Gibberellin.

。a class of plants
hormone
. GA
for
. Initially isolated from the erythromycin secretions that cause rice germdisease, and then from higher plants and
gills
to isolate a lot of erythromycin, there are now more than
70
kinds. In accordance with the order of separation, respectively named
GA
1


,
GA
2
.... These erythromycin have a common basic skeleton in the chemical structure, called erythromycin, which differs in that the total number of carbon atoms is different (
C
19 ,
C
20two types), the number and position of erythromycin rings are different, and there is no internal ester. Different erythromycin has different biological activity, while different plants or different processes of growth and development, such as the elongation of stems, seed germination, flowering, etc., also show different sensitivity to different erythromycin.
GA
3
(i.e., erythromycin) has high activity and is widely used in production in China. Its pure products are white crystalline, insoluble in water, soluble in ethanol, acetone and esters. In general, there are at least two or more kinds of erythromycin in plants, and different erythromycin can change from one another. Erythromycin in higher plants is mainly synthesized in immature seeds, nutrient buds, young leaves, root tips and so on. Synthesis is slow to degrade in the body, but easily combined with sugar,
protein
to become a binding state, it is a form of storage of erythromycin. Erythromycin stimulates the elongation and growth of stems, especially for genetic dwarfing. In addition, there is the role of breaking sleep, promoting germination, inducing flowering, promoting fruit growth, inducing the synthesis of α
-
amylase,
protease
and so on.

。
。