Limitations of traditional breeding techniques do not include

The limitations of traditional breeding technology do not include the following:

1. The limitations of traditional breeding technology generally do not include the lack of breakthrough genes.

2. Traditional breeding technology generally refers to the method of using the natural breeding process and older breeding methods to cultivate new biological varieties.

3. Traditional breeding uses different technical means, and usually attaches great importance to the research and utilization of hybrid vigor, to continuously gather various excellent genes that are beneficial to improving grain quality and yield into a certain variety, and then let It obtains relatively high yields and improves its ability to withstand disasters such as drought.

4. However, the resistance obtained through traditional breeding is usually easily affected by the variety and regional environment. For example, if a new stress-resistant variety bred in the north is planted in the south, it may not The resistance to adversity will not be too obvious.

Traditional breeding techniques include: hybrid breeding, polyploid breeding (haploid breeding), mutation breeding (physical), ultraviolet mutagenesis, chemical mutagenesis, and now ion beam breeding. Cross-breeding can accumulate different minor-effect genes that control the same trait in both parents, or combine excellent traits that control different traits in both parents. Hybridization does not produce new genes, but it changes the genetic makeup of organisms.

Mutation breeding refers to using chemical and physical factors to induce variation in the genetic characteristics of animals and plants, and then selecting single plants/individuals that meet certain people's requirements from the mutant population, and then cultivating new germplasm. or breed breeding methods. It is a modern breeding technology developed after cross breeding and selective breeding.