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Updated: May 15, 2025

A Seed Coat Bedding Assay to Genetically Explore In Vitro How the Endosperm Controls Seed Germination in Arabidopsis thaliana
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Fertilization-dependent phloem end gate regulates seed size.

Xiaoyan Liu1, Kohdai P Nakajima2, Prakash Babu Adhikari3

  • 1School of Life Sciences, Fujian Agriculture and Forestry University, Fuzhou, Fujian 350002, China; FAFU-UCR Joint Center and Fujian Provincial Key Laboratory of Haixia Applied Plant Systems Biology, Haixia Institute of Science and Technology, Fujian Agriculture and Forestry University, Fuzhou, Fujian 350002, China.

Current Biology : CB
|April 8, 2025
PubMed
Summary
This summary is machine-generated.

A newly discovered chalazal gate controls nutrient flow into developing seeds. This gate, regulated by callose, offers a new target for enhancing seed size in crops.

Keywords:
callose degradationcallose depositionfertilization recovery systemfinal form of the phloem endkasahara gatewayplant fertilizationpollen tube dependent ovule enlargement morphologyputative plasmodesmata associated proteinseed nutrient transport

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Area of Science:

  • Plant reproductive biology
  • Molecular plant science
  • Agricultural biotechnology

Background:

  • Seed formation is critical for plant propagation and global food security.
  • Seed size is a key determinant of crop yield and quality.
  • Understanding the regulation of nutrient transport into seeds is essential for crop improvement.

Purpose of the Study:

  • To elucidate a novel mechanism regulating nutrient transport into developing seeds.
  • To identify the molecular players involved in controlling seed size.
  • To explore the potential of this mechanism for increasing crop yields.

Main Methods:

  • Investigated ovule development and nutrient transport in Arabidopsis thaliana.
  • Utilized genetic mutants (AtBG_ppap mutant and overexpression lines) to study gene function.
  • Analyzed callose deposition and degradation using microscopy and biochemical assays.
  • Examined the conservation of the mechanism in rice (Oryza sativa).

Main Results:

  • Identified a "gate" at the chalazal end of the ovule that regulates nutrient flow.
  • Demonstrated that callose deposition blocks this gate in unfertilized ovules, while fertilization triggers callose removal.
  • Showed that mutations affecting β-1,3-glucanase (AtBG_ppap) impact callose degradation, leading to altered seed size.
  • Found that manipulating this gate can significantly increase seed size, a mechanism conserved in rice.

Conclusions:

  • A novel chalazal gate mechanism regulates seed size by controlling nutrient transport via callose dynamics.
  • The ovule-expressed β-1,3-glucanase gene (AtBG_ppap) plays a crucial role in this process.
  • This finding has significant implications for crop breeding and enhancing seed yield in angiosperms.