Vegetable Seeds are used in the production of vegetable seeds, divided into conventional and hybrid seeds.Vegetables that conventional types of vegetables to grow itself through natural laws of seeds, vegetables hybrid seeds (general hybrid F1 generation of hybrid) is by using different features of plants (male and female parent) for their pollination, change its characteristics.
First, many varieties and complex.In science and technology is the first productive force and science and technology oriented market sense, such as policy, scientific research institutions, experts and scholars engaged in the work of agricultural breeding have mushroomed, new achievements and new varieties are created.The resulting problems, a species and strains are many, character difference is small, removing impurity harder when breeding, varieties of authenticity and purity is difficult to guarantee;Second, in many scientific research units and experts and scholars of breeding race, south guo is inevitable the sham as the genuine, some traits instability, poor adaptability, or no market with a production value of species, strain, misleading, interfere with the normal order of seed production and operation.So for buying vegetable seeds, should be on the basis of reputation good place.Buy formal cultivated seeds.
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Radish hybrid seed production method
The heterosis of radish is extremely obvious, and a generation of hybrids are used more in production. The ways of radish hybrid seed production are self-incompatible and male sterile lines. Self-incompatibility lines need to be propagated through pollination to propagate their parents. Since there are few seeds per pod, usually only 3 to 10 seeds, the propagation coefficient is low, and the cost of seed production is high. Therefore, radish mainly uses male sterility to prepare a hybrid line. . Parents' preservation and reproduction. Male sterility of radish belongs to the karyoplasm interaction type. When using this male sterile line for seed production, it must have sterile line (mother of the hybrid generation), maintainer (male of reproductive sterile line) and father. This department (the male parent of the hybrid generation) is supported by three families. Each of the above three lines must adopt the method of breeding the original species with the method of keeping the seed, and the cultivation and management level should be high. When harvesting the fleshy root, it must be strictly selected to ensure the typicality of the original species. The breeding of the three lines is best to set up a separate propagation nursery, that is, a breeding nursery line (planting sterile line and maintainer line in the nursery, planting line ratio is 3 to 5:1), and a second nursery to maintain breeding. Department and the father of the system, strictly prevent biological mixing, isolation distances need to be more than 2500 meters. Generation of hybrids. The production of a hybrid seed can be carried out in the field or in the ground. The isolation distance should be more than 1,000 meters. In the seed production area, the sterile and paternal lines should be planted in a 4 to 5 to 1 line ratio. In combination with seedling colonization to remove hybrids, special attention should be paid to the removal of individual fertile strains that appear in the sterile line at the beginning of flowering. Usually every 1 to 2 days, once after flowering, the parents are allowed to pollinate naturally, or artificially released bees assist in pollination. When about 75% of the effective inflorescences are pollinated, the bees can be withdrawn and the father can be withdrawn to prevent the parents from crossing the inflorescence. It is prone to miscellaneous when harvested. If the father's and female's parents have a large difference in flowering time (more than 10 days), they can transplant the late-flowering system and post-plant early flowering system to adjust the flowering period. Sometimes due to changes in environmental conditions, parents may have a slight difference in the flowering period. If necessary, the parent who has twitched prematurely may be given a heavy picking, that is, removing the main flower of the plant, promoting the sprouting of the lower branch, and delaying flowering. Heavy harvesting does not generally affect seed production.