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Climate-smart crops: key root anatomical traits that confer flooding tolerance
Takaki Yamauchi1,2, Koji Noshita1,3,4, Nobuhiro Tsutsumi2
1Japan Science and Technology Agency, PRESTO, Kawaguchi, Saitama 332-0012, Japan.
Breeding Science
|March 25, 2021
Summary
Developing flooding-tolerant crops is crucial due to climate change. Root anatomy, specifically the cortex-to-stele ratio, is key for balancing water and oxygen transport, aiding plant survival in flooded conditions.
Area of Science:
- Plant Biology
- Agronomy
- Climate Change Adaptation
Background:
- Excess soil water (flooding) impairs plant growth by limiting oxygen diffusion to roots.
- Climate change exacerbates flooding risks, necessitating the development of flood-tolerant crops.
- Root anatomical traits critically influence plant water and oxygen transport, impacting drought and flooding tolerance.
Purpose of the Study:
- To review advances in understanding root anatomical traits for drought and flooding tolerance.
- To analyze the trade-off between cortex and stele size in root adaptation.
- To highlight progress in automated analysis and modeling of root traits for crop improvement.
Main Methods:
- Literature review of recent research on root anatomy and flooding tolerance.
- Analysis of the relationship between root structural components (cortex, stele, xylem, aerenchyma) and water/oxygen transport.
- Examination of advancements in computational methods for root trait analysis.
Main Results:
- Root anatomical traits, particularly the cortex-to-stele ratio, are vital for plant adaptation to water stress.
- Aerenchyma in the cortex facilitates oxygen supply, while xylem in the stele aids water uptake.
- There is an inherent trade-off in root structure related to optimizing for drought versus flooding conditions.
Conclusions:
- Understanding root anatomical trade-offs is essential for breeding crops with enhanced flooding tolerance.
- Automated analysis of root traits offers promising avenues for accelerating crop improvement programs.
- Targeting specific root anatomical features can significantly improve crop resilience to soil flooding and climate change impacts.
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