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21 results on '"Avramova, Viktoriya"'

3. P06-040-23 The Proteomes That Feed the World

Author

Piller, Andrea, primary, Brajkovic, Sarah, additional, Abbas, Qussai, additional, Andrade-Galan, Paula, additional, Aydin, Ezgi, additional, Corongiu, Gianluca, additional, Giordano, Guido, additional, Haljiti, Genc, additional, Hein, Sophia, additional, Pan, Jiuyue, additional, Picciani, Mario, additional, Röhrl, Patrick, additional, Ramirez, Veronica, additional, Saylan, Cemil Can, additional, Soleymaniniya, Armin, additional, Urzinger, Sebastian, additional, Würstl, Lukas, additional, Avramova, Viktoriya, additional, Dawid, Corinna, additional, Frishman, Dimitrij, additional, Gutjahr, Caroline, additional, Hückelhoven, Ralph, additional, Ludwig, Christina, additional, Pauling, Josch, additional, Schön, Chris-Carolin, additional, Schwechheimer, Claus, additional, Wilhelm, Mathias, additional, Wilhelm, Stephanie, additional, Poppenberger, Brigitte, additional, and Kuster, Bernhard, additional

Published
2023
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4. The Proteomes that Feed the World

Author

Piller, Andrea, primary, Brajkovic, Sarah, additional, Abbas, Qussai, additional, Andrade‐Galan, Paula, additional, Aydin, Ezgi, additional, Corongiu, Gianluca, additional, Giordano, Guido, additional, Haljiti, Genc, additional, Hein, Sophia, additional, Pan, Jiuyue, additional, Picciani, Mario, additional, Ramirez, Veronica, additional, Röhrl, Patrick, additional, Saylan, Cemil Can, additional, Soleymaniniya, Armin, additional, Urzinger, Sebastian, additional, Würstl, Lukas, additional, Avramova, Viktoriya, additional, Dawid, Corinna, additional, Frishman, Dmitrij, additional, Gutjahr, Caroline, additional, Hückelhoven, Ralph, additional, Ludwig, Christina, additional, Pauling, Josch, additional, Schön, Chris‐Carolin, additional, Schwechheimer, Claus, additional, Wilhelm, Mathias, additional, Wilhelm, Stephanie, additional, Poppenberger, Brigitte, additional, and Küster, Bernhard, additional

Published
2023
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6. B2O3 nanoparticles alleviate salt stress in maize leaf growth zones by enhancing photosynthesis and maintaining mineral and redox status.

Author

El‐Shafey, Nadia Mohamed, Avramova, Viktoriya, Beemster, Gerrit T. S., Korany, Shereen Magdy, and AbdElgawad, Hamada

Abstract

Salt stress induces significant loss in crop yield worldwide. Although the growth‐stimulating effects of micronutrient nanoparticles (NPs) application under salinity have been studied, the molecular and biochemical mechanisms underlying these effects are poorly understood. The large size of maize leaf growth zones provides an ideal model system to sample and investigate the molecular and physiological bases of growth at subzonal resolution. Using kinematic analysis, our study indicated that salinity at 150 mM inhibited maize leaf growth by decreasing cell division and expansion in the meristem and elongation zones. Consistently, salinity downregulated cell cycle gene expression (wee1, mcm4, and cyclin‐B2‐4). B2O3 NP (BNP) mitigated the stress‐induced growth inhibition by reducing the decrease in cell division and expansion. BNP also enhanced the photosynthesis‐related parameters. Simultaneously, chlorophyll, phosphoenolpyruvate carboxylase and ribulose‐1,5‐bisphosphate carboxylase/oxygenase were stimulated in the mature zone. Concomitant with growth stimulation by BNP, mineral homeostasis, particularly for B and Ca, was monitored. BNP reduced oxidative stress (e.g., lessened H2O2 generation along the leaf zones and reduced lipid peroxidation in the mature zone) induced by salinity. This resulted from better maintenance of the redox status, that is, increased the glutathione‐ascorbate cycle in the meristem and elongation zones, and flavonoids and tocopherol levels in the mature zone. Our study has important implications for assessing the salinity stress impact mitigated by BNP on maize growth, providing a basis to improve the resilience of crop species under salinity stress conditions. [ABSTRACT FROM AUTHOR]

Published
2023
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8. Natural alleles of the abscisic acid catabolism gene ZmAbh4 modulate water use efficiency and carbon isotope discrimination in maize

Author

Blankenagel, Sonja, primary, Eggels, Stella, additional, Frey, Monika, additional, Grill, Erwin, additional, Bauer, Eva, additional, Dawid, Corinna, additional, Fernie, Alisdair R, additional, Haberer, Georg, additional, Hammerl, Richard, additional, Barbosa Medeiros, David, additional, Ouzunova, Milena, additional, Presterl, Thomas, additional, Ruß, Victoria, additional, Schäufele, Rudi, additional, Schlüter, Urte, additional, Tardieu, Francois, additional, Urbany, Claude, additional, Urzinger, Sebastian, additional, Weber, Andreas P M, additional, Schön, Chris-Carolin, additional, and Avramova, Viktoriya, additional

Published
2022
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9. Natural alleles of the abscisic acid catabolism gene ZmAbh4 modulate water use efficiency and carbon isotope discrimination in maize

Author

Blankenagel, Sonja, Eggels, Stella, Frey, Monika, Grill, Erwin, Bauer, Eva, Dawid, Corinna, Fernie, Alisdair R., Haberer, Georg, Hammerl, Richard, Barbosa Medeiros, David, Ouzunova, Milena, Presterl, Thomas, Russ, Victoria, Schaeufele, Rudi, Schlueter, Urte, Tardieu, Francois, Urbany, Claude, Urzinger, Sebastian, Weber, Andreas P. M., Schoen, Chris-Carolin, Avramova, Viktoriya, Blankenagel, Sonja, Eggels, Stella, Frey, Monika, Grill, Erwin, Bauer, Eva, Dawid, Corinna, Fernie, Alisdair R., Haberer, Georg, Hammerl, Richard, Barbosa Medeiros, David, Ouzunova, Milena, Presterl, Thomas, Russ, Victoria, Schaeufele, Rudi, Schlueter, Urte, Tardieu, Francois, Urbany, Claude, Urzinger, Sebastian, Weber, Andreas P. M., Schoen, Chris-Carolin, and Avramova, Viktoriya

Abstract

Altering plant water use efficiency (WUE) is a promising approach for achieving sustainable crop production in changing climate scenarios. Here, we show that WUE can be tuned by alleles of a single gene discovered in elite maize (Zea mays) breeding material. Genetic dissection of a genomic region affecting WUE led to the identification of the gene ZmAbh4 as causative for the effect. CRISPR/Cas9-mediated ZmAbh4 inactivation increased WUE without growth reductions in well-watered conditions. ZmAbh4 encodes an enzyme that hydroxylates the phytohormone abscisic acid (ABA) and initiates its catabolism. Stomatal conductance is regulated by ABA and emerged as a major link between variation in WUE and discrimination against the heavy carbon isotope (Delta C-13) during photosynthesis in the C-4 crop maize. Changes in Delta C-13 persisted in kernel material, which offers an easy-to-screen proxy for WUE. Our results establish a direct physiological and genetic link between WUE and Delta C-13 through a single gene with potential applications in maize breeding. Forward and reverse genetics identified the abscisic acid catabolism gene ZmAbh4 as a major link between variation in water use efficiency and carbon isotope discrimination through the control of stomatal conductance.

Published
2022

10. Starch biosynthesis contributes to the maintenance of photosynthesis and leaf growth under drought stress in maize

Author

AbdElgawad, Hamada, primary, Avramova, Viktoriya, additional, Baggerman, Geert, additional, Van Raemdonck, Geert, additional, Valkenborg, Dirk, additional, Van Ostade, Xaveer, additional, Guisez, Yves, additional, Prinsen, Els, additional, Asard, Han, additional, Van den Ende, Wim, additional, and Beemster, Gerrit T. S., additional

Published
2020
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12. Carbon isotope composition, water use efficiency, and drought sensitivity are controlled by a common genomic segment in maize

Author

Avramova, Viktoriya, primary, Meziane, Adel, additional, Bauer, Eva, additional, Blankenagel, Sonja, additional, Eggels, Stella, additional, Gresset, Sebastian, additional, Grill, Erwin, additional, Niculaes, Claudiu, additional, Ouzunova, Milena, additional, Poppenberger, Brigitte, additional, Presterl, Thomas, additional, Rozhon, Wilfried, additional, Welcker, Claude, additional, Yang, Zhenyu, additional, Tardieu, François, additional, and Schön, Chris-Carolin, additional

Published
2018
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16. Kinematic analysis of cell division and expansion : quantifying the cellular basis of growth and sampling developmental zones in **Zea mays** leaves

Author

Sprangers, Katrien, Avramova, Viktoriya, and Beemster, Gerrit

Subjects
Biology, Engineering sciences. Technology
Abstract

Growth analyses are often used in plant science to investigate contrasting genotypes and the effect of environmental conditions. The cellular aspect of these analyses is of crucial importance, because growth is driven by cell division and cell elongation. Kinematic analysis represents a methodology to quantify these two processes. Moreover, this technique is easy to use in non-specialized laboratories. Here, we present a protocol for performing a kinematic analysis in monocotyledonous maize (Zea mays) leaves. Two aspects are presented: (1) the quantification of cell division and expansion parameters, and (2) the determination of the location of the developmental zones. This could serve as a basis for sampling design and/or could be useful for data interpretation of biochemical and molecular measurements with high spatial resolution in the leaf growth zone. The growth zone of maize leaves is harvested during steady-state growth. Individual leaves are used for meristem length determination using a DAPI stain and cell-length profiles using DIC microscopy. The protocol is suited for emerged monocotyledonous leaves harvested during steady-state growth, with growth zones spanning at least several centimeters. To improve the understanding of plant growth regulation, data on growth and molecular studies must be combined. Therefore, an important advantage of kinematic analysis is the possibility to correlate changes at the molecular level to well-defined stages of cellular development. Furthermore, it allows for a more focused sampling of specified developmental stages, which is useful in case of limited budget or time.

Published
2016

21. B 2 O 3 nanoparticles alleviate salt stress in maize leaf growth zones by enhancing photosynthesis and maintaining mineral and redox status.

Author

El-Shafey NM, Avramova V, Beemster GTS, Korany SM, and AbdElgawad H

Subjects
Plant Leaves metabolism, Oxidation-Reduction, Salt Stress, Minerals metabolism, Salinity, Zea mays genetics, Photosynthesis
Abstract

Salt stress induces significant loss in crop yield worldwide. Although the growth-stimulating effects of micronutrient nanoparticles (NPs) application under salinity have been studied, the molecular and biochemical mechanisms underlying these effects are poorly understood. The large size of maize leaf growth zones provides an ideal model system to sample and investigate the molecular and physiological bases of growth at subzonal resolution. Using kinematic analysis, our study indicated that salinity at 150 mM inhibited maize leaf growth by decreasing cell division and expansion in the meristem and elongation zones. Consistently, salinity downregulated cell cycle gene expression (wee1, mcm4, and cyclin-B2-4). B 2 O 3 NP (BNP) mitigated the stress-induced growth inhibition by reducing the decrease in cell division and expansion. BNP also enhanced the photosynthesis-related parameters. Simultaneously, chlorophyll, phosphoenolpyruvate carboxylase and ribulose-1,5-bisphosphate carboxylase/oxygenase were stimulated in the mature zone. Concomitant with growth stimulation by BNP, mineral homeostasis, particularly for B and Ca, was monitored. BNP reduced oxidative stress (e.g., lessened H 2 O 2 generation along the leaf zones and reduced lipid peroxidation in the mature zone) induced by salinity. This resulted from better maintenance of the redox status, that is, increased the glutathione-ascorbate cycle in the meristem and elongation zones, and flavonoids and tocopherol levels in the mature zone. Our study has important implications for assessing the salinity stress impact mitigated by BNP on maize growth, providing a basis to improve the resilience of crop species under salinity stress conditions., (© 2023 Scandinavian Plant Physiology Society.)

Published
2023
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