Dual and opposing roles of EIN3 reveal a generation conflict during seed growth
| Autor: | Juliane Heydlauff, Rita Groß-Hardt, Thomas Nakel, Theresa Harten, Isil Erbasol Serbes, Anja Hoffmann, Dieu Vo, Sonja Gieseking, Yanbo Mao, Ronny Völz |
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| Rok vydání: | 2021 |
| Předmět: |
0106 biological sciences
Ethylene Mutant Arabidopsis Plant Science Biology 01 natural sciences Endosperm 03 medical and health sciences chemistry.chemical_compound Gene Expression Regulation Plant Ethylene biosynthesis Molecular Biology Transcription factor 030304 developmental biology 2. Zero hunger 0303 health sciences Arabidopsis Proteins food and beverages Nuclear Proteins Ethylenes Cell biology DNA-Binding Proteins Plant Breeding chemistry Seeds Grain yield Function (biology) 010606 plant biology & botany |
| Zdroj: | Molecular Plant |
| ISSN: | 1752-9867 |
| Popis: | Seed size critically affects grain yield of crops and hence represents a key breeding target. The development of embryo-nourishing endosperm is a key driver of seed expansion. We here report unexpected dual roles of the transcription factor EIN3 in regulating seed size. These EIN3 functions have remained largely undiscovered because they oppose each other. Capitalizing on the analysis of multiple ethylene biosynthesis mutants, we demonstrate that EIN3 represses endosperm and seed development in a pathway regulated by ethylene. We, in addition, provide evidence that EIN3-mediated synergid nuclei disintegration promotes endosperm expansion. Interestingly, synergid nuclei disintegration is not affected in various ethylene biosynthesis mutants, suggesting that this promoting function of EIN3 is independent of ethylene. Whereas the growth-inhibitory ethylene-dependent EIN3 action appears to be encoded by sporophytic tissue, the growth-promoting role of EIN3 is induced by fertilization, revealing a generation conflict that converges towards the key signaling component EIN3. |
| Databáze: | OpenAIRE |
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