The kinetics of 14C incorporation into
glycolate was studied after changing the export of photosynthetic products from
the leaf. It has been shown that the ribulose-bisphosphate-oxygenase
pathway of glycolate formation works in the stationary state of the plant.
An excess of photosyntates or a decrease in the amount of light primary
products, as well as nitrates in the leaves, immediately turns on the
transketolase pathway of glycolate formation. In this case, part of the oxygen formed in the photochemical reactions
of chloroplasts ceases to be released from the leaf. After oxygen
receives an electron from ferredoxin in the electron transport chain of
chloroplasts, it starts (through photorespiration) the formation of
non-carbohydrate photosyntates and metabolic processes in the cytoplasm. It was
concluded that the main function of photorespiration
in the regulation of photosynthesis is maintaining a balance between
light and dark processes of photosynthesis on change of living conditions.
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https://doi.org/10.1007/s10535-006-0122-1
