Polyploid watermelon is more nutritious ~ ~ and ordinary diploid watermelon is not as good as polyploid watermelon ~ seedless watermelon triploid seedless watermelon is cultivated according to the principle of chromosome variation. But the development of seedless watermelon still needs auxin, so where does auxin come from if there is no seed? Generally speaking, the synthesis sites of auxin are Ye Yuan bases, young leaves and developing seeds. Among these sites, there are enzyme systems related to auxin synthesis. Tryptophan in plants undergoes amino conversion, decarboxylation and twice oxidation under the catalysis of many enzymes, and finally becomes auxin (indoleacetic acid). The pollen of diploid watermelon not only contains a small amount of auxin, but also contains enzymes that convert tryptophan into auxin. When the diploid pollen germinates, the pollen tube formed extends into the ovary of the triploid plant, and its own enzyme system for synthesizing auxin is transferred into it, so that a large amount of auxin can still be synthesized in the ovary and the ovary can develop into seedless fruit. ~ ~ Ordinary watermelon is diploid, that is, it has two sets of chromosomes (2n = 22). When the seedlings were treated with colchicine, the cell chromosomes of diploid watermelon plants became tetraploid (4n = 44). This tetraploid watermelon can blossom and bear fruit normally, and the seeds can germinate and grow normally. Then, the tetraploid watermelon plant is used as the female parent (emasculating when flowering) and the diploid watermelon plant is used as the male parent (taking its pollen and giving it to the tetraploid pistil), so that a triploid plant can be produced on the tetraploid watermelon plant, and the normal diploid watermelon pollen should be used to pollinate the pistil when flowering to stimulate the ovary to develop and bear fruit. Because the ovule can't develop into a seed, but the fruit develops normally, this watermelon has no seeds! Several kinds of seedless fruits, such as seedless tomatoes, seedless watermelons and bananas, are introduced in biology textbooks for senior high schools. As we know, fruit is developed from ovary, and a certain amount of auxin is needed in the process of ovary development and fruiting. Generally speaking, auxin needed for fruit development is provided by young seeds formed by ovule development, and triploid seedless watermelon is cultivated according to the principle of chromosome variation. But the development of seedless watermelon still needs auxin, so where does auxin come from if there is no seed? Generally speaking, the synthesis sites of auxin are Ye Yuan bases, young leaves and developing seeds. Among these sites, there are enzyme systems related to auxin synthesis. Tryptophan in plants undergoes amino conversion, decarboxylation and twice oxidation under the catalysis of many enzymes, and finally becomes auxin (indoleacetic acid). The pollen of diploid watermelon not only contains a small amount of auxin, but also contains enzymes that convert tryptophan into auxin. When the diploid pollen germinates, the pollen tube formed extends into the ovary of the triploid plant, and its own enzyme system for synthesizing auxin is transferred into it, so that a large amount of auxin can still be synthesized in the ovary and the ovary can develop into seedless fruit. Seedless watermelon is planted with seeds, but this seed is not the seed in seedless watermelon, but the seed in triploid watermelon formed by crossing natural diploid watermelon with tetraploid produced by mutation. Because it is triploid, it has no reproductive ability, so it has no seeds. Watermelon is rich in nutrition, including sugar, sucrose, glucose, propionic acid, alanine, citrulline, glutamic acid, arginine, malic acid, citrulline and so on. Each hundred grams of watermelon juice contains protein1.2g, carbohydrate 4g, crude fiber 0g, calcium 6mg, phosphorus10mg, iron 0mg, carotene 0.17mg, vitamin b 1.02, vitamin B2 0.02 and nicotinic acid 0. Watermelon is the best fruit for heatstroke prevention and cooling. The water content of watermelon is as high as 94%, and the content of natural nutritious juice ranks first among all fruits. Therefore, it is called "the king of summer melons and fruits". Eating watermelon in summer can prevent heatstroke, stimulate appetite, increase nutrition and help digestion. Watermelon is best eaten and cut now, and the refrigeration time is best not to exceed 3 hours, because watermelons that have been refrigerated for too long or deteriorated are easy to hurt the spleen and stomach and cause various intestinal diseases. Seedless watermelon, like seedless watermelon, is called "watermelon" because its fruit contains about 90% water. Watermelon in English means "watermelon". Watermelon contains many nutrients and chemicals. According to analysis, watermelon pulp contains protein, sugar, crude fiber, potassium, phosphorus, calcium, iron, sodium, magnesium chloride, nicotinic acid, vitamin A, vitamin B 1 and vitamin B2. Watermelon juice also contains amino acids such as citrulline, alanine and glutamic acid, organic acids such as malic acid, pectin and a small amount of glucoside, and alkaloids such as lysine and sweet theophylline. Watermelon juice is sweet, can relieve fever and quench thirst, and is a favorite summer product. Because watermelon contains a variety of nutrients and chemicals, with the continuous improvement of people's living standards, watermelon is no longer a seasonal consumer product, but gradually becomes a nutritious food. According to the analysis, 500g watermelon pulp contains protein and sugar, which is equivalent to the heat generated by 56g wheat (about 83.7kJ), and can provide energy for normal physiological activities of human body. Studies have shown that watermelon can also regulate physical strength and improve endurance. Watermelon pulp contains vitamins, various sugars, minerals and organic acids, and is an indispensable component of human bones and blood. Watermelon with sweet juice is a fruit that people must eat every day in midsummer. However, not everyone can eat watermelon, even those who can eat it should pay attention to the scientific eating method. Some patients, or in some cases, it is best not to eat. First, the sugar content of diabetic watermelon is about 5%, mainly glucose, sucrose and some fructose, which means that eating watermelon will increase blood sugar. Normal people can keep their blood sugar and urine sugar at a normal level because they can secrete insulin in time. People with diabetes are different. Eating too much watermelon in a short time will not only increase blood sugar, but also lead to acidosis and even life-threatening due to metabolic disorder. The daily intake of carbohydrates (carbohydrates) by diabetics needs to be strictly controlled. Therefore, if you eat watermelon many times a day, you should reduce the amount of meals and flour products (carbohydrates) accordingly, so as not to aggravate your illness. Second, patients with renal insufficiency Patients with renal insufficiency have greatly reduced the function of expelling water from the body, so edema of the lower limbs or the whole body often occurs. If this kind of patients eat too much watermelon, they will consume too much water and can't excrete excess water in time, which will lead to excessive water storage in the body and increased blood volume, which will not only aggravate edema, but also easily induce acute heart failure. Therefore, patients with renal insufficiency should eat less or not eat watermelon. Third, the early stage of a cold, Chinese medicine believes that whether it is a cold or a wind-heat cold, its initial stage belongs to the exterior syndrome, and divergent treatment should be adopted to treat it from the exterior. It is believed that the attack will aggravate the condition before the surface is solved. Watermelon has the function of clearing away heat. Eating watermelon at this time will aggravate the cold or prolong the course of disease. Fourth, oral ulcers in patients with oral ulcers are considered by Chinese medicine to be caused by yin deficiency and internal heat and virtual fire disturbance. Because watermelon has diuretic effect. If people with oral ulcers eat more watermelons, the water needed for the recovery of oral ulcers will be discharged too much, which will aggravate the internal heat due to yin deficiency, lengthen the course of disease and make it difficult to heal. Fifth, the maternal body is weak. Chinese medicine believes that eating too much watermelon will be too cold and damage the spleen and stomach. 6. It is not advisable to eat watermelon before and after meals, because a large amount of water in watermelon will dilute the digestive juice in the stomach and affect the digestion and absorption of food, and eating watermelon in large quantities before meals will occupy the volume of the stomach and greatly reduce the intake of various nutrients, especially for children, pregnant women and lactating mothers. For people who want to lose weight by dieting, eating watermelon before meals is a good way to reduce their food intake. Seven, watermelon should not be eaten because watermelon is a "cold food." Anyone who eats too much will hurt the spleen and stomach, leading to poor appetite, indigestion, decreased gastrointestinal resistance and abdominal distension and diarrhea. Eight, eat less ice watermelon Although eating ice watermelon on a hot day has a good effect of relieving summer heat, it is very irritating to the stomach and is easy to cause damage to the spleen and stomach, so we should pay attention to grasping the delicious temperature and quantity. Watermelon is best placed on the lowest floor of the refrigerator. The temperature here is about 8- 10℃, and the temperature is also the best. Don't eat more than 500 grams at a time. Eat slowly. For people with dental caries (tooth decay) and tooth allergies, they will feel sour and painful after catching a cold, and people with poor gastrointestinal function are not suitable for eating iced watermelons.