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The ultra-dry storage technology reduces the water content of plant seeds to the safe water content (7% to 5%) stored in the germplasm to achieve the similar effect of low-temperature seed storage. Studies have shown that through ultra-dry treatment, the storability of seeds such as sesame, flax, timothy, rape, peanut, onion, sage, gerbera, and a string of red is significantly improved.
The seeds of Platycodon grandiflorum were stored for 12 months (room temperature and 5e). After rehydration treatment, the germination rate was recorded every day in the germination test, and the seed germination curve was plotted. The germination time of P. platycodon which was stored at room temperature and the time of dehydration of P. platycoi was 4 y 8d. The peak of germination was observed on the 6th and 7th day. The germination time of super dry seed with water content of 3.0%-4.5% was mainly concentrated on 2}. On the 6th day, the peak period of germination was 3d. The seedling germination time of P. platycoi with 2.1% water content was 2'}8d and the peak time was 3d}4d. The control was not super-dried with P. grandiflorum seeds. The ultra-dry treatment resulted in higher seed germination uniformity than the control. . The temperature of seedlings stored at low temperature was distributed at 2}6d. The peak value of super-dry treatment was at the 3rd day, and it was close to the ultra-dry seeds stored at room temperature. However, the seeds that were not over-dried were pushed one day later and peaked at the 4th day. The period coincides with the peak period of 2.8% moisture content of Campanulaceae seeds.
Silica gel drying was used to dry the seeds of P. platycodon in the experiment, and the water content was reduced from 9.2% to 4.7%, 3.3%, 3.1%, 2.6%, 2.1%, respectively, and stored at room temperature and 5e (12 months). The water content of 4.7%, 3.3% ultra-dry treatment of Platycodon grandiflorum seed germination rate and low temperature storage of Campanulaceae seeds (water content of 9.2%) germination rate is close to and slightly higher, room temperature and low temperature is not much difference, when the Platycodon seed moisture content is lower than 3.1 At the time of %, the germination rate was lower than the low temperature storage activity of P. davidiana seeds that had not been ultra-dry treated. It can be seen that too low moisture content will reduce the vitality of the seeds. The reason may be that when the water content is excessively reduced, the cell structure of the seed is excessively dehydrated, the arrangement structure of the phospholipid is changed, the interface of the cell membrane is disrupted, and the extracellular material is infiltrated during the rehydration process, which affects the seed germination power.
After all, the storage of seeds in seed storage still needs to be considered in terms of energy. For the seeds of Platycodon grandiflorum, the germination rate can be increased under the appropriate water content through ultra-dry treatment. The moisture content of the seed is found at 4.7. Between 3.3% and 3.3%, storage at room and low temperature, the germination rate is ideal, but storage at room temperature, taking into account energy conservation and other issues, is a more ideal storage method for Platycodon grandiflorum seed.
Seed Storage Stores Energy-saving Ways for Seeding Campanulaceae Seeds
In China, as a common medicinal material and foodstuff, the demand for it is increasing day by day. It is mainly through artificial planting as the main source. However, after the seeds of Platycodon grandiflorum are mature, the seeds will gradually become senescent during storage. The vitality continues to decline. The newly harvested Campanulaceae seeds were stored at room temperature for up to 12 months at room temperature, and the germination rate was less than 10%, even lower, and could not be used for cultivation at all. Seed storage can solve similar storage problems and ensure seed quality.