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Ultrastructural correlates of anaerobic stress in corn roots
Abstract:
Cytological events in Zea mays root meristem were followed during 26 hr of anaerobic treatment. From 8 to 14 hr, mitochondria swelled drastically, Golgi apparatus actively produced vesicles, endoplasmic reticulum proliferated, and chromatin strongly condensed. Plastids appeared normal. By 26 hr, however, Golgi activity receded, mitochondria assumed long, polymorphic shapes, chromatin partly dispersed, and plastids swelled. ER remained prominent, and the cytoplasm contained long fibrous inclusions. This preliminary study emphasizes the need to examine quantitatively all cellular organelles periodically for longer periods when following events of stress or pathology. Our observations corroborate scattered reports in the literature for single organelles under anaerobic stress and represent the first set of correlated observations on the entire spectrum of cellular events.
Insights
Anaerobic stress in Zea mays root meristem causes significant cellular changes, including mitochondrial swelling and endoplasmic reticulum proliferation. These cytological events highlight the importance of studying cellular responses to stress.
Area of Science:
- Plant Biology
- Cell Biology
- Stress Physiology
Background:
- Understanding cellular responses to environmental stress is crucial for plant survival.
- Anaerobic conditions induce significant physiological challenges in plants.
Purpose of the Study:
- To investigate the cytological events in Zea mays root meristem under prolonged anaerobic treatment.
- To provide a comprehensive, correlated observation of cellular organelle changes during anaerobic stress.
Main Methods:
- Observation of Zea mays root meristem cells.
- Treatment with anaerobic conditions for 26 hours.
- Microscopic analysis of cellular organelles including mitochondria, Golgi apparatus, endoplasmic reticulum, chromatin, and plastids.
Main Results:
- Early anaerobic stress (8-14 hr) induced mitochondrial swelling, Golgi vesicle production, ER proliferation, and chromatin condensation.
- Later anaerobic stress (26 hr) showed Golgi activity recession, polymorphic mitochondria, chromatin dispersal, and plastid swelling.
- Endoplasmic reticulum remained prominent with fibrous inclusions in the cytoplasm.
Conclusions:
- Cytological changes in Zea mays root meristem are dynamic and time-dependent under anaerobic stress.
- This study provides the first correlated observations of multiple organelles under anaerobic stress.
- Quantitative, periodic examination of all cellular organelles is essential for understanding stress and pathology in plants.