but the relationship between FK protein and mRNA does not appear to be linear, e.g. at 32 DAA considerable FK protein is present but almost no FK mRNA is observed (Fig. 3A and B).
These results suggest that FK is strongly regulated at the transcriptional level but the lack of correlation between mRNA and protein suggests that in different organs, like mature petiole, stem or young root, the mRNA could be turned over at different rates, or that FK activity results from the expression of more than one gene.