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Gibberellins Regulate Ovule Integument Development by Interfering with the Transcription Factor ATS
María Dolores Gomez1, Daniel Ventimilla1, Raquel Sacristan1
1Instituto de Biología Molecular y Celular de Plantas, Universidad Politécnica de Valencia-Consejo Superior de Investigaciones Científicas, 46022 Valencia, Spain.
Plant Physiology
|October 30, 2016
Summary
Gibberellins (GAs) regulate plant development. This study reveals GAs are crucial for ovule development, involving DELLA proteins and the ATS transcription factor, impacting seed shape and development.
Area of Science:
- Plant Biology
- Molecular Genetics
- Developmental Biology
Background:
- Gibberellins (GAs) are key plant hormones controlling growth and development.
- DELLA proteins are negative regulators of GA responses.
- Ovule and seed development are critical for plant reproduction.
Purpose of the Study:
- To investigate the role of Gibberellins (GAs) in ovule development.
- To elucidate the mechanism involving DELLA proteins and the ATS transcription factor in integument development.
Main Methods:
- Analysis of della and ats-1 mutant phenotypes.
- Investigation of protein-protein interactions between DELLAs and ATS.
- Gene expression analysis related to GA biosynthesis and integument development.
Main Results:
- Mutants lacking DELLA function (della) or with altered ATS (ats-1) exhibit similar seed defects, including round shape, disorganized testa, and viviparism.
- The ats-1 mutant shows elevated GA levels, indicating ATS inhibits GA biosynthesis.
- DELLA and ATS proteins interact, forming a complex that regulates genes for integument growth.
Conclusions:
- The ATS-DELLA complex is essential for proper ovule integument development.
- ATS represses GA biosynthesis, stabilizing DELLAs for complex formation and ensuring correct ovule development.
- This study provides the first evidence for GA involvement in ovule and seed development.
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