In the process of germination of watermelon seed, sometimes the seed coat opens from the germinating hole (seed mouth), and even the entire seed coat opens. After the seed coat is opened, the water immersed can easily cause paddle seeding (the seed is swollen and fermented). Rotten seed, radicle can not be elongated, etc., is the seed that is not rotten for a moment, and can not successfully complete the death of the germination process. There are several reasons why this happens:
1. The seed soaking time is too short: the seed coat of the watermelon seed is composed of four different cell tissues, and the outer two layers are composed of a relatively thick cuticle and a cork layer, which are poor in water absorption and water permeability. If the seeds are soaked in water for a short time, the water cannot penetrate into the inner layer. When the outer layer expands after absorbing water, the inner layer still does not absorb water, so that the outer layer of seed coat will produce a kind of expansion force on the inner layer of seed coat. However, because the inner and outer seed coats are tightly connected together, and the outer seed coat is thick and the inner seed coat is thin, the inner seed coat is forced from the germination hole under the tension of the outer seed coat. "Weak link" cracked open.
2. When germination occurs, the humidity is too small: After the seeds of watermelon are soaked, the entire seed coat will swell and swell. When the germination is performed, the water evaporates faster due to the higher temperature. If the humidity is too low, the outer seed coat easily loses water and shrinks, but the inner seed coat is still in a wet and inflated state. As a result, there is a difference in the expansion force between the inner and outer seed coats, and because the inner and outer seed coats are closely linked, and the inner seed coats are thinner, the inner seed coats will shrink in the outer coat. Forced to crack open under force.
3. Germination temperature is too high: the germination temperature of watermelon seed should generally be maintained within 25-30 degrees. If germination, when the temperature exceeds 40 degrees for more than 2 hours, the seed coat opening phenomenon easily occurs. At this time, the seeds of the watermelon are dehydrated due to the high temperature and shrink, and the seeds are split and opened due to the same reason that the humidity at the germination is too small. Http://
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