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

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.