Gibberellic acid

Gibberellin A3

Colorless crystals

Fixed

1.34 g · cm (20 ° C ) -1

223-225 ° C ( decomposition)

4.0

• Poorly in water (5 g · l-1 at 25 ° C)
• Well in ethanol ( 125 g · l-1 at 25 ° C)

Attention

6300 mg · kg -1 ( LD50, rat, oral)

Template: Infobox chemical / molecular formula search available

Gibberellic acid ( GA) is a plant growth hormone ( phytohormone ) and the best-known representative of the group of gibberellins. It is a diterpenoid carboxylic acid. Gibberellic acid promotes germination and germination speed, has an influence on the growth in length and the fertilization of the vascular plants, emphasizing the hibernation on. In higher concentrations GAs influence in the protonema of mosses Gravitropism and linear growth. As shown in Physcomitrella patens, are already to be found in these plants, individual members of the GA signal line. Produces the gibberellic acid in the plastids of young leaves, as well - to promote the maturation - in immature seeds and fruits.

In viticulture, it is applied to the vines to combat Essigfäule. In horticulture it is used as a seed help to trigger the immediate germination hard -or cold- germinating plants. Also, gibberellic acid can be used to make feminized cannabis seeds, female plants are removed through the use of gibberellic acid for self-fertilization by.

History

Gibberellic acid was first in 1935 by Teijiro Yabuta at the University of Tokyo as a secondary metabolite of rice harmful fungus Gibberella fujikuroi ( Fusarium moniliforme ) identified that causes excessive growth of young rice seedlings.