Radish Hybrid Seed Production Technology

The heterosis of radish is extremely obvious, and a generation of hybrids are used more in production. The radish hybrid seed production method utilizes self-incompatible and male-sterile lines. The self-incompatibility line needs to pollinate the parents through budding. Since there are few seeds per leg, usually only 3-10 seeds, the propagation coefficient is low, and the seed production cost is high. Therefore, the radish mainly uses the male sterile line to prepare a hybrid line. . 1. 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—5:1), and separate breeding nursery Department and the father of the system, strictly prevent biological mixing, isolation distances need to be more than 2500 meters. 2. 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 line and the paternal line should be planted in a 4–5:1 ratio, in the early growth stage. In combination with seedling colonization to remove the miscellaneous strains, special attention should be paid to the removal of the individual fertile strains that appear in the sterile line at the beginning of flowering. Generally every 1-2 days are checked 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 When about 75% of the effective inflorescences are pollinated, the bees can be withdrawn and the father can be withdrawn to prevent the parents from crossing the inflorescence.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, the parents have a slight difference in the flowering period. If necessary, the parent who has taken a bite to the moss can be re-applied, that is, remove the main flower, promote the germination of the lower branch, and delay flowering. Heavy harvesting does not generally affect seed production.

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