The upper atmosphere has drastically different conditions when compared to the surface of the earth, with heightened radiation and lowered pressures. These atmospheric conditions can mimic conditions on other planets, namely Mars. An experiment was performed to determine how relatively brief exposure(s) to these conditions would affect the growth of Brassica rapa, or mustard seed plants. When compared to other plants of the same species, but exposed to different conditions, the plants that had been fully exposed to the upper atmosphere had similar, but slightly worse growths than the other plant specimens.
Hole, James and Adams, Paul, "Atmospheric Effects on Small Plant Life" (2020). 2020 SACAD Entrants. 35.