who investigated role of water and solutes in order to display phototropism, what did they do, what did this prove?
Boysen-Jensen (1913) inserted a sheet of mica (impermeable to water) through the shaded side of coleoptile. There was no curvature response. They then inserted it into the light side of the shoot tip and there as a curvature response. They then cut the tip off and placed a block of gelatine (permeable) between the stem and shoot tip. Normal curvature response was seen?
This proved water and solutes need to be able to move backwards from the shoot tip to display phototropism.