Symptoms During the use of high quality wheat varieties, there is often a phenomenon of mixed degradation. The purity of the seed after the degeneracy was significantly reduced, the character deteriorated, the quality deteriorated, the stress resistance decreased, and the yield significantly decreased.
The causes of the mixed degradation of the etiological species are as follows: First, mechanical intermixing may occur in the process of sowing, collecting, threshing, drying seeds, transportation and storage of wheat, which may be artificially mixed, that is, mechanical intermixing. This is an important reason why wheat varieties are mixed together. one. Second, biological hybridization occurs in natural hybrids between different varieties in the field, leading to the separation of offspring, and the emergence of undesirable individuals, destroying the consistency of the species, called biological hybrids. When the machinery is mixed, it will increase the biological mix and speed up the degradation of the species. Third, when the new mutant wheat varieties are promoted, due to the effects of various natural factors, wolfberry induces certain mutations in the wheat, resulting in mutation personality. The traits that break through individuals in production are mostly poor. Fourth, the wheat varieties themselves continue to separate Some hybrid wheat cultivars new varieties of wheat traits are not stable, the genotype of the degree of homozygosity is not high, these new varieties will continue to separate during the cultivation process, resulting in variant individuals, resulting in varieties of hybrid degradation. Fifth, the quality of selected seeds is not high. During the production process, the species is not selected according to the typical traits of the species. The greater the deviation, the greater the degree of deviation. In addition, when the seedlings are kept in the seeding field, the good hybrid seedlings will be left as strong seedlings, which will also result in mixed degradation of varieties.
Prevention and control methods (1) Prevention of mechanical miscellaneous harvesting of wheat seeds requires single harvesting, single transport, singles, single and separate storage. During the storage of seeds, pests and rodents must be protected against misalignment and also stop mildew. The tools should be cleaned when the seeds are aired or processed and broadcast. (2) Preventing Biology from Mixing During the wheat breeding process, we must take necessary isolation measures to prevent biological contamination. If necessary spatial isolation, that is, planting different varieties of wheat to be separated by a certain distance; time isolation by sowing at the time of sowing, so that the flowering period of different wheat varieties staggered; barrier isolation method can also be adopted through high crops, trees and other barriers, The pollen of different species cannot be transmitted to the wheat production field. (3) When selecting a species, strictly eliminate impurities. Special attention should be paid to removing plants or wheat and wheat grains that do not meet the typical traits of the variety, ie, removing impurities. Deteriorating means removing grains and plants that have been contaminated with pests and diseases and poor growth. This work is a long-term and necessary task. It must be carried out year after year to prevent the degeneration of wheat.
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