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Structure, ultrastructure and cation accumulation in quinoa epidermal bladder cell complex under high saline stress
María Belén Palacios1,2, Axel Joel Rizzo1,2, Tatiana Belén Heredia2,3
1Departamento de Biodiversidad y Biología Experimental, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires, Argentina.
Protoplasma
|January 13, 2024
Summary
Quinoa
Area of Science:
- Plant Biology
- Agronomy
- Cell Biology
Background:
- Quinoa exhibits remarkable salt tolerance, a key trait for agriculture in saline environments.
- The epidermal bladder cell complex (EBCc) is a specialized structure in quinoa leaves.
- Understanding EBCc function is crucial for elucidating quinoa's salinity tolerance mechanisms.
Purpose of the Study:
- To investigate the cellular characteristics of quinoa's epidermal bladder cell complex (EBCc).
- To determine the role of EBCc in quinoa's response to salt stress.
- To analyze ion accumulation within EBCc under saline conditions.
Main Methods:
- Utilized advanced microscopy techniques including light, confocal RAMAN, confocal fluorescence, transmission electron, and environmental scanning electron microscopy.
- Performed energy-dispersive X-ray analysis for elemental composition.
- Quantified ionic content using flame atomic absorption spectroscopy and flame emission photometry.
Main Results:
- EBCc structure varies with leaf age; stalk cells store lipids, bladder cells contain carotenes and oxalate crystals.
- Both cell types possess cuticles with distinct wax and cutin content; chloroplasts are present in both.
- Under salinity, bladder cells preferentially accumulate K+ over Na+, while stem parenchyma becomes the main Na+ sink.
Conclusions:
- Quinoa's EBCc possesses unique cellular features contributing to its salt tolerance.
- Specific ion compartmentalization within EBCc and stem parenchyma plays a vital role in managing salt stress.
- This study enhances understanding of the structural and functional basis of halophyte adaptation.
Keywords:
Chenopodium quinoaEpidermal bladder cell complexPotassiumSalt stressSodiumStructural biologyMore Related Videos
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