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Mechanism of fertilization-induced auxin synthesis in the endosperm for seed and fruit development
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Mechanism of fertilization-induced auxin synthesis in the endosperm for seed and fruit development
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Journal Article
Mechanism of fertilization-induced auxin synthesis in the endosperm for seed and fruit development
2022
Overview
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.
In flowering plants, fertilization triggers auxin synthesis in the endosperm to promote seed and fruit development. Here the authors show that an MADS-box transcription factor AGL62 is required to activate auxin synthesis in the endosperms of Fragaria vesca, a diploid strawberry, and Arabidopsis.
