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Genotype-Specific Activation of Autophagy during Heat Wave in Wheat
Kathleen Hickey1, Yunus Şahin1, Glenn Turner1
1Institute of Biological Chemistry, Washington State University, Pullman, WA 99163, USA.
Cells
|July 26, 2024
Summary
Autophagy, a cellular recycling process, may have been unintentionally selected in wheat breeding for arid climates. Higher autophagic activity in wheat correlates with increased yield, suggesting its selection for resilience.
Area of Science:
- Plant Science
- Genetics
- Cell Biology
Background:
- Autophagy is crucial for cellular homeostasis and resilience.
- Wheat breeding for arid climates may have inadvertently selected for autophagy.
- Understanding autophagy's role can improve crop resilience.
Purpose of the Study:
- To test if autophagy was unintentionally selected in wheat breeding for arid climates.
- To investigate the response of autophagy markers to heat and drought stress.
- To correlate autophagic activity with wheat yield.
Main Methods:
- Assessed three autophagy markers (ATG7, ATG8, NBR1) in 16 spring wheat landraces.
- Exposed wheat to a heat wave (40°C) under reduced soil moisture.
- Used greenhouse trials, transcript analysis, and principal component analysis.
Main Results:
- ATG8 and NBR1 showed genotype-specific responses to heat/drought; ATG7 did not.
- Higher autophagic activity (lower ATG8/NBR1 protein, higher transcript) correlated with higher yield.
- Some high-yielding genotypes showed suppressed autophagy, indicating alternative resilience mechanisms.
Conclusions:
- Autophagy activation by heat/drought is genotype-specific and heat-sensitive.
- Enhanced autophagic activity positively correlates with wheat yield.
- Wheat breeding programs may have independently selected for enhanced autophagy in different regions.
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