Method for breeding inbred line by using sweet potato special materials

Abstract

The invention discloses a method for breeding inbred line by using sweet potato special materials. The method comprises a special material selection and isolation method, manpower-assisted inbreeding and inbreeding offspring testcross selection. In the invention, a sweet potato special resource which blooms and fructifies naturally and has wide compatibility is taken as a parent material, a plurality of systems with different genetic backgrounds are established at the same time, the inbreeding is performed strictly and the hybridization is avoided by taking isolation measures; the character of blooming and fructifying naturally and the target economical character are successively selected, so as to breed a inbred line material which has excellent target characters and can bloom and fructify naturally stably in the north area in China, the testcross of the inbred line materials is used for identifying the heterosis and the excellent inbred line is used for crossbreeding.

Description

technical field [0001] The invention relates to a method for breeding inbred lines by using special materials, in particular to a method for breeding inbred lines by using sweet potato special materials, belonging to the field of crop genetics and breeding. Background technique [0002] Sweet potato (I.batatas.6x) originated in the tropical regions of South America and is a short-day crop. It cannot naturally bud and flower in areas north of 23 degrees north latitude. Grafting and short-day treatments are required to promote flowering. In addition, sweet potato is a strict outcrossing crop, self-fertile, and closely related varieties form infertile groups. It is difficult for varieties in the infertile group to hybridize and bear fruit, and hybridization between infertile groups is feasible. This characteristic can maintain the hybrid vigor and vitality of the sweet potato species itself, but it brings various obstacles to the hybrid breeding work, severely restricts the res...

AI Technical Summary

Problems solved by technology

This characteristic can maintain the hybrid vigor and vitality of the sweet potato species itself, but it brings various obstacles to the hybrid breeding work, severely restricts the resource utilization and the free combination of parents in the sweet potato breeding, and cannot cultivate inbred lines like other hybrid crops. Accumulate beneficial genes and eliminate bad genes to improve hybrid vigor. Usually, highly heterozygous varieties or materials are used as parents to carry out sexual hybridization, which limits the improvement of sweet potato breeding. It is difficult to use inbred lines to configure hybrids to greatly increase yield like corn.

[0003] In order to use self-crossing to accumulate beneficial genes, breeders at home and abroad have done research on sweet potato self-crossing since the 1950s. Sakai and Hirosaki in Japan believed that sweet potato inbreeding can accumulate beneficial genes such as starch, thereby breeding high-starch varieties , Fuji Lai Kazuma and others discovered a small number of self-compatibility varieties in the 1960s, but there were no reports of success