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Seed coat-derived brassinosteroid signaling regulates endosperm development.

Rita B Lima1, Rishabh Pankaj1, Sinah T Ehlert1,2

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|October 30, 2024
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The seed coat signals to the endosperm using brassinosteroids (BR) to control its growth. Maternal BR signaling ensures endosperm proliferation matches seed coat expansion for proper seed development.

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Area of Science:

  • Plant reproductive biology
  • Plant hormone signaling
  • Seed development

Background:

  • Angiosperm seeds develop from embryo, endosperm, and maternal seed coat.
  • Inter-tissue communication is crucial for synchronized seed development.
  • Endosperm-derived auxin promotes seed coat formation.

Purpose of the Study:

  • To investigate the signaling pathway from the seed coat back to the endosperm.
  • To elucidate the role of brassinosteroids (BR) in seed development.
  • To understand how maternal tissues influence embryonic tissue proliferation.

Main Methods:

  • Investigated brassinosteroid (BR) signaling in the seed coat.
  • Analyzed the impact of BR on seed coat cell wall properties.
  • Assessed the effect of seed coat biophysical properties on endosperm proliferation.

Main Results:

  • Seed coat-derived brassinosteroids (BR) promote endosperm proliferation.
  • BR regulate cell wall-related processes in the seed coat.
  • Seed coat's biophysical properties dictate endosperm proliferation rate, independent of cellularization timing.

Conclusions:

  • Maternal brassinosteroid (BR) signaling is essential for regulating endosperm growth.
  • Seed coat expansion, modulated by BR, coordinates endosperm proliferation.
  • This signaling pathway ensures developmental synchrony between maternal and embryonic tissues.