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Drought Stress. Erich Baker. Most drought stress genes ABA-dependent. Resource conservation mode Common to many stress response pathways In drought, often produced in roots, then migrates Over 300 ABA-induced genes identified (2006). Inhibits division of cells, slowing growth

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drought stress

Drought Stress

Erich Baker

slide2

Most drought stress genes ABA-dependent.

  • Resource conservation mode
  • Common to many stress response pathways
  • In drought, often produced in roots, then migrates
  • Over 300 ABA-induced genes identified (2006)
slide3

Inhibits division of cells, slowing growth

  • Synthesis of cuticle and osmoprotectants
  • Closing of stomata
  • Inhibits fruit ripening, seed germination
  • Downregulates photosynthesis

Just adding ABA will inhibit growth, need to selectively activate pathways.

slide4

PYR/PYL is ABA receptor

  • Inhibits PP2C which normally inhibits SnRK2
  • Activating SnRK2 activates a wide array of molecules
some important drought stress pathways to consider
Some Important Drought Stress Pathways to Consider
  • MYB transcription factor causes increased cuticle wax deposition
  • MPKs and ExtCaMs regulate stomatal closure
  • NAC transcription factors and M6PR synthesize osmoprotectants
  • ABA represses IPTs and CKXs, slows cell division