- Photosynthesis and fluorescence quenching, and the mRNA levels of plastidic glutamine synthetase or of mitochondrial serine hydroxymethyltransferase (SHMT) in the leaves of the wild-type and of the SHMT-deficient stm mutant of Arabidopsis thaliana in relation to the rate of photorespiration. Beckmann, K., Dzuibany, C., Biehler, K., Fock, H., Hell, R., Migge, A., Becker, T.W. Planta (1997)