Figure 1.

Calcium-spiking patterns in a pea root hair injected with Oregon Green and exposed to R. leguminosarum bv. viciae Nod factors. The traces are taken from one root-hair experiment and show the typical pattern observed (10 individual cells examined from 10 root sections). Measurements were taken from the nuclear region of the hair. Each trace represents data collected from 60 images, one image taken every 5 s. The time label on each trace indicates when the first image for that set was taken relative to the addition of Nod factor. Nod factor was added immediately after the last image of the pre-Nod-factor data set was taken.