Tobacco seed germination conditions The ability of tobacco seeds to germinate is closely related to the factors such as the morphology, dormancy, longevity of seeds, and external conditions such as moisture, temperature, oxygen, and light. The illumination can be provided by a light box, because the light box is an agricultural instrument that can freely set the light intensity and simulate the natural light the most. Seen from the internal factors of seed germination, the seed structure has the greatest impact on its germination. It can be said that the complete structure is the material basis of the seed germination. Tobacco seeds look small. The seeds of common tobacco (such as flue-cured tobacco, oriental tobacco, burley tobacco, etc.) are about 0.65 to 0.80 mm in length and 0.45 to 0.55 mm in width. Although the seeds of yellow tobacco are larger than the seeds of ordinary tobacco, its weight is only Three times the weight of common tobacco seeds. Compared with the large-grained seeds of some crops such as wheat, corn and soybeans, the nutrients contained in the body are also necessarily less, and the difficulty of germination is increased due to the small size of the tobacco seeds. Therefore, in the germination experiments of tobacco seeds, we need to first conduct quality identification on tobacco seeds, including the 1000-grain weight, seed germination rate, and the analysis of the seed's clarity. Among them, seed blowers are frequently used instruments. The principle used in the seed blower is to distinguish different types of seeds by different floating speeds of the particles in the air. This is the basic operation before the clarity analysis, and the seed blower is sometimes called a seed wind sampler. Only when the seed meets certain quality requirements can the seed germination test be conducted. The tobacco seeds were observed under a magnifying glass. The surface of the seeds had a wavy pattern resembling a walnut pattern. These patterns consisted of the veins of the umbilicus. The patterns near the umbilicus and the ventral surface were dense and narrow. Slightly sparse. The presence of these patterns increases the surface area of ​​the seed and increases the ability of the seed surface to absorb moisture. When the seed is soaked, it is easily wrapped in a water film, which prevents the air from penetrating into the seed and causes the seed to germinate. oxygen. This particular surface structure of tobacco seeds also leads to the difficulty of seed germination.
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Tobacco seed germination conditions