GIBBERELLIC acid (gibberellin A3) has been shown to be active in setting parthenocarpic fruit in Rosa1,2. The relative activity of gibberellins A1, A3, A4, A5, A8 and A9 in this respect was determined in April 1962 with two clones of R. spinosissima growing in a cool greenhouse, by cutting off the ‘disk’ (carrying with it the calyx, corolla, stamens and stigmas) from unopened flower-buds and applying the gibberellins in 1 µl. of 25 per cent ethanol to the cut surface. This gave better results than injecting the solution into the cavity of the receptacle. Controls, in which ethanol alone was used, abscissed within 2 weeks. An average of c. 15 buds (with individual tags) was used for each treatment and their growth in diameter was compared with that of a sample of 104 normal buds, by measurement at 2-weekly intervals. With A3, quantities ranging from 0.01 to 10 µg per bud were used: with the other gibberellins, 0.1 and 1.0 µg per bud.
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JACKSON, G., BLUNDELL, J. Relative Effectiveness of Different Gibberellins in the Induction of Parthenocarpic Development in Rosa. Nature 202, 1027–1028 (1964). https://doi.org/10.1038/2021027a0
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