Related Experiment Videos
Pollination and embryo development in Brassica rapa L. in microgravity
1Department of Plant Pathology and Crop Physiology, Louisiana State University Agricultural Center, Baton Rouge 70803, USA.
International Journal of Plant Sciences
|April 25, 2000
Summary
Plant reproduction in microgravity showed no absolute gravity dependence, but lower embryo quality was observed in Brassica rapa L. spaceflight studies. Subsequent generations showed no differences, indicating microgravity
Area of Science:
- Plant reproductive biology
- Space biology
- Gravitational biology
Background:
- Plant reproduction is crucial for agriculture and has faced challenges in spaceflight.
- Understanding microgravity's effects on plant reproduction is vital for long-duration space missions.
Purpose of the Study:
- To investigate the impact of microgravity on pollination and embryo development in Brassica rapa L.
- To identify specific stages of reproductive development affected by spaceflight conditions.
Main Methods:
- Brassica rapa L. plants were grown and hand-pollinated during a 16-day space shuttle mission (STS-87).
- Parabolic flights confirmed pollen collection and transfer feasibility in microgravity.
- Embryo development, viability, and storage reserves were assessed and compared to ground controls.
Main Results:
- Pollen viability in spaceflight was comparable to ground controls (93%).
- Embryos from space-flown plants showed a 12-day developmental lag compared to ground controls at 15 days post-pollination.
- Storage reserves (carbohydrates, proteins) in embryos were similar between spaceflight and ground treatments.
Conclusions:
- No stage of Brassica rapa L. reproductive development is absolutely dependent on gravity.
- Microgravity can lead to reduced embryo quality during development.
- Subsequent generations did not exhibit differences, suggesting potential for recovery or adaptation.