FIG. 7.

Photographs of living seedlings in an additional ground control (GR-dish), which were grown in Petri dishes in darkness in standard laboratory conditions with an open atmosphere. The seedlings are comparable to the samples in the PDFU ground control (Fig. 5) in that they exhibited similar growth and the roots showed a slight skew to the left of the Petri dish. The diameter of the Petri dish is 60 mm, and the gravity vector is toward the bottom of the image. (Note that this image is of living seedlings, whereas seedlings shown in Fig. 5 have been fixed.)