Journal
PLANT AND CELL PHYSIOLOGY
Volume 55, Issue 12, Pages 2037-2046Publisher
OXFORD UNIV PRESS
DOI: 10.1093/pcp/pcu159
Keywords
Arabidopsis thaliana; Mitogen-activated protein kinase; Osmotic stress; Signal integration; SPEECHLESS; Stomata
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Funding
- Ministry Education, Culture, Sports, Science, and Technology (MEXT) [KAKENHI grant] [19060005, 25113006]
- Japan Society for the Promotion of Science (JSPS) [25091060]
- Indian Council of Agricultural Research (ICAR), New Delhi, India
- Grants-in-Aid for Scientific Research [25113006, 19060005] Funding Source: KAKEN
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Plants, which are sessile unlike most animals, have evolved a system to reduce growth under stress; however, the molecular mechanisms of this stress response are not well known. During programmed development, a fraction of the leaf epidermal precursor cells become meristemoid mother cells (MMCs), which are stem cells that produce both stomatal guard cells and epidermal pavement cells. Here we report that Arabidopsis plants, in response to osmotic stress, post-transcriptionally decrease the protein level of SPEECHLESS, the transcription factor promoting MMC identity, through the action of a mitogen-activated protein kinase (MAPK) cascade. The growth reduction under osmotic stress was lessened by inhibition of the MAPK cascade or by a mutation that disrupted the MAPK target amino acids in SPEECHLESS, indicating that Arabidopsis reduces growth under stress by integrating the osmotic stress signal into the MAPK-SPEECHLESS core developmental pathway.
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