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Physiological Plasticity Is Important for Maintaining Sugarcane Growth under Water Deficit
Paulo E R Marchiori1, Eduardo C Machado2, Cristina R G Sales3
1Department of Biology, Federal University of Lavras, Lavras, Brazil.
Frontiers in Plant Science
|January 13, 2018
Summary
Sugarcane drought tolerance relies on distinct strategies. Physiological plasticity, not morphological changes, is more crucial for young plants facing water deficit, ensuring better growth under stress.
Area of Science:
- Plant Science
- Agronomy
- Drought Physiology
Background:
- Water availability is critical for early crop establishment.
- Sugarcane varieties exhibit varied responses to drought conditions.
Purpose of the Study:
- To evaluate the importance of morphological and physiological plasticity in young sugarcane plants under water deficit.
- To test if high phenotypic plasticity correlates with drought tolerance.
Main Methods:
- Sugarcane plants (IACSP95-5000 and IACSP94-2094) were grown in rhizotrons for 35 days.
- Three water availability levels were applied: high, intermediate, and low (Ψm < -150 kPa).
- Morphological (leaf area) and physiological (leaf gas exchange, photochemical traits) plasticity were assessed.
Main Results:
- Drought responses in sugarcane are genotype and water deficit intensity dependent.
- IACSP95-5000 showed higher physiological plasticity; IACSP94-2094 exhibited greater morphological plasticity.
- High morphological plasticity did not guarantee better biomass accumulation under water deficit.
Conclusions:
- Sugarcane varieties employ distinct drought tolerance strategies, focusing on either physiological or morphological adjustments.
- Physiological plasticity is more vital than morphological plasticity for maintaining growth in young sugarcane plants under water scarcity.
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