Passwords cannot be legally assigned to any other individuals. The curvature of the coleoptile is thought to be due to a difference between the auxin levels on the two sides of the coleoptile. These results are shown in Figure 19.22 on page 566 . This distribution of auxin toward the shaded side provides a concentration gradient across the coleoptile. This results in differential stimulation of growth.
Growth is more rapid on the shaded side of the coleoptile than on the lighted side.
This is shown in Figure 19.21 on Page 565 . The fact that the lighted side is inhibited compared to dark controls indicates a redistribution of auxin such that the final concentration on the lighted side is less than in dark controls. The differential growth on the two sides of the coleoptile results in its curvature. It has taken many decades of work to figure that out. It turns out that the light signal apparently causes increased synthesis on both lighted and shaded sides.