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Early embryo development in Fucus distichus is auxin sensitive
Swati Basu1, Haiguo Sun, Leigh Brian
1Department of Biology, Wake Forest University, Winston-Salem, North Carolina 27109-7325, USA.
Plant Physiology
|September 13, 2002
Summary
This study found that auxin, a plant hormone, influences early brown algae embryo development. Auxin and its transport are crucial for establishing basic body patterns in Fucus embryos.
Area of Science:
- Marine Biology
- Developmental Biology
- Plant Physiology
Background:
- Auxin and polar auxin transport regulate land plant embryo development.
- The role of auxin in early brown alga embryo development remains largely unexplored.
Purpose of the Study:
- To investigate the presence and function of auxin in the early development of Fucus distichus embryos.
- To determine if auxin and auxin transport pathways are conserved in brown algal embryogenesis.
Main Methods:
- Gas chromatography-mass spectrometry identified indole-3-acetic acid (IAA) in Fucus embryos.
- Radioactive IAA uptake and naphthylphthalamic acid (NPA) inhibition assays assessed auxin transport.
- Microscopic examination of embryos treated with IAA and NPA at various developmental stages.
Main Results:
- Fucus embryos accumulate IAA, and NPA enhances this accumulation, indicating an auxin efflux complex.
- Exogenous IAA and NPA treatments induced abnormal rhizoid formation and branching before cell division.
- These effects were observed at early time points, 3.5–5.5 hours after fertilization.
Conclusions:
- Auxin plays a significant role in establishing apical-basal polarity in Fucus distichus embryos.
- Evidence suggests conserved auxin signaling pathways between land plants and brown algae.
- Auxin influences early pattern formation in Fucus embryos prior to cell division and rhizoid germination.