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Gibberellic acid

Plant Growth Regulators > Gibberellic acid

chemical name:(1a,2b,4aa,4bb,10b)-2,4a,7-trihydroxy-1-methyl-8-methylenegibb-3-ene-1,10-dicarboxylic acid 1,4a-lactone
Molecular weight:346.4
Molecular formular:C19H22O6
CAS Number:77-06-5
Mode of action:Acts as a plant growth regulator on account of its physiological and morphological effects in extremely low concentrations. Translocated. Generally affects only the plant parts above the soil surface.
Uses:Has a variety of applications, e.g. to improve fruit setting of clementines and pears (especially William pears); to loosen and elongate clusters and increase berry size in grapes; to control fruit maturity by delaying development of the yellow colour in lemons; to reduce rind stain and retard rind ageing in navel oranges; to counteract the effects of cherry yellows virus diseases in sour cherries; to produce uniform seedling growth in rice; to promote elongation of winter celery crop; to induce uniform bolting and increase seed production in lettuce for seed; to break dormancy and stimulate sprouting in seed potatoes; to extend the picking season by hastening maturity in artichokes; to increase the yield in forced rhubarb; to increase the malting quality of barley; to produce brighter-coloured, firmer fruit, and to increase the size of sweet cherries; to increase yields and aid harvesting of hops; to reduce internal browning and increase yields of Italian prunes; to increase fruit set and yields of tangelos and tangerines; to improve fruit setting in blueberries; to advance flowering and increase the yield of strawberries; and also a variety of applications on ornamentals. Application rates up to 80 g/a per application, depending on desired effect.
Physical chemistry:Form Crystalline solid. M.p. 223-225 ºC (decomp.) Solubility In water 5 g/l (room temperature). Soluble in methanol, ethanol, acetone, and aqueous alkalis; slightly soluble in diethyl ether and ethyl acetate. Insoluble in chloroform. Potassium, sodium, and ammonium salts: Readily soluble in water (potassium salt 50 g/l). Stability Dry gibberellic acid is stable at room temperature, but slowly undergoes hydrolysis in aqueous or aqueous-alcoholic solutions, DT50 (20 ºC) c. 14 d (pH 3-4), 14 d (pH 7). In alkalis, undergoes a rearrangement to less biologically-active compounds. Decomposed by heat. pKa 4.0
Mmmalian toxicology:Oral Acute oral LD50 for rats and mice >15 000 mg/kg. Skin and eye Acute percutaneous LD50 for rats >2000 mg/kg. Non-irritating to skin and eyes. Inhalation No ill-effect on rats subjected to 400 mg/l for 2 h/d for 21 d. NOEL (90 d) for rats and dogs >1000 mg/kg diet (6 d/w). Toxicity class WHO (a.i.) III (Table 5); EPA (formulation) III
Ecotoxicology:Birds Acute oral LD50 for bobwhite quail >2250 mg/kg. Acute oral LC50 >4640 mg/kg. Fish LC50 (96 h) for rainbow trout >150 ppm.
1) crystal powder:80%,90%,93%,95%
2) emulsion concertrate:4%,6%
3) tablet:10%,16%,20%
4) soluble powder:3.1%,10%,20%
5) gibberellin paste:2.7%
6) apple caretaker 3.6%GA4.A7+6BA
7) GA4.A7 tech:90%
Packing: 1kg/tin,5kg/tin,25kg/drum,180L/drum,or according to customer's requirements.