and wild-type plants demonstrated that mutant lines are more sensitive to heat stress and stress combinations than wild-type plants. [ABSTRACT FROM AUTHOR]

Published
2017
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18. Recent Development on Plant Aldehyde Dehydrogenase Enzymes and Their Functions in Plant Development and Stress Signaling.

Author

Tola, Adesola J., Jaballi, Amal, Germain, Hugo, and Missihoun, Tagnon D.

Subjects
PLANT enzymes, ALDEHYDE dehydrogenase, PLANT development, AROMATIC aldehydes, ENZYME metabolism, ABIOTIC stress
Abstract

Abiotic and biotic stresses induce the formation of reactive oxygen species (ROS), which subsequently causes the excessive accumulation of aldehydes in cells. Stress-derived aldehydes are commonly designated as reactive electrophile species (RES) as a result of the presence of an electrophilic α, β-unsaturated carbonyl group. Aldehyde dehydrogenases (ALDHs) are NAD(P)+-dependent enzymes that metabolize a wide range of endogenous and exogenous aliphatic and aromatic aldehyde molecules by oxidizing them to their corresponding carboxylic acids. The ALDH enzymes are found in nearly all organisms, and plants contain fourteen ALDH protein families. In this review, we performed a critical analysis of the research reports over the last decade on plant ALDHs. Newly discovered roles for these enzymes in metabolism, signaling and development have been highlighted and discussed. We concluded with suggestions for future investigations to exploit the potential of these enzymes in biotechnology and to improve our current knowledge about these enzymes in gene signaling and plant development. [ABSTRACT FROM AUTHOR]

Published
2021
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