What are the reasons for the low germination rate of seedless watermelon?

Reasons for the low germination rate of seedless watermelon. First, the embryo is underdeveloped, accounting for only one-half of the total seed weight, and the proportion of deformed embryos is relatively high. Second, the seed coat of triploid watermelon seeds is thick, making it difficult for the young embryo to break through the seed coat and sprout. Third, the seed cavity of seedless watermelon seeds has large gaps. Fourth, seedless watermelon requires a relatively high temperature during sprouting, which is not easy to regulate accurately, making it difficult to increase the germination rate of seedless watermelon in production.