- Sugars and circadian regulation make major contributions to the global regulation of diurnal gene expression in Arabidopsis. Bläsing, O.E., Gibon, Y., Günther, M., Höhne, M., Morcuende, R., Osuna, D., Thimm, O., Usadel, B., Scheible, W.R., Stitt, M. Plant Cell (2005)