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Ground-based studies with Super-Dwarf wheat in preparation for space flight.
F B Salisbury1, L S Gillespie, W F Campbell
1Plants, Soils, and Biometeorology Department, Utah State University, Logan 84322-4820, USA.
Journal of Plant Physiology
|September 7, 2001
Summary
Super-Dwarf wheat growth in space experiments showed retarded development under low light, but head formation occurred. Heat stress and disinfectants had specific effects, while plant hormones did not alter height, indicating it
Area of Science:
- Plant physiology
- Space biology
- Agricultural science
Background:
- Wheat cultivation in controlled environments, such as space stations, requires understanding plant responses to altered parameters.
- Previous space experiments have provided insights into plant growth under microgravity and other conditions.
Purpose of the Study:
- To evaluate the performance of Super-Dwarf wheat (Triticum aestivum L.) under simulated and actual spaceflight environmental conditions.
- To determine the effects of light intensity, photoperiod, heat stress, water disinfectants, and plant growth regulators on wheat development.
Main Methods:
- Wheat cultivar Super-Dwarf was subjected to varying photosynthetic photon flux (PPF), photoperiods, and heat stress (40°C).
- Effects of iodine and silver-fluoride disinfectants in water, and gibberellic acid (GA3) or indoleacetic acid applications were assessed.
- Plant development, flowering, head formation, and height were monitored under different experimental conditions.
Main Results:
- Low PPF (40-400 µmol m⁻² s⁻¹) retarded development and head formation, with plants dying before maturation under extreme low light.
- Longer photoperiods promoted flowering; night interruptions did not induce a long-day response.
- Heat stress at 40°C affected flowering and killed older plants (13-16 days old).
- Disinfectant concentrations up to 4.0 mg L⁻¹ had no effect, but higher levels were inhibitory.
- GA3 and indoleacetic acid treatments did not alter plant height, suggesting insensitivity in this cultivar.
Conclusions:
- Super-Dwarf wheat can initiate head formation even under very low light, though maturation is compromised.
- Photoperiod influences flowering, but the response differs from typical long-day plants.
- The cultivar exhibits tolerance to moderate heat stress and certain disinfectant levels.
- The lack of response to GA3 and indoleacetic acid suggests it is not a gibberellin mutant.