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A novel strigolactone-miR156 module controls stomatal behaviour during drought recovery
Ivan Visentin1, Chiara Pagliarani1,2, Eleonora Deva1,3
1Plant Stress Lab, Department of Agriculture, Forestry and Food Science DISAFA - Turin University, Grugliasco, Italy.
Plant, Cell & Environment
|March 21, 2020
Summary
Strigolactones link drought stress to miR156 in tomato plants, mediating abscisic acid (ABA)-dependent effects on stomatal closure and drought after-effects.
Area of Science:
- Plant Biology
- Molecular Biology
- Stress Physiology
Background:
- MicroRNA156 (miR156) function and stress induction are unclear.
- Strigolactones are key phytohormones for drought acclimation, influencing stomatal closure.
- The connection between miR156, strigolactones, and stress response is unestablished.
Purpose of the Study:
- To investigate the role of miR156 in drought response in tomato.
- To explore the interplay between strigolactones, miR156, and abscisic acid (ABA) signaling under drought.
- To identify downstream effectors of strigolactone-mediated stomatal closure.
Main Methods:
- Comparative analysis of wild-type and miR156-overexpressing tomato plants under drought.
- Quantification of miR156 levels in response to strigolactone manipulation and drought stress.
- Measurement of ABA accumulation, sensitivity, and stomatal conductance.
- Transcriptomic profiling of miR156 targets in strigolactone-depleted plants.
Main Results:
- miR156 overexpression and strigolactone treatment reduced stomatal conductance and increased ABA sensitivity.
- Strigolactones induced miR156 accumulation, and endogenous strigolactones were necessary for drought-induced miR156.
- Both strigolactones and miR156 enhanced the drought after-effect on stomatal reopening.
- Strigolactone depletion altered the expression of several miR156 targets.
Conclusions:
- Strigolactones act as a molecular link between drought and miR156 in tomato.
- miR156 mediates the ABA-dependent effects of strigolactones on stomatal behavior during drought recovery.
- This study elucidates the roles of strigolactones and miR156 in plant stomatal regulation under stress.
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