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- Title
Developmental Regulator SEEDSTICK Controls Structural and Mechanical Properties of the Arabidopsis Seed Coat.
- Authors
Ezquer, Ignacio; Mizzotti, Chiara; Nguema-Ona, Eric; Gotté, Maxime; Beauzamy, Léna; Viana, Vivian Ebeling; Dubrulle, Nelly; Oliveira, Antonio Costa de; Caporali, Elisabetta; Koroney, Abdoul-Salam; Boudaoud, Arezki; Driouich, Azeddine; Colombo, Lucia
- Abstract
Although many transcription factors involved in cell wall morphogenesis have been identified and studied, it is still unknown how genetic and molecular regulation of cell wall biosynthesis is integrated into developmental programs. We demonstrate by molecular genetic studies that SEEDSTICK (STK), a transcription factor controlling ovule and seed integument identity, directly regulates PMEI6 and other genes involved in the biogenesis of the cellulose-pectin matrix of the cell wall. Based on atomic force microscopy, immunocytochemistry, and chemical analyses, we propose that structural modifications of the cell wall matrix in the stk mutant contribute to defects in mucilage release and seed germination under water-stress conditions. Our studies reveal a molecular network controlled by STK that regulates cell wall properties of the seed coat, demonstrating that developmental regulators controlling organ identity also coordinate specific aspects of cell wall characteristics.
- Subjects
OVULES; ATOMIC force microscopy; GENETIC regulation; DEVELOPMENTAL programs; ARABIDOPSIS; TRANSCRIPTION factors; GERMINATION
- Publication
Plant Cell, 2016, Vol 28, Issue 10, p2478
- ISSN
1040-4651
- Publication type
Article
- DOI
10.1105/tpc.16.00454