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Stress in native grasses under ecologically relevant heat waves.

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Native grasses face significant threats from intensifying heat waves. C4 grasses demonstrate greater tolerance to combined heat and drought stress than C3 grasses, highlighting crucial differences in plant resilience.

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Area of Science:

  • Plant physiology
  • Climate change biology
  • Ecology

Background:

  • Increasing heat waves with low water availability pose significant threats to organisms.
  • Native grasses are vital components of ecosystems, but their tolerance to extreme climate events is not fully understood.

Purpose of the Study:

  • To assess the tolerance of native Eastern Australian grasses to simulated heat waves with low water availability.
  • To investigate differential physiological and molecular responses between C3 and C4 grasses under combined heat and drought stress.

Main Methods:

  • Six native grass species were subjected to simulated heat wave conditions in controlled temperature cabinets.
  • Key stress indicators measured included leaf senescence, leaf water content, photosynthetic efficiency, and the expression of heat shock proteins (Hsp70 and smHsp17.6).

Main Results:

  • Combined heat and drought stress significantly increased leaf senescence.
  • C4 grasses exhibited greater tolerance than C3 grasses, with less decline in leaf water content and photosynthetic efficiency under combined stress.
  • Heat shock protein 70 (Hsp70) expression increased with heat treatment, while smHsp17.6 showed variable responses.

Conclusions:

  • C4 grasses are more resilient to heat waves with low water availability than C3 grasses.
  • Variability in tolerance within species suggests potential for individual plant loss during extreme events.
  • Understanding responses to combined stressors is crucial for predicting the impact of future hotter, drier climates on native plant communities.