Higher plants gibberellin biosynthesis

Gibberellin Biosynthesis in the Fungus Gibberella fujikuroi and in Higher Plants... 

Graebe, J.E., Hedden, P., Gaskin, P-, MacMillan, J. "The biosynthesis of a C -gibberellin from mevalonic acid in a cell-free system from a higher plant." Planta, 197, 120,... 

Remarkably, the same compound can be produced in different ways by different organisms. The best known example is probably the polyketide anthraquinone, chrysophanol 9, which occurs in both eukaryotes (higher plants, lichens, fungi and insects) and prokaryotes, but is produced through different folding modes of polyketide chains.10 Similarly, it has also been demonstrated that the biosynthesis of gibberellins involves different metabolic sequences in fungi and plants.11... 

Thus, phenolic compounds and morphactin - which inhibit cell elongation and cell division in higher plants -have no effect on biosynthesis of auxins and gibberellins in cultures of certain fungi. Their action seems to specific for higher plants. 

Most work on GA biosynthesis has utilised cell-free systems from immature seed tissues (endosperm and cotyledons), which contain much higher GA concentrations than those present in other parts of the plant [2]. Such systems have been particularly useful for characterizing the enzymes involved in GA biosynthesis, but, since the function of GAs in these tissues is unknown, it has not been possible to relate the biosynthesis to any physiological processes. Moreover, the endogenous GAs and their metabolism in immature seeds are often atypical of other plant tissues. Gibberellin production is also... 

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