These results suggested a close interaction between plastidial adenylate transport and starch biosynthesis.
Although this general reduction of adenylates concentration might suggest an impaired respiratory process, this seems to be unlikely as AEC was fairly constant throughout drought levels.
Energy-related parameters measured were fermentation end-products (ethanol, lactate, alanine), respiratory rate, ATP, adenylate energy charge, nitrate reductase activity and biomass.
Later, a similar topology was also found for other plastidic transporters, for example, the adenylate translocator and the hexose translocator.
Both the extent and kinetics of changes in the adenylate energy charge in response to low O 2 are used as indicators of tolerance to hypoxia and/or anoxia.