Effects of 17-alkyl-16,17-dihydrogibberellin A(5) derivatives on growth and flowering in Lolium temulentum.
Several gibberellins in which the 16-methyl group of the 16-epimers of dihydro-GA(5) had been replaced by ethyl, n-propyl and n-butyl were prepared and tested at doses of 1, 5 or 25&mgr;g per plant for their effects on stem growth and flowering of the grass Lolium temulentum. The ethyl and n-propyl derivatives were most inhibitory of elongation, the exo-isomers being more active than the endo-forms. While both isomers of dihydro-GA(5) promoted flowering, among the 17-alkyl analogues, only the exo-ethyl derivative showed significant activity.
N Mander
Lewis
L
Research School of Chemistry, Australian National University, A.C.T. 2601, Canberra, Australia
Adamson
George
G
Bhaskar
Vijaya K.
VK
Bruce Twitchin
Camp
David
D
King
Rod W.
RW
Evans
Lloyd T.
LT