Subject: Why higher temperatures increase the release of pigment from a vacuole

Do higher temperatures increase the rate of pigment secretion because the 
lipids in the phospholipid are broken down under the heat? Is another reason 
for this release of pigment the breaking down of the proteins in the tonoplast?
I am writing up an analysis of an experiment showing how beetroot cells give 
out more pigment as they are heated. (I am also wondering if the structure of a 
tonoplast is the same as that of the plasme membrane). It would be much 
appriciated if you could clarify my ideas, so that I could better understand 
the process of pigment secretion (and membrane structures).
Thanks. 

Re: Why higher temperatures increase the release of pigment from a vacuole