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Buffering growth variations against water deficits through timely carbon usage
Florent Pantin1, Anne-Laure Fanciullino2, Catherine Massonnet1
1UMR 759, Laboratoire d'Ecophysiologie des Plantes sous Stress Environnementaux, Institut de Biologie Intégrative des Plantes, Institut National de la Recherche Agronomique Montpellier, France.
Frontiers in Plant Science
|December 19, 2013
Summary
Water deficits do not cause sugar starvation in plants. Instead, moderate water stress leads to excess carbohydrates, which aid plant growth by preventing shrinkage and osmotic adjustment.
Area of Science:
- Plant Physiology
- Plant Metabolism
- Drought Stress Response
Background:
- Water stress impacts plant growth, but its effect on carbon metabolism and growth reduction remains debated.
- While sugar starvation is often cited for severe water deficits, evidence suggests otherwise for moderate stress.
Purpose of the Study:
- To investigate the role of carbon availability in plant growth under moderate water deficits.
- To determine if plants experience carbon satiation or starvation during water stress.
Main Methods:
- Monitoring leaf growth in Arabidopsis thaliana under moderate soil water deficit, comparing wild-type and carbohydrate-deficient mutants.
- Analyzing sub-hourly growth variations in clementine fruits under fluctuating air water deficit and varying source-sink ratios (via defoliation).
Main Results:
- Moderate soil water deficit enhanced nighttime leaf growth in carbohydrate-deficient mutants, indicating carbon satiation.
- High carbohydrate levels in clementine fruits mitigated hydraulic shrinkage during high evaporative demand, likely via osmotic adjustment.
Conclusions:
- Growing organs under moderate water deficit are not carbon-starved but experience carbohydrate excess.
- Excess soluble carbohydrates help alleviate hydromechanical limitations on growth during water stress.
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