Waterlogging Tolerance Mechanisms in Crop Production

Waterlogging imposes oxygen deficiency on root systems, triggering a suite of adaptive responses in crop plants. Morphological adaptations include formation of root aerenchyma and adventitious roots that enhance internal gas diffusion and maintain root viability. Anatomical features such as barriers to radial oxygen loss preserve internal oxygen supply. Physiologically, plants switch to fermentative metabolism and activate antioxidant systems to counteract reactive oxygen species, while hormonal signals modulate root–shoot communication, adjusting stomatal conductance and photosynthetic rates. At the molecular level, quantitative trait loci and candidate genes associated with tolerance traits have been identified, paving the way for marker-assisted selection and genome-wide association studies. Agronomic and engineering practices—improved drainage, soil structure amendment and targeted nutrient management—complement genetic solutions, forming integrated strategies to sustain yield under transient or chronic flooding. Insights across cereals, legumes and horticultural species highlight both conserved and crop-specific mechanisms that underpin resilience in flood-prone environments.

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Waterlogging Tolerance Mechanisms in Crop Production publication trend

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Technical terms

Aerenchyma: Tissue with enlarged air spaces in roots that facilitates internal oxygen diffusion under hypoxic conditions.

Adventitious roots: Roots formed from non-root tissues, often near the soil surface, enhancing gas exchange when soils are waterlogged.

Radial oxygen loss barrier: A modification in root cell walls that restricts outward diffusion of oxygen, preserving internal oxygen levels.

Hypoxia: A state of low oxygen availability in plant tissues, typically occurring in the root zone during waterlogging.

Reactive oxygen species (ROS): Highly reactive molecules produced under stress that can damage proteins, lipids and nucleic acids if not detoxified.

References

1. Waterlogging Tolerance of Crops: Breeding, Mechanism of Tolerance, Molecular Approaches, and Future Prospects. BioMed Research International (2012).
2. Soil and Crop Management Practices to Minimize the Impact of Waterlogging on Crop Productivity. Frontiers in Plant Science (2019).
3. Plant response to combined salinity and waterlogging stress: Current research progress and future prospects. Plant Stress (2023).
4. Differences in Physiological Responses of Two Tomato Genotypes to Combined Waterlogging and Cadmium Stresses. Antioxidants (2023).
5. Waterlogging stress reduces cowpea Vigna unguiculata L.) genotypes growth, seed yield, and quality at different growth stages: Implications for developing tolerant cultivars under field conditions. Agricultural Water Management (2023).