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Wilmowicz E, Kućko A, Tranbarger TJ, Ostrowski M, Niedojadło J, Karwaszewski J, Kapuścińska D, Panek K. EPIP as an abscission promoting agent in the phytohormonal pathway. Plant Physiol Biochem 2022; 178:137-145. [PMID: 35298945 DOI: 10.1016/j.plaphy.2022.03.008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/30/2021] [Revised: 03/01/2022] [Accepted: 03/08/2022] [Indexed: 06/14/2023]
Abstract
Understanding the mechanisms underlying the activation of the abscission zone (AZ) responsible for organ separation from plant body in crop species will help improve their yielding and economic importance. Special attention has been given recently to the role of the INFLORESCENCE DEFICIENT IN ABSCISSION protein, particularly its functional fragment, EPIP peptide. Its stimulatory effect on abscission in different crops has been demonstrated. Recently we described the role of EPIP in the redox, lipid, and pectin-related events taking place in AZ of Lupinus luteus flowers, which undergo massive abscission in natural conditions. To further examine EPIP contribution in AZ functioning, here, we analyze its impact on the ultrastructural changes, synthesis of two hormonal abscission stimulators - abscisic acid (ABA) and ethylene (ET), and the appearance of phosphoproteins. As our results show, the response of flower AZ to exogenous EPIP involves the induction of distinct modifications related to the one hand with upregulation of cell activity but on the other hand degradation processes and possible autophagy. Furthermore, the EPIP stimulated biosynthesis pathways of ABA and ET precisely in AZ cells. In addition, progressive phosphorylation of proteins has been observed under EPIP influence. The highly accumulated ones were identified as those, related to primary metabolism and reactive oxygen species homeostasis, and their role in abscission has been discussed. To summarizing, the presented detailed description of EPIP action in AZ cells in combination with our previous data offers new insights into its regulatory function and provides opportunities to counteract excessive flower abscission in lupine.
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Affiliation(s)
- Emilia Wilmowicz
- Department of Plant Physiology and Biotechnology, Nicolaus Copernicus University, 1 Lwowska Street, 87-100, Torun, Poland.
| | - Agata Kućko
- Department of Plant Physiology, Institute of Biology, Warsaw University of Life Sciences-SGGW (WULS-SGGW), Nowoursynowska 159 Street, 02-776, Warsaw, Poland
| | - Timothy John Tranbarger
- UMR DIADE, IRD Centre de Montpellier, Institut de Recherche pour le Développement, Université de Montpellier, 911 Avenue Agropolis BP 64501, 34394, CEDEX 5 Montpellier, France
| | - Maciej Ostrowski
- Department of Biochemistry, Nicolaus Copernicus University, Lwowska 1, 87-100, Torun, Poland
| | - Janusz Niedojadło
- Department of Cellular and Molecular Biology, Nicolaus Copernicus University, Lwowska 1, 87-100, Torun, Poland
| | - Jacek Karwaszewski
- Department of Plant Physiology and Biotechnology, Nicolaus Copernicus University, 1 Lwowska Street, 87-100, Torun, Poland
| | - Dominika Kapuścińska
- Chair of Plant Physiology and Biotechnology, University of Gdańsk, 59 Wita Stwosza, 80-308, Gdańsk, Poland
| | - Katarzyna Panek
- Department of Plant Physiology and Biotechnology, Nicolaus Copernicus University, 1 Lwowska Street, 87-100, Torun, Poland
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