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DNA-DAMAGE REPAIR/TOLERATION PROTEIN111 (DRT111) is a splicing factor regulating ABA sensitivity in Arabidopsis seeds and stomata. It controls gene expression and splicing for ABA and light responses, impacting germination and stomatal closure.

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Area of Science:

  • Plant Molecular Biology
  • Gene Regulation
  • Abiotic Stress Response

Background:

  • RNA splicing is crucial for generating the cellular proteome under environmental conditions.
  • DNA-DAMAGE REPAIR/TOLERATION PROTEIN111 (DRT111), also known as SPLICING FACTOR FOR PHYTOCHROME SIGNALING, is a splicing factor involved in photomorphogenesis.
  • DRT111 interacts with phytochrome B and Arabidopsis Splicing Factor1, which recognizes 3' splice sites.

Purpose of the Study:

  • To investigate the role of DRT111 in abscisic acid (ABA) signaling and seed development in Arabidopsis.
  • To elucidate the molecular mechanisms by which DRT111 integrates light and ABA pathways.

Main Methods:

  • Mutant analysis (double and triple mutants) to study gene splicing.
  • Analysis of DRT111 expression patterns in seeds and stomata.
  • Abscisic acid (ABA) and polyethylene glycol treatments.
  • RNA-sequencing to identify DRT111-controlled genes.
  • Seed germination assays and stomatal movement measurements.

Main Results:

  • DRT111 controls the splicing of ABI3 and acts upstream of SUPPRESSOR OF ABI3-ABI5.
  • DRT111 knock-out mutants exhibit defects in ABA-induced stomatal closure and hypersensitivity to ABA during seed germination.
  • DRT111 overexpression leads to ABA-hyposensitive seed germination.
  • RNA-seq reveals DRT111 regulates genes involved in ABA response, osmotic stress, light signaling, and splicing in dry seeds.
  • DRT111 controls the expression of SOMNUS, an ABA- and PIF-induced germination inhibitor.

Conclusions:

  • DRT111 plays a critical role in regulating ABA sensitivity during seed development, germination, and stomatal function in Arabidopsis.
  • DRT111 integrates ABA and light signaling pathways to control seed germination.
  • DRT111 influences the expression and splicing of key genes involved in stress and developmental responses.