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Adventitious root growth and cell-cycle induction in deepwater rice
1Institut fur Allgemeine Botanik, Angewandte Molekularbiologie der Pflanzen II, Ohnhorststrasse 18, D-22609 Hamburg, Germany.
Plant Physiology
|January 8, 1999
Summary
Ethylene treatment stimulates deepwater rice (Oryza sativa) adventitious root growth during flooding. This involves cell cycle activation and gene expression changes, enabling survival in waterlogged conditions.
Area of Science:
- Plant Biology
- Molecular Biology
- Genetics
Background:
- Deepwater rice (Oryza sativa) possesses adaptations for survival in flooded environments.
- Adventitious roots are crucial for water, nutrient uptake, and anchorage during prolonged submergence.
Purpose of the Study:
- To investigate the molecular mechanisms underlying ethylene-induced adventitious root growth in deepwater rice.
- To identify key genes and cell cycle regulators involved in root development under flooding stress.
Main Methods:
- Treatment of rice with ethylene and other plant hormones (auxin, cytokinin, gibberellin).
- Analysis of root elongation rates and cell cycle progression (S and G2 phases).
- Gene expression analysis of histone H3, cdc2 genes (cdc2Os-1, cdc2Os-2), and cyclin genes (cycA1;3, cycB2;1, cycB2;2).
Main Results:
- Ethylene, but not other hormones, induced adventitious root growth.
- Root elongation was observed 8-10 hours post-submergence.
- Cell cycle activation (S and G2 phases) and specific gene expression (R2, cdc2Os-1, cdc2Os-2, cyclins) occurred sequentially, preceding or during root development.
Conclusions:
- Ethylene plays a pivotal role in deepwater rice adventitious root formation under flooding.
- A coordinated gene expression pattern, including cell cycle regulators, is essential for this adaptive response.
- Ethylene's systemic action suggests early developmental plasticity in root primordia response.