The Developmental Regulator SEEDSTICK Controls Structural and Mechanical Properties of the Arabidopsis Seed Coat

作者：Ignacio Ezquer, Chiara Mizzotti, Eric Nguema‐Ona, Maxime Gotté, Léna Beauzamy, Vívian Ebeling Viana, Nelly Dubrulle, Antônio Costa de Oliveira, Elisabetta Caporali, Abdoul-Salam Koroney, Arezki Boudaoud, Azeddine Driouich, Lucia Colombo · 发表于：The Plant Cell · 年份：2016 · 被引用次数：95 · 研究领域：Polysaccharides and Plant Cell Walls、Plant Molecular Biology Research、Plant nutrient uptake and metabolism

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.