Drought Stress
description
Transcript of Drought Stress
![Page 1: Drought Stress](https://reader035.fdocuments.net/reader035/viewer/2022062323/56815e97550346895dcd2727/html5/thumbnails/1.jpg)
Drought Stress
Erich Baker
![Page 2: Drought Stress](https://reader035.fdocuments.net/reader035/viewer/2022062323/56815e97550346895dcd2727/html5/thumbnails/2.jpg)
• 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)
![Page 3: Drought Stress](https://reader035.fdocuments.net/reader035/viewer/2022062323/56815e97550346895dcd2727/html5/thumbnails/3.jpg)
• 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.
![Page 4: Drought Stress](https://reader035.fdocuments.net/reader035/viewer/2022062323/56815e97550346895dcd2727/html5/thumbnails/4.jpg)
• PYR/PYL is ABA receptor• Inhibits PP2C which
normally inhibits SnRK2• Activating SnRK2
activates a wide array of molecules
![Page 5: Drought Stress](https://reader035.fdocuments.net/reader035/viewer/2022062323/56815e97550346895dcd2727/html5/thumbnails/5.jpg)
![Page 6: Drought Stress](https://reader035.fdocuments.net/reader035/viewer/2022062323/56815e97550346895dcd2727/html5/thumbnails/6.jpg)
![Page 7: Drought Stress](https://reader035.fdocuments.net/reader035/viewer/2022062323/56815e97550346895dcd2727/html5/thumbnails/7.jpg)
![Page 8: Drought Stress](https://reader035.fdocuments.net/reader035/viewer/2022062323/56815e97550346895dcd2727/html5/thumbnails/8.jpg)
![Page 9: Drought Stress](https://reader035.fdocuments.net/reader035/viewer/2022062323/56815e97550346895dcd2727/html5/thumbnails/9.jpg)
![Page 10: Drought Stress](https://reader035.fdocuments.net/reader035/viewer/2022062323/56815e97550346895dcd2727/html5/thumbnails/10.jpg)
![Page 11: Drought Stress](https://reader035.fdocuments.net/reader035/viewer/2022062323/56815e97550346895dcd2727/html5/thumbnails/11.jpg)
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