|Authors: ||L.N. Mander, D. Camp, L.T. Evans, R.W. King, R.P. Pharis, M. Sherburn, B. Twitchin|
|Keywords: ||Gibberellins (GAs), Modified gibberellins, Lolium temulentum, Flowering, Growth inhibition, Functional specificity|
More than 90 naturally occurring gibberellins (GAs) have been identified, and although many of these compounds are clearly biosynthetic precursors or catabolites of the physiologically active derivatives, it is assumed that the structural variations are associated with a diversity of function.
A systematic search for structural patterns which specifically elicit a flowering response using the long day plant, Lolium temulentum, as a primary screen, has led to the discovery of two new families of GAs with promising biological properties.
Members of the first of these families (16,17-dihydro GAs) generally promote flowering with reduced vegetative growth, and in some cases, growth is actually inhibited.
The second family of GAs (in which the ring D substituents are modified more extensively) inhibit growth more strongly, and in some cases, flowering as well.
The new GAs may be prepared efficiently from commercially available fungal GAs.
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