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What's plant growth regulators are require at different stages of fruit tree planting?

Date: 2023-03-06 19:00:07
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What's plant growth regulators are require at different stages of fruit tree planting?

1. Promote or delay bud germination
The use of gibberellin (GA) in fruit tree production can break the dormancy of seeds or buds of certain tree species, promote germination, shorten the treatment time of seeds, thereby advancing the germination time and improving the germination rate.

The use of growth regulators such as NAA( naphthalene acetic acid) can also extend the dormancy time of buds, thereby inhibiting or delaying the germination of buds, and can be applied to the storage of fruit tree seeds or scions.

2. Promote the rooting of fruit trees
In the production of fruit trees, use appropriate concentrations of auxin plant regulators such as indole acetic acid (IAA), indole butyric acid (IBA), and naphthalene acetic acid (NAA) to treat scions or seedlings, or directly use Pinsoa Root King to promote the root growth of fruit trees, increasing the number of roots.

3. Regulate nutritional growth
In the production of fruit trees, the use of growth retardants such as paclobutrazol (PP333) and chlormequat (CCC) can delay or inhibit the growth of new shoots, causing the plant to show physiological dwarfing without damaging the apical meristem of the plant. Affects plant development. control the excessive vegetative growth of the tree Effectively, shortening the internodes, thickening the stems, dark green leaves, thickening the leaves, increasing the number of branches, and developing the root system. It can be used to dwarf the tree or adjust the shape of the tree.

4. Regulate flower bud differentiation and flowering period
The use of paclobutrazol (PP333), ethephon and other growth regulators in many tree species such as peach can significantly inhibit the excessive vegetative growth of the tree, promote the formation and differentiation of flower buds, increase the number of flower bud differentiation, and promote flowering, thereby making the fruit tree ripe early and improved fruit setting rate.

Use gibberellins (GA) at various stages of fruit tree flower formation can reduce the number of flower buds effectively or inhibit the differentiation of flower buds, achieve the purpose of reduce flowers, save labor, overcome problems such as balance the size of fruit  and production.

Plant growth regulators can also regulate the sexual differentiation of flowers. Applying an appropriate concentration of GA3 during the differentiation period of female flowers of chestnut and other fruit trees can significantly increase the differentiation rate of female flowers and reduce the ratio of male flowers to female flowers. If an appropriate concentration of ethephon is used, the differentiation rate of male flowers will be increase and the ratio of male flowers to female flowers will be increase.

5. Adjust the fruit setting rate of fruit trees
Spraying plant growth regulators such as gibberellin (GA) before or during the flowering period of fruit trees can increase the fruit setting rate of various fruit trees. Applying an appropriate concentration of naphthalene acetic acid (NAA) at a certain time before fruit harvesting can prevent preharvest fruit drop in pome fruits, stone fruits, dates and other fruit trees, and increase the production of fruit trees.

6. Improve fruit quality
In fruit tree production, plant growth regulators are often use to improve fruit quality. Use GA3 or cytokinin substances in the young fruit stage to promote fruit size or lengthen the fruit. Applying different plant growth regulators at different stages from fruit tree flowering to fruit maturity can improve the fruit shape index, color index, and nutrient content of various fruits, making the fruit beautiful in shape, rich in nutrients, and increasing the commercial value of the fruit.

7. Regulate the ripening period of fruits
Ethephon is a commonly use ripening agent. In production, ethephon is often used to ripen the fruits of various fruit trees, promote the rapid growth of the fruits, and make the fruits mature in advance, so that they can be harvest in advance and put on the market in advance, increasing the price of the fruits and increasing the Economic benefits.
 The use of growth regulators can also delay the ripening of certain fruit trees. For example, spraying an appropriate concentration of GA3 or salicylic acid can increase the hardness of the fruit, inhibit the synthesis of ethylene in the fruit, delay the ripening time of apples and other fruits, and thus delay the time to market o, which will help increase the price of fruits.

8. Inducing parthenocarpy

Some plant growth regulators such as auxins and gibberellins can promote plant development. In production, IAA or GA3 are often used to treat some fruit trees to induce parthenocarpy of some fruit trees, produce seedless fruits, and improve the quality of the fruits, thus improving the quality of the fruits and economic benefits.

9. Improve the stress resistance of fruit trees
The use of plant growth regulators such as ethephon can improve the cold resistance and frost resistance of apples and other fruit trees, allowing many northern fruit trees to survive in winter safely and avoid frost damage.
10. Application to tissue culture of fruit trees
In the process of fruit tree tissue culture, according to the characteristics of tissue culture seedlings at different growth stages, the use of appropriate plant growth regulators such as auxin, cytokinin, and gibberellins can effectively induce callus formation and proliferation and promote rooting, to prevent browning or vitrification of tissue culture seedlings.

11. Assist in mechanical harvesting of fruits
Spraying ethephon is an auxiliary method for mechanical harvesting of jujube, plum and other fruit trees. A period of time before normal harvesting, such as jujube, spray 200-300mg/L ethephon 5-6 days ago, pull a net under the tree, and the fruits will naturally fall into the net, reducing the manpower in the fruit harvesting process.

12. Storage and preservation of fruits
The use of plant growth regulators such as ethylene inhibitors to treat fruits can protect color, preserve freshness, reduce consumption and enhance storage stability, extend the shelf life of fruits and increase economic income.
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