A rapid breeding method for sweet potato varieties resistant to black spot

Abstract

The present invention relates to a breeding method for a black spot resistant sweet potato variety, and belongs to the technical field of hybridization breeding. The method of the present invention comprises steps of: acquiring F1 hybrid true potato seeds, screening single plants of the black spot resistant sweet potatoes, and performing fast breeding. The assessment and selection of the black spot resistant material is performed at the first round so as to eliminate disease-resistless materials; and it is maximally ensured that the black spot resistant single plants in the hybrid cultivars are selected. Given that ''the number of the selected black spot resistant single plants'' is much smaller than ''the number of the single plants that are selected according to the yield level''; so that the number of the single plants that need to be assessed in the field decreases dramatically and the workload is significantly reduced; an experiment of comparison between yields of geographically different locations can be performed at a time and the breeding period can be foreshortened by 2 to 3 years. The breeding method provided by the invention has the characteristics of simple breeding process, short breeding cycle, high accuracy, less blindness and high efficiency. The novel black spot resistant sweet potato variety with good comprehensive properties is bred, and has good economic, social and ecological benefits.

Description

technical field [0001] The invention relates to a rapid breeding method for black spot-resistant sweet potato varieties, which belongs to the technical field of hybrid breeding. Background technique [0002] Sweet potato black spot is the most common disease in sweet potato production in my country. It is widely distributed and occurs heavily in North China, Huanghuaihai Basin, Yangtze River Basin, and southern summer and autumn potatoes. The main cause of block rot and death of potato seedlings. Diseased potatoes contain toxins and cannot be eaten. If livestock eat more by mistake, it can cause poisoning, and severe cases can be fatal. In recent years, the planting area of ​​fresh and high-quality processed sweet potatoes in my country has expanded rapidly, but there is a shortage of sweet potato varieties resistant to black spot disease in production, and black spot disease occurs seriously during storage. The annual loss caused by it accounts for about 10%, and it can re...

AI Technical Summary

Problems solved by technology

There are certain deficiencies in the traditional hybrid breeding method of sweet potato resistant to black spot disease: firstly, when matching hybrid combinations, more attention is paid to the yield level and quality traits of the father and mother, and less attention is paid to the black spot resistance of the parents; secondly, screening is based on the yield level The number of F1 generation hybrid single plant populations is relatively 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 of yield, quality, and disease resistance. Identification; therefore, the traditional breeding program has a large workload, long breeding period and high cost

In addition, the identification of black spot resistance traits was late, resulting in a large number of sweet potato plants resistant to black spot disease may have been eliminated in the first round of screening