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Mechanism of fertilization-induced auxin synthesis in the endosperm for seed and fruit development

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  • Lei Guo

    (University of Maryland)

  • Xi Luo

    (University of Maryland)

  • Muzi Li

    (University of Maryland)

  • Dirk Joldersma

    (University of Maryland)

  • Madison Plunkert

    (University of Maryland)

  • Zhongchi Liu

    (University of Maryland)

Abstract

The dominance of flowering plants on earth is owed largely to the evolution of maternal tissues such as fruit and seedcoat that protect and disseminate the seeds. The mechanism of how fertilization triggers the development of these specialized maternal tissues is not well understood. A key event is the induction of auxin synthesis in the endosperm, and the mobile auxin subsequently stimulates seedcoat and fruit development. However, the regulatory mechanism of auxin synthesis in the endosperm remains unknown. Here, we show that a type I MADS box gene AGL62 is required for the activation of auxin synthesis in the endosperm in both Fragaria vesca, a diploid strawberry, and in Arabidopsis. Several strawberry FveATHB genes were identified as downstream targets of FveAGL62 and act to repress auxin biosynthesis. In this work, we identify a key mechanism for auxin induction to mediate fertilization success, a finding broadly relevant to flowering plants.

Suggested Citation

  • Lei Guo & Xi Luo & Muzi Li & Dirk Joldersma & Madison Plunkert & Zhongchi Liu, 2022. "Mechanism of fertilization-induced auxin synthesis in the endosperm for seed and fruit development," Nature Communications, Nature, vol. 13(1), pages 1-15, December.
    • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-31656-y
    DOI: 10.1038/s41467-022-31656-y
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