Drought-resistant sweet potato variety rapid breeding method

Abstract

The invention relates to a drought-resistant sweet potato variety rapid breeding method, and relates to the technical field of hybridization breeding. The breeding method comprises the following steps: F1 generation hybrid true seeds are obtained through directional crossing or polycrossing; drought resistance screening and identification are carried out; and rapid propagation and breeding are carried out. According to the invention, the F1 generation true seeds are obtained through the method of directional crossing or polycrossing, such that the probability of a salinity-tolerant variety in the offspring is greatly increased. The salinity-tolerant sweet potato line identification is put to a first round (a technical prejudice is overcome because first-round selection is carried out according to yield and quality level), such that the inclusion of a salinity-tolerant single plant in the hybrid offspring is ensured to a maximal extent, and materials without salinity tolerance is rejected. Therefore, the selected single plants are greatly reduced, and field identification work load is substantially reduced. A remote multi-site yield comparison test can be completed in one time, and breeding time is shortened by 2-3 years. The method also has the advantages of high accuracy, low blindness, and high efficiency.

Description

technical field [0001] The invention relates to a rapid breeding method for drought-resistant sweet potato varieties, which belongs to the technical field of hybrid breeding. Background technique [0002] Drought is a major environmental problem worldwide. In the potato area in northern my country, the rainfall is mostly concentrated in mid-July and August, and the early and late stages of sweet potato growth often encounter drought, which limits the increase in sweet potato production. In the early stage of sweet potato growth, sweet potato seedlings are very sensitive to soil moisture conditions. After suffering from drought stress, sweet potato seedlings are prone to die, resulting in lack of seedlings and broken ridges, which seriously affects the yield of sweet potato. Therefore, cultivating drought-tolerant sweet potato varieties is one of the important ways to increase the yield of sweet potato, and plays an important role in the development of sweet potato industry ...

AI Technical Summary

Problems solved by technology

There are some deficiencies in the traditional sweet potato hybrid breeding method: firstly, more attention is paid to the yield level and quality traits of the father and mother when matching the hybrid combination, and less attention is paid to the drought tolerance of the parents; secondly, the first round of screening is carried out according to the yield level. Filtered F 1 The number of single-plant populations of the first-generation hybrids is large, and more manpower and material resources are required for field identification; generally speaking, it takes 2-3 years to complete subsequent field and laboratory analysis and identification of yield, quality, and disease resistance.

Therefore, the traditional breeding program has a large workload, long breeding cycle, and high cost; and the drought resistance identification and screening were not carried out in the early generations of breeding, resulting in a large number of drought-tolerant sweet potato plants that may have been eliminated in the first round of selection