What question did this study set out to answer?

The aim is to investigate the effects of glutamic acid and other compounds on drought tolerance in poplar.

April 27, 2026Discover Plants.Open Access

Foliar application of glutamic acid enhances drought tolerance in poplar by coordinating physiological, molecular, and phyllosphere microbial responses

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Randomized trial demonstrates improved drought tolerance in poplar with glutamic acid application, suggesting new strategies for stress resilience.

The aim is to investigate the effects of glutamic acid and other compounds on drought tolerance in poplar.
Applied varying concentrations of Coumarin, Glutamic Acid, and Glycine Betaine to Populus deltoides.
Measured morphological, biochemical traits, and microbial responses to treatments.
Analyzed relative expression of stress-responsive genes and antioxidant activities.
Glutamic acid improved leaf area, leaf count, and photosynthetic efficiency by 15%.
Positive modulation of osmolytes (proline, soluble sugars, proteins) was noted with GA and GB treatments.
Significant up-regulation of stress-responsive genes P5CS and DREB upon GA application.

Kumar et al. (2026) studied this question.

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Randomized trial demonstrates improved drought tolerance in poplar with glutamic acid application, suggesting new strategies for stress resilience.