Causes and Control Methods of Mixed Deterioration of Wheat Varieties

Hybrid degradation of wheat varieties is a kind of wheat that often appears after many times of planting of good wheat varieties. after hybrid degradation, the seed purity of wheat is lower, the quality becomes worse, the stress resistance decreases, and the yield decreases obviously. So what are the reasons for the hybrid degradation of wheat quality? How to prevent and cure it? Let's get to know it with the editor.

1. Causes of hybrid degradation of quality

1. Mechanical hybrid

In the process of wheat sowing, threshing, drying, transportation and storage, the hybrid appeared, which is one of the main reasons for the hybrid degradation of stored wheat quality at present.

2. Biological hybrid

Continuous natural hybridization between different varieties in the field will lead to bad individuals separated by offspring and destroy the purity of the varieties, which is called biological hybrid. When the mechanical mixing is serious, it will aggravate the biological mixing and accelerate the speed of variety degradation.

3. Variety mutation

In the process of popularizing new wheat varieties, some mutations will occur in wheat due to the influence of many natural factors, and the characters that break through individuals in production will mostly become worse.

4. The reason of wheat itself

The characters of the new wheat varieties bred by some miscellaneous families are unstable and the homozygosity is not high. These varieties will continue to separate in the planting process, resulting in variant individuals and hybrid degradation of the varieties.

5. The quality of seed selection is not high.

In the process of production, seeds are not selected according to the typical characters of this variety, resulting in poor seed quality, which will also lead to the phenomenon of variety degradation.

II. Prevention and control methods

The main results are as follows: 1. First of all, we should strictly guard against mechanical mixing. The seeds must be harvested, transported, hung and stored separately during harvest. The seeds should also be protected against insect, rat and mildew during storage, and the seeds should be dried and disinfected before sowing to ensure good seed quality.

2. In the process of breeding of improved wheat varieties, we should pay attention to take isolation measures and strictly prevent biological confusion. Generally, three isolation methods can be adopted. One is to carry out spatial isolation, that is, to plant different wheat varieties at a certain distance; the second is to use staggered sowing time to stagger the flowering period of different wheat varieties; the third is the barrier isolation method, through barriers such as tall stalk crops and forests, so that the pollen of different varieties can not be transmitted to the wheat seed field.

3. When selecting and retaining seeds, we must strictly remove the miscellaneous and inferior, especially pay attention to the removal of plants or wheat ears and grains that do not conform to the typical characters of this variety, and the ear grains contaminated by diseases and insect pests and plants with poor growth should be removed in time.

The above is the introduction of the causes and control methods of hybrid degradation of wheat varieties. I hope it can help you. If you want to know more about it, please follow us.