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| Gibberellic acid(GA-3) |
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| Gibberellic acid(GA-3) |
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| Gibberellins are used on agriculture for various purposes. GA-3 is sprayed on seedless grapes to increase grape size and yield, and it also can be used on navel oranges, lemons, blueberries, sweet and tart cherries, artichokes and other crops to adjust fruit set ratio, delay rind aging, etc. These effects are highly dependent on concentration and stage of plant growth. For example, 0.02 micrograms GA-3 promotes flowering of dwarf Ipomoea nil, but 2 - 20 micrograms inhibits flowering. 10 micrograms of GA-3 applied to pea seedlings nearly doubled shoot length if applied at 3 days old, but barely affected 9 day old seedlings. GA-3 and GA-13 trigger female cone formation in almost all taxodiaceae and cupressaceae-- an 8 month old seedling of Sequoiadendron produced a female cone after weekly GA applications. Extremely small amounts of GAs may cause effects- as little as 2 nanograms (billionths of a gram) can trigger cone formation in a cupressus arizonica shoot-tip. The Pinaceae do not form cones with GA-3, but need GA-4, 7 & 9. This property is used to speed up tree-breeding programs. GA is used to trigger flowering of sweet potatoes in breeding programs, to help tomatoes set fruit at high temperatures in the tropics, & to stimulate flowering in the Araceae, such as in breeding taro. GA-3 applied to seed of Chinese cabbage overcomes the need for chilling or long days to trigger flowering, so is used in the tropics for breeding |
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White or buff crystal powder
Melting point is 223-225℃, It can easily dissolve in ethanol, acetone. slightly solubility in water (5g/L)or chloroform. It is high stable in acidic solution or litmusless solution. |
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