Results of the TROPI-2 experiment were published in April 2012 in the Online First Edition of Planta (http://www.springerlink.com/content/wq61621488n52703/)
, an International Plant Biology Journal. The title of the article is Phototropism of Arabidopsis thaliana in microgravity and fractional gravity on the International Space Station authored by Drs. John Z. Kiss, Katherine D. L. Millar and Richard E. Edelmann, Miami University, Oxford, Ohio. The experiment was funded by NASA, developed by ARC, and performed on the ISS in the EMCS. The paper is of unique scientific interest in that it is the first report examining the behavior of flowering plants in fractional gravity, compared to behavior in microgravity and at 1g. In the long-term, these experiments have implications for growing plants in fractional gravity environments such as those on the Moon and Mars.
Figure Above: Images of seedlings from the space experiments illustrating positive red-light phototropic curvature in the stem-like hypocotyls of seedlings in microgravity. Uni-directional red light was provided from the left side. Arrows indicate hypocotyls bending toward the red. (a) Beginning of the stimulation phase (b) Approximately 24 h after the start of red light.