The physiological effects of gibberellin are mainly to promote growth.For the young cells of meristem, its function is to promote division.For adult cells, its main function is elongation.Compared with auxin, it has the following functions: it ACTS on the whole plant;Only elongate the stem without increasing the number of nodes can increase the number of nodes only for the stem with intermediate meristem.There was no inhibition under high concentration, but the plant morphology was abnormal when the concentration was too high.Ga3 can promote nutrient transport, break the seed dormancy, inhibit fruit trees blossom, inhibition of flower bud differentiation, promote fruit, fruit mature, promote fruit development, in most cases can inhibit organ senescence;Gibberellin also affects the synthesis and action of other hormones and certain enzymes.
Apple: in order to improve the fruit setting rate, the fruit setting rate can be increased by spraying 25 ~ 100 PPM gibberellin in the blooming period, and the fruit setting rate can be increased by over 27%.
Pear: in order to improve the fruit sitting rate, pear can spray 50 PPM of gibberellin during the first exposure period.Spraying 50 PPM of gibberellin to increase fruit setting rate of pear female flower after freezing;Beijing pear can be sprayed with 25 PPM gibberellin during flowering and fruit growth periods to increase fruit setting rate and yield.
Peach: spraying 20 PPM gibberellin flower can increase fruit setting rate.Spraying 250 ~ 1000 PPM of gibberellin after anthesis can obtain more than 50% unisexual fruiting.Some precocious strains of gibberellin with 100 to 500 PPM were induced to obtain unisexual results.
Grape: spraying 100ppm of gibberellin once every 10 to 20 days before and 10 days after flowering can enable jufeng grape to obtain high yield and high quality seedless fruit. In order to prevent drug harm, it is not necessary to spray.Mix with 800 PPM B9 and 200 PPM gibberellin, spray or dip into the ear to reduce grape rot and granulation.
Haw: spraying 40 ~ 60 PPM of gibberellin during blooming period can induce unisexual fruiting, increase fruit setting rate and increase fruit weight.Seed germination rate can be improved by treating seeds with 500-1000 PPM gibberellin before sand accumulation.
Cherry: sweet cherry flowering spray 50 ~ 200 PPM ga3 + 50 PPM naphthalene acid, spend three weeks after spraying ga3 can delay mature, increase the fruit, reduce dehiscent fruit, increase the resistant capacity, also can make the juice clear, vitamin C content increased;Spraying 50 PPM gibberellin +100 PPM ethylene can increase the cold resistance of flower buds.Soak 1,000 PPM of gibberellin for 12 hours before summer planting to increase the germination rate of hairy cherry seeds.
Jujube: in order to improve fruit setting rate, jinsi jujube can be sprayed with 10-15 PPM gibberellin twice during flowering.Chinese date can be sprayed with 5 PPM of gibberellin during flowering.
Kiwi fruit: put the seeds on the filter paper soaked with gibberellin (500-1,000 PPM) before planting. Add the liquid to moisten the filter paper every day to break the seed dormancy and increase the seedling rate.
Persimmon: the apparent maturity of sweet persimmon after harvest is soaked in gibberellin at 500 ~ 1000 PPM for 3 ~ 12 hours, which can delay the softening for 1 month.The astringent persimmon, when the fruit begins to turn from green to yellow, is sprayed with 25 to 50 parts per million of gibberellin throughout the tree, which can be antiseptic and slow down the softening rate.
Walnut: soak with 100 ~ 200 PPM of gibberellin for 24 hours before planting, shorten the germination time by 3 ~ 5 days.
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