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Guard Cell Transcriptome Reveals Membrane Transport, Stomatal Development and Cell Wall Modifications as Key Traits
Fatemeh Rasouli1,2,3, Ali Kiani-Pouya4,3, Ali Movahedi5
1Tasmanian Institute of Agriculture, College of Science and Engineering, University of Tasmania, Hobart, TAS 7001, Australia.
Plant & Cell Physiology
|November 10, 2022
Summary
Halophytic quinoa adapts to salt stress by modulating guard cell genes for transport and cell wall plasticity, unlike glycophytic spinach. This enhances water use efficiency and stomatal response in quinoa.
Area of Science:
- Plant Biology
- Molecular Biology
- Physiology
Background:
- Guard cells (GCs) regulate stomatal function, crucial for plant adaptation to environmental stresses like salinity.
- Halophytic (salt-tolerant) and glycophytic (salt-sensitive) species exhibit differential responses to salinity at the molecular level.
Purpose of the Study:
- To compare transcriptional changes in guard cells of halophytic quinoa and glycophytic spinach under sodium chloride (NaCl) stress.
- To identify key genes and pathways involved in salt tolerance mechanisms within guard cells.
Main Methods:
- Comparative transcriptomic analysis of guard cell-enriched epidermal fragments from quinoa and spinach.
- Exposure of plants to 250 mM sodium chloride for three weeks.
- Mechanical preparation of epidermal fragments for gene expression analysis.
Main Results:
- Salt-responsive genes in both species were associated with protein metabolism, secondary metabolites, signal transduction, and transport.
- Quinoa guard cells showed induced expression of abscisic acid (ABA) signaling/biosynthesis genes and transporters for amino acids, proline, sugars, and potassium.
- Spinach guard cells upregulated lignin synthesis genes, while quinoa upregulated cell wall plasticity genes (Pectin methylesterase3 - PME3) and genes inhibiting stomatal development, leading to reduced stomatal density.
Conclusions:
- Quinoa exhibits superior salt adaptation through guard cell gene modulation, including enhanced ABA signaling, nutrient transport, and cell wall plasticity.
- Differential regulation of cell wall synthesis and stomatal development in quinoa's guard cells contributes to improved water use efficiency and faster stomatal response.
- These findings highlight the critical role of guard cell transcriptional reprogramming in plant salinity tolerance.
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