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Phan Thi Thanh Hoai1, Jiaen Qiu2, Michael Groszmann3

  • 1Australian Research Council Centre of Excellence in Plant Energy Biology, Waite Research Precinct, University of Adelaide, Glen Osmond, SA, Australia; and School of Agriculture, Food and Wine, and Waite Research Institute, Waite Research Precinct, University of Adelaide, Glen Osmond, SA, Australia; and Faculty of Agriculture and Forestry, Tay Nguyen University, 567 Le Duan, BMT, Dak Lak, Vietnam.

Functional Plant Biology : FPB
|June 6, 2023
PubMed
Summary

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This summary is machine-generated.

Arabidopsis PIP2;1 aquaporins influence seed germination, especially under saline conditions. Mutants and over-expressing lines show altered germination, ion content, and water uptake, suggesting a key role for PIP2;1.

Area of Science:

  • Plant Biology
  • Molecular Biology
  • Physiology

Background:

  • Aquaporin gene expression dynamically changes during seed germination.
  • Arabidopsis thaliana PIP2;1 transcripts increase significantly within 24 hours of seed imbibition.

Purpose of the Study:

  • To investigate the role of Arabidopsis PIP2;1 in seed germination.
  • To analyze the effects of AtPIP2;1 on germination efficiency, seed hydration, and ion content under saline conditions.

Main Methods:

  • Examined wild-type, single (Atpip2;1), and double (Atpip2;1-Atpip2;2) loss-of-function mutants, and 2x35S::AtPIP2;1 over-expressing (OE) lines.
  • Germinated seeds under control and saline (75mM NaCl) conditions.
  • Assessed germination efficiency, imbibed seed maximum cross-sectional area, imbibed seed mass, and seed Na+ and K+ content.

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Main Results:

  • Mutants and OE lines exhibited delayed germination under saline conditions compared to wild-type and null-segregant controls.
  • Atpip2;1 mutants showed greater imbibed seed mass and less Na+ accumulation under saline stress.
  • AtPIP2;1 OE lines displayed reduced imbibed seed mass and higher K+ content under saline stress.

Conclusions:

  • AtPIP2;1 plays a significant role in seed germination processes.
  • Its function may involve water and ion transport, H2O2 signaling, or regulation of other aquaporins.
  • Findings suggest potential for optimizing germination in suboptimal environments like saline soils.