At the same time, carbon dioxide is discharged through the seed coat, and the physical state inside changes; Secondly, air and seeds carry out a series of complex life activities during germination. Only when seeds keep breathing and gain energy can normal life activities be guaranteed.
Finally, a series of physiological activities, such as low temperature, inhibition of respiration and decomposition of nutrients in seeds, need to be carried out at a suitable temperature.
Extended data:
The water content of dormant seeds generally only accounts for about 10% of dry weight. Seeds must absorb enough water to start a series of enzyme activities and start germination. Different seeds have different water absorption when they germinate.
Seeds containing more protein, such as leguminous soybeans and peanuts, absorb more water; However, wheat, rice and other cereal seeds mainly contain starch and absorb less water.
Generally speaking, seeds have a critical value of water absorption, below which they cannot germinate. Generally, seeds can germinate only by absorbing 25% ~ 50% or more of their own weight.
For example, rice 40%, wheat 50%, cotton 52%, soybean 120% and pea 186%. The difference of water absorption during seed germination is caused by the difference of components contained in seeds.
In order to meet the water demand of seed germination, timely sowing and intensive cultivation should be carried out in agricultural production to create good water absorption conditions for seed germination.
Baidu Encyclopedia-Seed Germination