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

Lei Guo, Xi Luo, Muzi Li, Dirk Joldersma, Madison Plunkert and Zhongchi Liu ()
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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

Nature Communications, 2022, vol. 13, issue 1, 1-15

Abstract: 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.

Date: 2022
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DOI: 10.1038/s41467-022-31656-y

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