| Categories genes  | Tags leaf  root  anther  development  drought  transcription factor  yield  abiotic stress  reproductive  stress  nucleus  anther development  biotic stress  drought stress  drought stress  transcriptional regulator  reproductive development  vascular bundle  tolerance  phloem  node 
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  • Key message
    • MID1 was primarily expressed in root and leaf vascular tissues, with low level in the tapetum, and was induced by drought and other abiotic stresses
    • Our findings suggest that MID1 is a transcriptional regulator that promotes rice male development under drought by modulating the expressions of drought-related and anther developmental genes and provide valuable information for crop improvement
    • MID1 Plays an Important Role in Response to Drought Stress during Reproductive Development.
    • We show here that MID1 (MYB Important for Drought Response1), encoding a putative R-R-type MYB-like transcription factor, can improve rice yield under drought
    • MID1 was localized to the nucleus and could activate gene expression in yeast, and its homologs were identified in many other plants with high levels sequence similarity
    • Here, we show that the rice R2R3 MYB transcription factor OsARM1 (ARSENITE-RESPONSIVE MYB1) regulates As-associated transporters genes
    • Our findings suggest that the OsARM1 transcription factor has essential functions in regulating As uptake and root-to-shoot translocation in rice
    • Histochemical analysis of OsARM1pro::GUS lines indicated that OsARM1 was expressed in the phloem of vascular bundles in basal and upper nodes
    • Knockout of OsARM1 (OsARM1-KO CRISPR/Cas9-generated mutants) improved tolerance to As(III) and overexpression of OsARM1 (OsARM1-OE lines) increased sensitivity to As(III)
    • Treatment with As(III) induced OsARM1 transcript accumulation and an OsARM1-GFP fusion localized to the nucleus
    • In particular, the As(III) levels in node I were significantly higher in OsARM1-KOs, but significantly lower in OsARM1-OEs, compared to wild-type plants, implying that OsARM1 is important for the regulation of root-to-shoot translocation of As
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