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Excess copper induced physiological and proteomic changes in germinating rice seeds
Nagib Ahsan1, Dong-Gi Lee, Sang-Hoon Lee
1Department of Animal Science and Biotechnology, College of Agriculture and Life Sciences, Kyungpook National University, Daegu 702-701, Republic of Korea.
Chemosphere
|December 22, 2006
Summary
High copper levels harm rice seed germination by causing oxidative stress and disrupting essential metabolic enzymes. Proteomic analysis revealed changes in antioxidant and stress-related proteins, impacting seed development.
Area of Science:
- Plant Biology
- Environmental Toxicology
- Biochemistry
Background:
- Copper is essential for plants but toxic at high concentrations.
- Heavy metal effects on germination proteins are poorly understood at the proteomic level.
- Understanding copper toxicity mechanisms is crucial for agriculture.
Purpose of the Study:
- Investigate physiological, biochemical, and proteomic changes in germinating rice seeds under copper stress.
- Identify proteins affected by excess copper during germination.
- Correlate molecular changes with observed physiological effects.
Main Methods:
- Rice seeds were exposed to varying copper concentrations (0.2mM to 1.5mM).
- Physiological parameters (germination rate, shoot elongation, biomass, water content) were measured.
- Proteomic analysis using SDS-PAGE, 2-DE, and MALDI-TOF mass spectrometry identified differentially expressed proteins.
Main Results:
- Copper stress significantly decreased germination, shoot elongation, biomass, and water content.
- Increased copper and TBARS content indicated oxidative stress.
- 25 differentially expressed proteins were identified, including up-regulated antioxidant/stress proteins and down-regulated metabolic enzymes (e.g., alpha-amylase, enolase).
Conclusions:
- Excess copper induces oxidative stress in germinating rice seeds.
- Down-regulation of key enzymes inhibits reserve mobilization and seed germination.
- Proteomic insights correlate with physiological and biochemical changes, revealing copper toxicity mechanisms.
