Effect of gibberellin on hawthorn growth and development 5

The site of gibberellin synthesis is mainly immature seeds; The main function is to promote cell elongation and growth, thereby causing plant heightening, promoting seed germination and fruit development. After the plant is infected with gibberellin, there will be a phenomenon of crazy growth of plants, the diseased plants are often much taller than normal plants, because the nutrients supplied to the plants are certain, so the seedlings will consume more nutrients, for some plants, this will cause a decrease in seed setting rate. However, in practice, the use of gibberellin in some plants can often promote their growth, promote fruit development, and reduce production costs.

However, if the plant growth regulator on the fruit and vegetable residue is excessive, it will often cause harm to the human body, and it is necessary to comprehensively consider the purpose of application, the effect of the drug, the toxicity of the drug, the residue of the drug, and whether the application is convenient. Remember to properly control concentrations and use times.

Spraying gibberellin during the flowering period of hawthorn trees can greatly improve the fruit setting rate, reduce flower and fruit drop, and significantly increase the weight of single fruit, early ripening and improve fruit quality.

1. Keep flowers and fruits.

Spraying gibberellin during the flowering period of hawthorn trees can greatly improve the fruit setting rate, reduce flower and fruit drop, and significantly increase the weight of single fruit, mature early and improve fruit quality. According to the experiments in Liaoyang City, Liaoning Province and Huixian County, Henan Province, spraying gibberellin 50 60ppm at the flowering stage increased the fruit setting rate compared with the control, increased the weight of a single fruit by grams, and increased the vitamin C of the fruit. Fruit hardness is reduced, and the coloring and ripening period can be advanced by 5-10 days.

Hawthorn spraying gibberellin from the first flowering stage to the last flowering stage can be effective, and the spraying effect is best at the full flowering stage. The spraying concentration should be changed according to the number of flowers, in large years with many flowers, gibberellin is generally sprayed with 30 40ppm, and in small years with few flowers, gibberellin is sprayed with 50 75ppm. Register.

The flowering period of hawthorn is short, generally only 4 to 5 days, so it is necessary to prepare the medicine in advance and prepare for spraying; When spraying, it is best to choose a sunny day when there is no dew, and pay attention to the uniform spraying of the liquid. If there is heavy rain within 6 to 24 hours after spraying, it should be sprayed; Hawthorn treated with gibberellin will have some seedless fruits, and the grandson recommends that gibberellin should not be sprayed for seed retention.

2. Increase the hawthorn fruit and improve the quality grade of hawthorn.

Gibberellin not only increased the fruit setting rate of hawthorn, but also increased the fruit shape and single fruit weight. According to the experiment, spraying gibberellin 20 100ppm at the full flowering and young fruit stage increased the average single fruit weight by 20 25%, and the maximum weight gain was 59%. 20 50ppm is generally used in production, and the effect is better when used with fertilizer.

Gibberellin does not cause any harm to human health.

Gibberellin is a plant hormone, which has no corresponding binding receptor in the human body, and a small amount of gibberellin is not harmful to the human body. Plant hormones are produced by the plants themselves, lower concentrations promote growth, higher concentrations inhibit growth, and different organs of plants have different requirements for the optimal concentration of auxin.

The most significant physiological effect of gibberellin is to promote the growth of plants, which is mainly to promote the elongation of cells. The most significant effect of gibberellin on plants is to promote stem elongation and increase plant height. Just take a trace amount of gibberellin (a0.).

5 mg) can cause rapid growth of plants when applied to the growth point of plants at one time, and the degree of response often varies with the plant species and varieties.

1. The effect of gibberellin, especially GA3 (such as 92O), has been recognized in many years of use, but it also causes excessive growth of branches and leaves, affecting flower bud differentiation and flower and fruit growth, and is easy to produce obvious fruit tree size, weak flowers and fruits, rough peel, less pulp juice, and pulp fibrosis. If there are unfavorable climatic conditions such as drought after the use of 92O, it will also aggravate the damage of fruit trees.

2. Zearalenone is toxic and carcinogenic.

3. Excessive dosage has a yield reduction effect on seeded grapes, especially female flower varieties and fruits with fewer seeds4, and gibberellin is very toxic to animals. The high-dose test of intravenous injection of LD50> and oral LD50>25g kg in rats showed no toxic reaction. (Of course, if you have to eat a bunch of poison, it is poisonous, and toxicology teaches us that poisons are actually lethal in small amounts.)

Big.

Gibberellin can promote cell elongation, stem elongation, leaf expansion, and promote parthenogenesis and fruit growth, break seed dormancy, change the ratio of female and male flowers, affect flowering time, and reduce flower and fruit shedding. Exogenous gibberellin enters the plant and has the same physiological effect as endogenous gibberellin.

Promotes stem elongation and induces flowering in long-day plants in short-day conditions. Various plants have different degrees of susceptibility to gibberellin. In conclusion, gibberellin has a twofold effect, both promoting and inhibiting growth. Different concentrations have different effects.

Although hawthorn trees bloom more, but the fruit setting rate is low, generally only about 10%, spraying "ninety-two o" during the flowering period can increase the fruit setting rate by 20%, increase the yield by 30%, and promote the fruit to ripen in advance for 7 10 days. Its application method is as follows:1

Time. The spraying time is in full flowering, generally spraying 2 times, and the full flowering period in Chengde area is on May 26 and 30. When 70% of the flowers in the whole garden are open, spray 1 time, and spray the remaining flowers 1 time, in case of rain, it should be sprayed in time.

2.Spray concentration and preparation method. Before spraying, dissolve "92O" with an appropriate amount of alcohol or liquor, and then pour a certain amount of water, stir evenly, and the concentration is generally 10,000 times (50 70 mg kg).

When spraying, it must be meticulous and comprehensive, with the inflorescence dripping as the degree. 3.Precautions.

When using "92o", the integrated management of hawthorn trees, especially the management of soil, fertilizer and water, should be strengthened to enhance the tree potential. When the large tree flowers are large during the full fruit period, under the condition of good fertilizer and water conditions, spray 50 mg kg of "92O" once twice after flowering, which can increase the weight of a single fruit and increase the yield well. When the amount of flowers in the young tree is small, it is advisable to spray 50 mg kg of "92O" during the full flowering period and two weeks after the flowering fall.

Search it: 920 pesticide use of hawthorn.

Promote plant growth, promote seed germination, promote fruit setting and growth, promote lateral bud growth, and promote male flower formation.

Strawberries can be treated with gibberellin, a plant growth hormone; It has been widely used in the cultivation of hawthorn, flowers and strawberries.

Gibberellin is used in agricultural production and has good effects in some aspects. For example, increasing the yield of seedless grapes and breaking the dormancy of potatoes; In brewing beer, GA3 is used to promote the germination of barley seeds for maltose preparation; When the heading of late rice is slow due to rainy and low temperature, gibberellin treatment can promote heading. or adjusting the flowering period in hybrid rice seed production so that the parents meet in their own flowering period, etc. However, excessive use of gibberellin will cause the plant cell wall to thin and elongate, and the external manifestation is elongation, which will reduce the lodging resistance of the stem.

Gibberellin is an endogenous growth hormone of plants, which will produce a small amount of gibberellin at the top of the growth of any plant, so a moderate amount of gibberellin is not harmful to the plant itself, but will promote plant growth and development. Due to the non-toxicity of gibberellin and the extremely small amount of residues on plants, the trace amount of gibberellin that enters the human body through the use of vegetables and fruits will not cause any harm to human health. On the contrary, it has been reported that taking a moderate amount of gibberellin can cause diseases such as gastric ulcers and damage to the gastric mucosa.