Question

Use the pressure-flow model to explain what is likely to happen to water, pressure and solute potential in the following scenarios and how that is likely to affect sugar transport in the phloem:

a. Potatoes rapidly growing and accumulating starch.

b. An Arabidopsis thaliana mutant homozygous for a loss-of-function mutation in the sucrose-H+ transporter SUC2.

c. A plant watered with salty water accumulating higher than normal levels of Na+ and Cl- ions in the root xylem.

d. A plant in which all emerging fruit are removed.

e. Potential adaptation(s) in Sea Asparagus (Salicornia virginica) growing on BC ocean beaches to get sugar to move from photosynthetic leaves to non-photo-synthetic leaves. These plants transport Na and Cl ions in the xylem and secrete it from leaves.

Answer 1