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Recognizing the hidden half in wheat: root system attributes associated with drought tolerance.

Chaonan Li1, Long Li1, Matthew P Reynolds2

  • 1National Key Facility for Crop Gene Resources and Genetic Improvement/Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing 100081, China.

Journal of Experimental Botany
|March 30, 2021
PubMed
Summary

Improving wheat drought tolerance is vital for food security. Key root traits like deep roots and optimal xylem diameter, along with genetic insights, are crucial for breeding enhanced crops.

Keywords:
Drought tolerancegenequantitative trait lociroot developmentroot system architecturewheat

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Area of Science:

  • Agricultural Science
  • Plant Biology
  • Genetics

Background:

  • Drought tolerance in wheat is essential for global food security.
  • Root traits play a critical role in water uptake and drought adaptation.
  • Genetic understanding of root development under drought stress in wheat remains incomplete.

Purpose of the Study:

  • To review root traits associated with drought tolerance in wheat.
  • To identify key genes and quantitative trait loci (QTLs) regulating root development under water-limited conditions.
  • To discuss the genetic basis of root system architecture for improved drought resilience.

Main Methods:

  • Literature review of studies on wheat root traits and drought tolerance.
  • Analysis of genetic factors (QTLs and genes) controlling root development.
  • Synthesis of information on root and shoot trait balance for diverse environments.

Main Results:

  • Deep roots, optimal root length density, increased xylem diameter, and larger root surface area contribute to drought tolerance.
  • Numerous QTLs and genes influencing root development under drought have been identified.
  • The importance of balancing root and shoot traits for overall plant performance is highlighted.

Conclusions:

  • Understanding the genetic control of root traits is key for breeding drought-tolerant wheat.
  • Identified genes and QTLs can facilitate marker-assisted selection and genetic improvement.
  • This review provides a foundation for future research in wheat drought tolerance breeding.