Cell wall structure and composition is affected by light quality in tomato seedlings
| Autor: | Francielle Sato, Marina Pérez-Llorca, Werner Camargos Antunes, Mariana Sversut Gibin, Andressa Pelozo, Renan Falcioni, Mariana Pattaro, Thaise Moriwaki, Markus Rüggeberg, Sergi Munné-Bosch, Marina Ellen Giacomelli |
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| Rok vydání: | 2019 |
| Předmět: |
Light
Biophysics Skotomorphogenesis Hypocotyl Cell wall Anthocyanins Solanum lycopersicum Microscopy Electron Transmission Plant Growth Regulators X-Ray Diffraction Auxin Cell Wall Scattering Small Angle Radiology Nuclear Medicine and imaging Chromatography High Pressure Liquid chemistry.chemical_classification Principal Component Analysis Radiation Radiological and Ultrasound Technology Chemistry Cell growth Transmission electron microscopy Seedlings Microfibrils Pectins Photomorphogenesis Calcium Elongation |
| Zdroj: | Journal of photochemistry and photobiology. B, Biology. 203 |
| ISSN: | 1873-2682 |
| Popis: | Light affects many aspects of cell development. Tomato seedlings growing at different light qualities (white, blue, green, red, far-red) and in the dark displayed alterations in cell wall structure and composition. A strong and negative correlation was found between cell wall thickness and hypocotyl growth. Cell walls was thicker under blue and white lights and thinner under far-red light and in the dark, while intermediate values was observed for red or green lights. Additionally, the inside layer surface of cell wall presented random deposited microfibrillae angles under far-red light and in the dark. However, longitudinal transmission electron microscopy indicates a high frequency of microfibrils close to parallels related to the elongation axis in the outer layer. This was confirmed by ultra-high resolution small angle X-ray scattering. These data suggest that cellulose microfibrils would be passively reoriented in the longitudinal direction. As the cell expands, the most recently deposited layers (inside) behave differentially oriented compared to older (outer) layers in the dark or under FR lights, agreeing with the multinet growth hypothesis. High Ca and pectin levels were found in the cell wall of seedlings growing under blue and white light, also contributing to the low extensibility of the cell wall. Low Ca and pectin contents were found in the dark and under far-red light. Auxins marginally stimulated growth in thin cell wall circumstances. Hypocotyl growth was stimulated by gibberellins under blue light. |
| Databáze: | OpenAIRE |
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