I. Mechanical mixing caused by improper harvesting of seeds During the process of seed harvesting, threshing, cleaning, drying, storage, and transportation, careful implementation of technical regulations can easily lead to the mixing of pepper seeds. The following measures should be taken: 1 variety is harvested, and different varieties are piled separately to prevent mechanical mixing. 2 In the operations of threshing, cleaning, drying, storage, seed treatment and sowing, the sites and utensils should be cleaned in advance, and carefully checked to remove the remaining seeds. When drying seeds, different varieties should be kept at a relatively large distance in order to prevent wind blows or trampling of humans and livestock causing mixed species. Seeds with high water content should not be exposed to the sun and cement ground to prevent damage to the seeds and affect the germination rate. 3 When storing, dispensing, and seed processing, labels should be attached outside the container. Specify the variety, grade, quantity, purity. 4 The planting place must maintain a certain distance from other species. 5 Remaining in the field In the different growth stages of nursery and field growing season, field inspections are conducted to remove impurities, degrade disease, and go to disease at any time.
Second, the biological hybridization caused by natural hybridization as a common out of the pepper, due to isolation is not enough to occur in different varieties, varieties or types of natural hybridization (string flowers), resulting in non-gamma gametes participate in the fertilization process, resulting in Some heterozygous individuals, these hybrids will produce many types of recombination in the process of continuous reproduction, which will cause great changes in the genetic structure of the original breed population, resulting in mixed and degraded varieties. To prevent natural hybridization between varieties and varieties, the necessary isolation and seeding should be carried out: 1 Mechanical isolation: It is mainly used for the preservation of a small number of original species or original materials. The method is to adopt inflorescence suits, net shield isolation and greenhouse seed production during the flowering period. 2 Flowering Period Isolation: Staged sowing and staged planting are mainly adopted so that the different pepper varieties are staggered before and after the flowering period to avoid natural hybridization. 3 Space Segregation: This is the easiest measure. As long as the different varieties, varieties and types of pepper are separated from each other by 100 meters, they can be preserved. Third, the number of retained species is too few and continuous (close relatives) breeding degeneration in the breeding process, the number of retained species is too few and continuous forced bagging seed, will result in genomic genomic simplification of the genus group and the genetic basis is poor, The species's viability is reduced and its adaptability weakened. Therefore, the number of retained plants should not be too small, and they should not be forced to continue seeding.
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