Source of life and duration of use of crop seeds: Seed Technology Category: Technical Articles Update Time: 2008-10-29 16:23:09 Read 77 times

Li Shengxiang (Hangzhou Xiaoshan Seed Management Station)

As with all living organisms, seeds continue to carry out life activities within the cells. When the seed is fully matured, it is separated from the mother plant and becomes an independent individual. It temporarily enters dormancy and seems to stop growing on the surface. In fact, the physiology of the embryo is still going on, but it is very weak. Seeds are inseparable during storage and external environmental conditions. They are not affected by changes in external environmental conditions from time to time, and the worse the storage conditions, the greater the impact will be, and will eventually lose their viability. The so-called seed life is generally defined as the maximum period for which the seed can maintain its viability under certain storage conditions after the seed matures off the parent plant. In agricultural production, various effective measures must be taken to maximize the life of crop seeds in order to meet the requirements of agricultural production. The seed of the crop as a sowing material must have an exuberant vitality. Not only it is required to germinate normally but also neatly made. Therefore, the useful life of seeds in agricultural production is closely related to the length of their lives. That is, the longer the seed life, the longer the useful life of agricultural production, but there is no consistent agreement between the two. trend. Under the climatic conditions of our region, the life of cereals of cereal crops generally can only reach 1 to 3 years. The seeds used in production are more than those in the current year, and the seeds in the next year can also be used under normal circumstances. In short, the useful life of seeds will not be too long. For example, the life expectancy of milk vetch and cotton is far more than that of rice and wheat. Now that there is a refrigerator in the house, a small amount of vegetables can be put into the refrigerator after some harvesting, so that the viability can be maintained for more than 3 years. However, there are few seeds used for more than three years in production. This is mainly due to the fact that the storage time of crop seeds exceeds a certain limit, and a series of physiological changes occur in the embryonic cells. Although the viability has not been completely lost, the original physiological activity has begun to decline. After sowing, even if they can germinate long seedlings, they are often thin and short and have deformities and abnormal growth and development, which affects product quality and yield. Therefore, the useful life of crop seeds cannot be judged simply by whether or not they germinate. Careful observation and comparison should be made from long-term production practices, and a reliable range of different crops and varieties should be determined under local climate conditions for production. in accordance with. At present, the standard adopted for the age of agricultural seeds is still based on the germination rate of seeds. Since the seed maintains vigorous vigor after storage for a certain period of time, it can be largely reflected by the germination rate. It is generally believed that although the seed germination rate gradually decreases with storage time, if it does not decrease below 50% It means that more than half of the seeds in the entire seed population still maintain their viability, and they can still be used as seed material when the new seeds are not sufficiently supplied. In the high temperature regions of southern China, the lifespan of crop seeds is relatively short, and the useful years and lifespan are very close. However, the lifespan of crop seeds in the dry and cold regions in the north is greatly extended, and there is a big gap between the useful life and the life span.

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