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Awned versus awnless wheat spikes: does it matter?

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Wheat awns, present for millennia, impact grain weight but reduce grain number. Their effect on yield varies across different environments, showing a complex evolutionary role.

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Area of Science:

  • Plant genetics and evolution
  • Agricultural science
  • Crop physiology

Background:

  • Wheat (Triticum spp.) exhibits both awned and awnless forms globally.
  • Historical evidence indicates awns were predominant for most of wheat's domestication history.
  • Selection against awns appears to be a relatively recent phenomenon in wheat cultivation.

Purpose of the Study:

  • To investigate the evolutionary history and domestication of wheat awns.
  • To quantify the impact of awns on spike photosynthesis and crop yield.
  • To analyze the role of awns in different environmental conditions.

Main Methods:

  • Analysis of archeological and historical records on wheat morphology.
  • Quantification of spike photosynthesis in awned versus awnless wheat.
  • Field experiments evaluating yield components under contrasting environments.

Main Results:

  • Awns were found to increase grain weight, both directly by enlarging grains and indirectly by affecting distal grain development.
  • Increased grain weight due to awns was not linked to enhanced spike photosynthesis.
  • A trade-off was observed where awns led to a decrease in the total number of grains per spike.

Conclusions:

  • The favorable effects of wheat awns on overall yield are not consistent and depend heavily on environmental factors.
  • Awns play a complex role in wheat evolution, influencing grain weight and number with variable yield outcomes.
  • Understanding the environmental interactions of awn traits is crucial for wheat breeding and cultivation.