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Drought Stress

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

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  1. Drought Stress Erich Baker

  2. 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)

  3. 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.

  4. PYR/PYL is ABA receptor • Inhibits PP2C which normally inhibits SnRK2 • Activating SnRK2 activates a wide array of molecules

  5. 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

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