The activity of protein disulfide isomerase, in the extracts of severa
l dormant seeds including soybean, rice, wheat, and maize was assayed.
The activity was higher in the extracts of beans than in those of the
other seeds. A correlation was significant (R=0.95 and 0.93; p<0.01)
between the PDI activity and the concentration of protein soluble in a
salt solution.