What are the varieties of delicious seedless grapes? Is it genetically modified? How to cultivate it?

Grapes are rich in potassium, delicious, can be eaten fresh, dried into raisins, can also be squeezed, wine-making, is a good fruit. So what are the varieties of seedless grapes? Is it genetically modified? How to cultivate it? It is understood that seedless grapes are not genetically modified. There are two kinds of seedless grapes, neither of which is genetically modified. One is natural seedless, triploid grape, such as summer black, seedless early red (8611); the other is treated with growth hormone, such as gibberellin in full bloom, seedless Jufeng grape can also be obtained.

What are the varieties of seedless grapes?

Seedless grapes have early summer seedless, ruby, Frey seedless, horse milk, Collison seedless, red seedless, 8612, Bixiang. Naturally, there are no seeds. There are other varieties that can deal with denuclearization. The price of seedless green grapes is 5 yuan per jin. There is also a very small but very sweet grape about 10 yuan per jin.

How to cultivate seedless grapes?

So how to make the seed provide enough hormones for the fruit to promote the fruit development at the same time? There are several methods:

1. Apply a certain concentration of plant hormones to the fruit to inhibit seed development and promote fruit development.

2. by means of hybridization, the seeds can not develop normally, and at the same time, certain stimuli are given, so that the fruit itself can produce enough plant hormones for its development.

3. Seedless grapes can be produced by looking for mutants whose seeds are sterile but can produce plant hormones.

We know that after pistil pollination, the developed seeds synthesize a large amount of auxin in the process of ovule development into seeds. Only under the action of these auxins can the ovary develop into fruit. So how does the ovary of these seedless fruits develop into fruits? This is due to the fact that these varieties synthesize more auxin in the ovary after anthesis and can directly develop into seedless fruits without exogenous auxin or pollen stimulation. Although this characteristic of natural seedless fruit is controlled by genes, it is also affected by environment, especially temperature.

For example, frost injury can cause the formation of seedless pear; low temperature and high light can induce seedless tomato; short day light and lower night temperature can cause melon to produce seedless fruit, which may be because low temperature and frost injury inhibit the normal fertilization and development of ovule. Because seedless fruits do not form seeds, seedless grapes can only be propagated by cutting, grafting and other nutritious propagation. In addition to grapes, there are many fruits that are seedless in this way, such as bananas, mandarins, pineapples and so on.

Attached: how to choose seedless grapes

1. Fresh grapes have a layer of white frost on the surface, which will fall off as soon as you touch it with your hands. Grapes without white frost may be picked and picked, and the white frost will fall off.

2. Fresh grape stalks are strong and firm between stalks and grains, while those with long stock are shaky when picking up pedicels. It is recommended not to buy them.