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The abundance of pollen coat small signaling proteins shows limited convergence between independent selfing transitions in Arabidopsis and Capsella.

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Title: The abundance of pollen coat small signaling proteins shows limited convergence between independent selfing transitions in Arabidopsis and Capsella.
Authors: İltaş, Ömer1,2 (AUTHOR), Salomon, Luciana1 (AUTHOR), Kovačik, Martin1,3 (AUTHOR), Čertner, Martin1,4 (AUTHOR), Talacko, Pavel5 (AUTHOR), Harant, Karel5 (AUTHOR), Hafidh, Said6 (AUTHOR), Lafon Placette, Clément1 (AUTHOR) lafonplc@natur.cuni.cz
Source: New Phytologist. Jun2026, Vol. 250 Issue 5, p3460-3474. 15p.
Subjects: Self-pollination, Convergent evolution, Plant proteomics, Plant reproduction, Pollen, Arabidopsis
Abstract: Summary: In plants, a key example of convergence is the repeated evolution of floral traits associated with the transition from outcrossing to self‐fertilization, often resulting in the 'selfing syndrome' (e.g. reduced flower size and loss of scent). However, potentially overlooked changes concern the pollen coat, which plays a role in different aspects of outcrossing strategy.To investigate this, we compared pollen coat thickness and pollen proteomes between selfing and outcrossing species in the Arabidopsis and Capsella genera, representing three independent selfing transitions.Pollen coat area diminished with the age of the selfing transition, with significant reductions in A. thaliana and Capsella rubella, but not in A. lyrata (recent transition, no selfing syndrome). Moreover, specific differentially abundant pollen coat proteins were shared across selfer–outcrosser contrasts more than expected by chance, even though the direction of changes was not consistent across the three comparisons. These specific proteins, while annotated as pathogen response due to their structure, are likely involved in pollen–pistil interactions instead.Overall, our findings reveal limited convergent evolution of pollen coat thickness and protein composition following selfing transitions. Our work identified a group of pollen coat proteins that are largely understudied, but whose abundance appears to be a hotspot for evolutionary changes. [ABSTRACT FROM AUTHOR]
Copyright of New Phytologist is the property of Wiley-Blackwell 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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DbLabel: Engineering Source
An: 193599668
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
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  Data: The abundance of pollen coat small signaling proteins shows limited convergence between independent selfing transitions in Arabidopsis and Capsella.
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  Data: <searchLink fieldCode="JN" term="%22New+Phytologist%22">New Phytologist</searchLink>. Jun2026, Vol. 250 Issue 5, p3460-3474. 15p.
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  Data: <searchLink fieldCode="DE" term="%22Self-pollination%22">Self-pollination</searchLink><br /><searchLink fieldCode="DE" term="%22Convergent+evolution%22">Convergent evolution</searchLink><br /><searchLink fieldCode="DE" term="%22Plant+proteomics%22">Plant proteomics</searchLink><br /><searchLink fieldCode="DE" term="%22Plant+reproduction%22">Plant reproduction</searchLink><br /><searchLink fieldCode="DE" term="%22Pollen%22">Pollen</searchLink><br /><searchLink fieldCode="DE" term="%22Arabidopsis%22">Arabidopsis</searchLink>
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  Data: Summary: In plants, a key example of convergence is the repeated evolution of floral traits associated with the transition from outcrossing to self‐fertilization, often resulting in the 'selfing syndrome' (e.g. reduced flower size and loss of scent). However, potentially overlooked changes concern the pollen coat, which plays a role in different aspects of outcrossing strategy.To investigate this, we compared pollen coat thickness and pollen proteomes between selfing and outcrossing species in the Arabidopsis and Capsella genera, representing three independent selfing transitions.Pollen coat area diminished with the age of the selfing transition, with significant reductions in A. thaliana and Capsella rubella, but not in A. lyrata (recent transition, no selfing syndrome). Moreover, specific differentially abundant pollen coat proteins were shared across selfer–outcrosser contrasts more than expected by chance, even though the direction of changes was not consistent across the three comparisons. These specific proteins, while annotated as pathogen response due to their structure, are likely involved in pollen–pistil interactions instead.Overall, our findings reveal limited convergent evolution of pollen coat thickness and protein composition following selfing transitions. Our work identified a group of pollen coat proteins that are largely understudied, but whose abundance appears to be a hotspot for evolutionary changes. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
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  Data: <i>Copyright of New Phytologist is the property of Wiley-Blackwell 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: 10.1111/nph.71167
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      – Code: eng
        Text: English
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        PageCount: 15
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      – SubjectFull: Self-pollination
        Type: general
      – SubjectFull: Convergent evolution
        Type: general
      – SubjectFull: Plant proteomics
        Type: general
      – SubjectFull: Plant reproduction
        Type: general
      – SubjectFull: Pollen
        Type: general
      – SubjectFull: Arabidopsis
        Type: general
    Titles:
      – TitleFull: The abundance of pollen coat small signaling proteins shows limited convergence between independent selfing transitions in Arabidopsis and Capsella.
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            NameFull: İltaş, Ömer
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            NameFull: Salomon, Luciana
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            NameFull: Kovačik, Martin
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            – D: 01
              M: 06
              Text: Jun2026
              Type: published
              Y: 2026
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              Value: 250
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