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Organ-Specific Epidermal Bladder Cell Contribution to Quinoa's Performance.

Jon Miranda-Apodaca1, Aitor Agirresarobe1, Alberto Muñoz-Rueda1

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Stem epidermal bladder cells (EBCs) are vital for quinoa growth and ion balance, especially under saline conditions. Removing stem EBCs, but not leaf EBCs, significantly impacted quinoa

Keywords:
epidermal bladder cellshalophytequinoasalinity tolerancestem

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Area of Science:

  • Plant Physiology
  • Halophyte Biology
  • Salt Tolerance Mechanisms

Background:

  • Quinoa (Chenopodium quinoa) is a halophyte known for its resilience in harsh environments.
  • Epidermal bladder cells (EBCs) are hypothesized to contribute to quinoa's salinity tolerance.
  • Previous studies on EBCs' role have produced conflicting results, often focusing solely on leaf EBCs.

Purpose of the Study:

  • To investigate the specific roles of leaf and stem epidermal bladder cells (EBCs) in quinoa's response to salinity.
  • To resolve conflicting evidence regarding the significance of EBCs in salinity tolerance.
  • To explore the contribution of stem EBCs, where ion accumulation is higher than in leaves.

Main Methods:

  • A manipulative experiment was conducted to selectively remove EBCs from quinoa leaves and stems.
  • The effects of EBC removal on plant growth, transpiration, and ion accumulation were assessed under both saline and non-saline conditions.

Main Results:

  • Removal of stem EBCs significantly reduced growth and transpiration in non-saline conditions.
  • Under saline conditions, stem EBC removal led to decreased shoot biomass and reduced Na+ accumulation in the shoot.
  • Removal of leaf EBCs did not significantly affect plant growth under either saline or non-saline conditions.

Conclusions:

  • Stem EBCs are crucial for quinoa's overall growth and ion homeostasis, irrespective of salinity.
  • Stem EBCs play a significant role in managing Na+ accumulation in shoots under saline conditions.
  • The findings suggest that stem EBCs are key regulators of ion homeostasis and water movement in quinoa.