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Auxin regulates endosperm cellularization in Arabidopsis
- The endosperm is an ephemeral tissue that nourishes the developing embryo, similar to the placenta in mammals. In most angiosperms, endosperm development starts as a syncytium, in which nuclear divisions are not followed by cytokinesis. The timing of endosperm cellularization largely varies between species, and the event triggering this transition remains unknown. Here we show that increased auxin biosynthesis in the endosperm prevents its cellularization, leading to seed arrest. Auxin-overproducing seeds phenocopy paternal-excess triploid seeds derived from hybridizations of diploid maternal plants with tetraploid fathers. Concurrently, auxin-related genes are strongly overexpressed in triploid seeds, correlating with increased auxin activity. Reducing auxin biosynthesis and signaling reestablishes endosperm cellularization in triploid seeds and restores their viability, highlighting a causal role of increased auxin in preventing endosperm cellularization. We propose that auxin determines the time of endosperm cellularization, andThe endosperm is an ephemeral tissue that nourishes the developing embryo, similar to the placenta in mammals. In most angiosperms, endosperm development starts as a syncytium, in which nuclear divisions are not followed by cytokinesis. The timing of endosperm cellularization largely varies between species, and the event triggering this transition remains unknown. Here we show that increased auxin biosynthesis in the endosperm prevents its cellularization, leading to seed arrest. Auxin-overproducing seeds phenocopy paternal-excess triploid seeds derived from hybridizations of diploid maternal plants with tetraploid fathers. Concurrently, auxin-related genes are strongly overexpressed in triploid seeds, correlating with increased auxin activity. Reducing auxin biosynthesis and signaling reestablishes endosperm cellularization in triploid seeds and restores their viability, highlighting a causal role of increased auxin in preventing endosperm cellularization. We propose that auxin determines the time of endosperm cellularization, and thereby uncovered a central role of auxin in establishing hybridization barriers in plants.…
Verfasserangaben: | Rita A. Batista, Duarte Dionisio FigueiredoORCiDGND, Juan Santos-Gonzalez, Claudia KöhlerORCiD |
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DOI: | https://doi.org/10.1101/gad.316554.118 |
ISSN: | 0890-9369 |
ISSN: | 1549-5477 |
Pubmed ID: | https://pubmed.ncbi.nlm.nih.gov/30819818 |
Titel des übergeordneten Werks (Englisch): | Genes & Development |
Verlag: | Cold Spring Harbor Laboratory Press |
Verlagsort: | Cold Spring Harbor, NY |
Publikationstyp: | Wissenschaftlicher Artikel |
Sprache: | Englisch |
Datum der Erstveröffentlichung: | 28.02.2019 |
Erscheinungsjahr: | 2019 |
Datum der Freischaltung: | 10.03.2021 |
Freies Schlagwort / Tag: | auxin; cellularization; endosperm; hybridization barrier; seed development; triploid block |
Band: | 33 |
Ausgabe: | 7-8 |
Seitenanzahl: | 11 |
Erste Seite: | 466 |
Letzte Seite: | 476 |
Organisationseinheiten: | Mathematisch-Naturwissenschaftliche Fakultät / Institut für Biochemie und Biologie |
DDC-Klassifikation: | 5 Naturwissenschaften und Mathematik / 57 Biowissenschaften; Biologie / 570 Biowissenschaften; Biologie |
Peer Review: | Referiert |
Publikationsweg: | Open Access / Gold Open-Access |
Lizenz (Deutsch): | ![]() |