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A change in the cell wall status initiates the elimination of the nucellus in Arabidopsis.

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Title: A change in the cell wall status initiates the elimination of the nucellus in Arabidopsis.
Authors: Iannaccone, Miryam1, Xu, Wenjia1 wenjia.xu@inrae.fr, Gomez-Paez, Dennys-Marcela1, Choinard, Sandrine1, Maricchiolo, Elisa2, Peaucelle, Alexis1, Voxeur, Aline1, Haas, Kalina Tamara1, Lapierre, Catherine1, Jiménez-Gómez, Jose M.3, Pompa, Andrea2, Magnani, Enrico1 enrico.magnani@inrae.fr
Source: Proceedings of the National Academy of Sciences of the United States of America. 5/12/2026, Vol. 123 Issue 19, p1-11. 11p.
Subjects: Arabidopsis, Seed development, Polysaccharides, Plant cell walls, Ovules, Cell death, Transcription factors
Abstract: The evolution of the seed habit can be traced back to a change in the cell fate of the nucellus, the sporophytic tissue responsible for female meiosis. Seeds arose when the nucellus retained the female spores instead of releasing them into the environment. As a consequence, the nucellus was partially eliminated to accommodate the growth of the female gametophyte inside the sporophyte. With the evolution of angiosperm seeds, the process of nucellus elimination was requisitioned to allow the growth of the endosperm, the fertilization product devoted to storing nutrients that are at the foundation of the human diet. Cell elimination differs from most known cell death programs as it leads to the apparent dismantling of the cell wall. Here, we show that nucellus elimination in Arabidopsis is initiated by demethylesterification and subsequent lysis of the pectic polysaccharides in the cell wall. This process exposes other cell wall components to possible further degradation and precedes a cell death program that leads to nuclear DNA fragmentation. Both pathways are regulated by TRANSPARENT TESTA 16, a MADS-domain transcription factor that evolved with seed plants. Our results highlight a convergence in the structure and function of extracellular polysaccharides in animals and plants and emphasize their crucial contribution to the development of multicellular organisms. [ABSTRACT FROM AUTHOR]
Copyright of Proceedings of the National Academy of Sciences of the United States of America is the property of National Academy of Sciences and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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Header DbId: egs
DbLabel: Engineering Source
An: 193988600
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
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  Data: A change in the cell wall status initiates the elimination of the nucellus in Arabidopsis.
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  Data: <searchLink fieldCode="AR" term="%22Iannaccone%2C+Miryam%22">Iannaccone, Miryam</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Xu%2C+Wenjia%22">Xu, Wenjia</searchLink><relatesTo>1</relatesTo><i> wenjia.xu@inrae.fr</i><br /><searchLink fieldCode="AR" term="%22Gomez-Paez%2C+Dennys-Marcela%22">Gomez-Paez, Dennys-Marcela</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Choinard%2C+Sandrine%22">Choinard, Sandrine</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Maricchiolo%2C+Elisa%22">Maricchiolo, Elisa</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Peaucelle%2C+Alexis%22">Peaucelle, Alexis</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Voxeur%2C+Aline%22">Voxeur, Aline</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Haas%2C+Kalina+Tamara%22">Haas, Kalina Tamara</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Lapierre%2C+Catherine%22">Lapierre, Catherine</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Jiménez-Gómez%2C+Jose+M%2E%22">Jiménez-Gómez, Jose M.</searchLink><relatesTo>3</relatesTo><br /><searchLink fieldCode="AR" term="%22Pompa%2C+Andrea%22">Pompa, Andrea</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Magnani%2C+Enrico%22">Magnani, Enrico</searchLink><relatesTo>1</relatesTo><i> enrico.magnani@inrae.fr</i>
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  Data: <searchLink fieldCode="DE" term="%22Arabidopsis%22">Arabidopsis</searchLink><br /><searchLink fieldCode="DE" term="%22Seed+development%22">Seed development</searchLink><br /><searchLink fieldCode="DE" term="%22Polysaccharides%22">Polysaccharides</searchLink><br /><searchLink fieldCode="DE" term="%22Plant+cell+walls%22">Plant cell walls</searchLink><br /><searchLink fieldCode="DE" term="%22Ovules%22">Ovules</searchLink><br /><searchLink fieldCode="DE" term="%22Cell+death%22">Cell death</searchLink><br /><searchLink fieldCode="DE" term="%22Transcription+factors%22">Transcription factors</searchLink>
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  Data: The evolution of the seed habit can be traced back to a change in the cell fate of the nucellus, the sporophytic tissue responsible for female meiosis. Seeds arose when the nucellus retained the female spores instead of releasing them into the environment. As a consequence, the nucellus was partially eliminated to accommodate the growth of the female gametophyte inside the sporophyte. With the evolution of angiosperm seeds, the process of nucellus elimination was requisitioned to allow the growth of the endosperm, the fertilization product devoted to storing nutrients that are at the foundation of the human diet. Cell elimination differs from most known cell death programs as it leads to the apparent dismantling of the cell wall. Here, we show that nucellus elimination in Arabidopsis is initiated by demethylesterification and subsequent lysis of the pectic polysaccharides in the cell wall. This process exposes other cell wall components to possible further degradation and precedes a cell death program that leads to nuclear DNA fragmentation. Both pathways are regulated by TRANSPARENT TESTA 16, a MADS-domain transcription factor that evolved with seed plants. Our results highlight a convergence in the structure and function of extracellular polysaccharides in animals and plants and emphasize their crucial contribution to the development of multicellular organisms. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Proceedings of the National Academy of Sciences of the United States of America is the property of National Academy of Sciences and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1073/pnas.2515702123
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      – Code: eng
        Text: English
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        PageCount: 11
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      – SubjectFull: Arabidopsis
        Type: general
      – SubjectFull: Seed development
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      – SubjectFull: Polysaccharides
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      – SubjectFull: Plant cell walls
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      – SubjectFull: Ovules
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      – SubjectFull: Cell death
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      – SubjectFull: Transcription factors
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              Text: 5/12/2026
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