From the parents' point of view,

There are two chromosomes in the somatic cell which is developed by normal diploid watermelon without any treatment.

After the female parent germinates, there are four chromosome groups in the somatic cells that grow and develop after chromosome doubling.

After the development of the parents is completed, artificial pollination is carried out, so that the hybridized female parent can bear watermelon and take its seeds for later use.

The above is the treatment of the first year

In the second year, the obtained seeds are sown, and after they bloom, they are stimulated with pollen of diploid watermelon to produce auxin and other corresponding plant hormones, so as to promote the triploid watermelon to change from flowers to fruits.

Bai Zi contained in seedless watermelon is the seed or gamete with incomplete development after synapsis disorder.

Generally, chromosome doubling can be treated with colchicine, low temperature treatment and laser treatment at fertilized egg stage.

that's it. got it?

hope to adopt o (∩ _ ∩) o.