A kind of breeding method of sweet potato variety resistant to root rot

Abstract

The invention relates to a method for breeding a root rot resistant sweet potato variety and belongs to the technical field of cross breeding. The method comprises the steps of obtaining F1 generation cross bred true seeds, screening root rot resistant sweet potato single plants, rapid multiplication and breeding. The step of selecting the root rot resistant materials is conducted in the first round, the materials which are not resistant to the root rot are eliminated, and it is guaranteed that the root rot resistant single plants in filial generation are selected to the greatest extent; therefore, the number of single plants needing to be subjected to field identification is reduced substantially, and the workload is reduced remarkably; different-place multiple-spot yield comparison trials can be completed in one time, and the breeding period is shortened by 2-3 years. The breeding method has the advantages of being simple, short in breeding period, high in accuracy, low in blindness and high in efficiency; the new sweet potato variety which is resistant to the root rot and good in comprehensive characters is bred out, and a good economic benefit, a good social benefit and a good ecological benefit are achieved.

Description

technical field [0001] The invention relates to a method for breeding sweet potato varieties resistant to root rot, and belongs to the technical field of hybrid breeding. Background technique [0002] Sweet potato root rot is a devastating disease on sweet potatoes in my country. It mainly occurs in Shandong, Hebei, Henan, Jiangsu, Anhui, Hunan, Hubei and other provinces. Among them, Shandong, Hebei, and Henan are common and cause serious damage. Prevention and control, planting disease-resistant varieties is the most effective measure to prevent and control the disease in production. Therefore, cultivating sweet potato varieties resistant to root rot plays an important role in promoting the healthy development of the sweet potato industry in root rot disease areas and increasing farmers' income. [0003] The traditional root rot-resistant sweet potato hybrid breeding procedure is: Sow the F1 generation hybrid seeds, transplant them to a field environment that is clean and d...

AI Technical Summary

Problems solved by technology

There are certain deficiencies in the traditional hybrid breeding method: First, when matching hybrid combinations, more attention is paid to the yield level and quality traits of the parents, and less attention is paid to the root rot resistance of the parents.

Secondly, the growth environment of the F1 generation hybrid seed is an ideal growth environment, which does not match the actual growth environment; therefore, some of the sweet potato single plants screened out in this step must fail to pass the field identification of root rot resistance in the later stage; if It is actually a big waste to carry out field identification of these sweet potato plants in different years and different locations for the yield and quality of potato tubers; and some individual plants resistant to root rot may have been screened in this step. Elimination affects subsequent screening

Thirdly, under suitable growth conditions for F1 generation hybrid seeds, the growth potential of sweet potato can be fully exerted, and the yield of sweet potato is generally high; Field identification and screening of traits such as yield, quality, and disease resistance; and field identification requires more manpower and material resources; generally speaking, it takes 2-3 years to complete field identification

Therefore, the traditional breeding program has a large workload, long breeding period, and high cost; in addition, the identification of root rot resistance traits is late, resulting in a large number of root rot-resistant sweet potato plants that may have been eliminated in the first round of selection