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• W3204436228 abstract "Abstract PLATZ transcription factors play important roles in plant growth, development, and biotic and abiotic stress responses. However, how PLATZ regulates plant drought tolerance and ABA sensitivity remains largely unknown. Here, we show that PLATZ4 increases drought tolerance and ABA sensitivity in Arabidopsis thaliana by suppressing the expression of PIP2;8, DEG3 , At1g33840 and At3g01345, while upregulating the expression of PR1, ABI3, ABI4 and ABI5 . Moreover, PLATZ4 directly binds A/T-rich sequences within the PIP2;8 promoter but not ABI3, ABI4 and ABI5 promoters. Consistent with this, PIP2;8 acts epistatically to PLATZ4 . Furthermore, the aquaporin activity of PIP2;8 was confirmed in Xenopus laevis oocytes and yeast cells in response to osmotic stress. Analysis of water loss of seedlings overexpressing PIP2;8 or lacking PIP2;8 function indicated that PIP2;8-mediated water flow is particularly active in response to drought stress in planta . Accordingly, stomatal closure was enhanced in pip2;8 mutants but reduced in PIP2;8 -overexpressing plants. In platz4 mutant and PLATZ 4-overexpressing plants, water loss and stomatal closure changed oppositely to those in pip2;8 mutants and PIP2;8- overexpressing plants, respectively. In addition, the interaction between PLATZ4 and AITR6 was confirmed by several assays, and the binding of PIP2;8 promoter by PLATZ4 was strengthened by an interaction with AITR6. Collectively, our findings reveal that PLATZ4 interacts with AITR6 to increase ABA sensitivity and drought tolerance in Arabidopsis by upregulating expression of PR1, ABI3, ABI4 and ABI5 while inhibiting the expression of PIP2;8 and associated genes. One sentence summary PLATZ4 interacted with AITR6 to increase drought tolerance and ABA sensitivity in Arabidopsis thaliana by directly bind A/T-rich sequences within the plasma membrane aquaporin (PIP) 2;8 promoter." @default.
• W3204436228 created "2021-10-11" @default.
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• W3204436228 date "2021-10-07" @default.
• W3204436228 modified "2023-09-26" @default.
• W3204436228 title "Regulation of drought tolerance in <i>Arabidopsis</i> involves PLATZ4-mediated transcriptional suppression of <i>PIP2;8</i>" @default.
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• W3204436228 doi "https://doi.org/10.1101/2021.10.06.463369" @default.
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