Summary
This study investigated how root treatment with paramylon from Euglena gracilis modulates xylem hormone levels and physiological responses in tomato plants. Paramylon application produced dose-dependent increases in defence-related hormones and improved photosynthetic performance and water-use efficiency, particularly under dehydration stress. The findings suggest paramylon acts as a plant elicitor capable of enhancing drought tolerance through modulation of stomatal conductance and CO₂ diffusion pathways.
Regional applicability
The study was conducted in a controlled experimental setting on tomato, a commercially important horticultural crop grown throughout the United Kingdom. Whilst findings may be applicable to UK glasshouse or protected tomato production, transferability to field conditions and other crops would require further validation.
Key measures
Xylem hormone levels (abscisic acid, jasmonic acid, salicylic acid); CO₂ assimilation rate; stomatal conductance; mesophyll conductance; intercellular CO₂ concentration; transpiration rate; water-use efficiency; quantum yield of photosystem II; leaf water potential
Outcomes reported
The study measured xylem hormone levels (abscisic acid, jasmonic acid, salicylic acid), photosynthetic performance (CO₂ assimilation rate, stomatal and mesophyll conductance, intercellular CO₂ concentration, quantum yield of photosystem II), water-use efficiency, transpiration rate, and leaf water potential in tomato plants treated with paramylon. A dose-dependent effect of paramylon on hormone content, photosynthetic performance and dehydration tolerance was reported.
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