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Cell wall structure and composition is affected by light quality in tomato seedlings
Renan Falcioni1, Thaise Moriwaki2, Marina Perez-Llorca3
1Plant Ecophysiology Laboratory, Department of Biology, State University of Maringá, Av. Colombo, 5790, 87020-900 Maringá, Paraná, Brazil; Plant Biochemistry Laboratory, Department of Biochemistry, State University of Maringá, Av. Colombo, 5790, 87020-900 Maringá, Paraná, Brazil.
Journal of Photochemistry and Photobiology. B, Biology
|January 14, 2020
Summary
Light quality significantly impacts tomato seedling cell walls, affecting hypocotyl growth. Thicker walls under blue/white light and thinner walls in dark/far-red light correlate with growth inhibition/promotion, respectively.
Area of Science:
- Plant Biology
- Cell Biology
- Photomorphogenesis
Background:
- Light quality is a critical environmental factor influencing plant development.
- Cell wall structure and composition play a vital role in regulating cell expansion and organ growth.
Purpose of the Study:
- To investigate the effects of different light qualities on tomato seedling cell wall properties.
- To determine the relationship between cell wall characteristics and hypocotyl growth under varying light conditions.
Main Methods:
- Tomato seedlings were grown under various light conditions (white, blue, green, red, far-red, dark).
- Cell wall thickness, composition (calcium, pectin), and microfibril orientation were analyzed.
- Techniques included transmission electron microscopy and X-ray scattering.
Main Results:
- Cell wall thickness negatively correlated with hypocotyl growth; thicker walls under blue/white light, thinner under far-red/dark.
- Microfibril orientation differed, with random angles in inner layers under far-red/dark and longitudinal alignment in outer layers.
- Higher calcium and pectin content were observed under blue/white light, correlating with reduced cell wall extensibility.
Conclusions:
- Light quality differentially modulates tomato seedling cell wall structure and composition.
- Cell wall thickness and microfibril orientation are key determinants of hypocotyl growth under different light spectra.
- Findings support the multinet growth hypothesis regarding differential orientation of newly deposited cell wall layers.
Keywords:
Cell wallCellulose microfibrils angleHormone profilePhotomorphogenesisSkotomorphogenesisSmall angle X-ray scatteringMore Related Videos
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