Is seedless grapes a contraceptive?
The recent popularity of seedless grapes allows many lazy people to taste the sweetness and taste sweet grapes without spiting seeds. However, recent rumors have caused many people who love to eat grapes to panic and fear that they have eaten seedless grapes. Bad for health. In fact, seedless grapes are not seedless by the use of contraceptives. We all know that grapes belong to the fruit of angiosperms, so they will have seeds, but later, for the sake of people to eat, they will pass special The way to cultivate grapes to achieve seedless, just in the grape growing process, hit some plant hormones to achieve results, and will not affect the safety of the fruit.
The birth of seedless fruit
1. Apply a certain concentration of phytohormones to the fruit to inhibit seed development and promote fruit development;
2, through the means of hybridization, the seed can not be normal development, while giving some stimulation, so that the fruit itself can produce enough of its development of plant hormones;
3. Produce seedless fruits by looking for mutated individuals whose seeds themselves are infertile but can produce their own plant hormones.
Seedless grapes are typical examples of the first and third types of seedless fruit. For example, the largest grape in China, Kyoho, produces its own seeds. However, if a certain concentration of gibberellin is used during the flowering period of the grape and the young ear formation period, the seed development can be inhibited and the fruit enlargement can be promoted, thereby obtaining a seedless Kyoho grape. The gibberellin-treated grape not only achieves a high seedless rate but also has the effect of increasing the size of the fruit. In addition, some grape varieties, such as “Jingkejing†and “Large red seedlessâ€, due to their own variation, after the pollination, the fertilized embryo sac will soon stop developing, but the fruit itself can produce hormones, which makes the fruit enlargement and development. It is seedless fruit.
How to pick a seedless red
First, look at hoarfrost. There is a layer of white frost on the surface of the fresh grapes, which will fall when the hand touches it. The grapes without white frost may be picked up.
Second, look at the connection. The fresh grape fruit stem is tough and the connection between fruit stems and fruit pieces is firm. Grapes with long stocking time, on the other hand, are teetering on fruit stems.
Third, look closely. Generally, the more closely the grapes grow, the higher the nutrient content, and the less nutritious they will appear to be. However, red grape is much looser than other grapes, so when comparing the tightness of fruit, pay attention to compare the same variety.
Fourth, weight. Two bunches of the same variety of grapes, the heavier the more delicious.
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