Join Emma the Space Gardener as she explores gardening on Earth… and beyond! In this episode, Emma recaps the latest space plant news and then talks about some of the seeds with space stories.
Sweet Potatoes in Space
21.08.2023 - 11:40 / theunconventionalgardener.com / Emma Doughty
The long weekend has given me the chance to have a little play with video today, and this is the result.
It is inspired by a 2009 press release from the American Society for Horticultural Science (ASHS):
Because of the distinct lack of grocery stores in outer space, scientists are looking for ways to provide food for long-term space missions.
Desmond G. Mortley and colleagues from the Center for Food and Environmental Systems for Human Exploration of Space, G.W. Carver Agricultural Experiment Station, and the Kennedy Space Center undertook a study on microgravity’s effects on sweetpotato. The study findings were published in the Journal of American Society for Horticultural Science.
Seeds of several crops have been grown in microgravity, but this was the first test for plants grown from cuttings. Cuttings grow roots faster than do seeds, and sweetpotato cuttings regenerate very easily. This made them ideal for the study, half of which took place on a 5-day space mission on the shuttle Columbia.
The other half of the cuttings remained on earth as the ground-based control group at Kennedy Space Center in Florida. Conditions were similar for both growing environments.
Both environments resulted in similar root growth development, though the microgravity roots tended to grow perpendicular to the cuttings. The number of roots was almost the same in both samples. However, the length of roots grown in microgravity was significantly greater. Microgravity cuttings contained significant accumulation of soluble sugars and higher starch concentration than ground cuttings; the starch grains appeared smaller in microgravity samples.
Despite these differences, the study was successful in showing that stem cuttings, at least those started in
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