Methods of Breeding New Strains of Sweet Buckwheat and Isostyle Pure Lines Based on Isostyle Fertility Characteristics

Abstract

A method for breeding a new common buckwheat line and a homostyle pure line on the basis of an homostyle fertility characteristic comprises a method for breeding the new common buckwheat line on the basis of the homostyle fertility characteristic and a method for breeding the homostyle pure line on the basis of the homostyle fertility characteristic. A breeding test region should be isolated fromother common buckwheat planting regions at the isolation distance of 1,500-2,500 m. Bred test male and female parents should planted in single rows, and male parents and female parents are planted alternatively in equal rows of 1:1. Cultivated species are used as parents, the descendant variation rate is increased, and excellent variant descendant materials can be screened. After sowing of F1-generation seeds, forward heredity screening is adopted, special-shaped flower materials in homostyle descendants and homostyle materials in special-shaped flowers are reserved, complete heritable variation of descendant materials is guaranteed, and the descendant selection workload is reduced. Parents are used as male and female parents for each other, and reciprocal cross is performed at the same time. New pure lines can be bred from F1 generations, breeding of the new line can be realized through isolation and stable breeding for 2-3 years after the F2 generation, and the resource innovation and line breeding age limit is shortened.

Description

technical field [0001] The invention belongs to the technical field of crop breeding, and in particular relates to a method for breeding sweet buckwheat by utilizing isostyle fertility. Background technique [0002] Sweet buckwheat is one of the two cultivars currently grown in my country. It is a cross-pollinated crop, and the yield of sweet buckwheat is generally lower than that of self-pollinated tartary buckwheat. The reason is mainly due to the self-incompatibility of sweet buckwheat under natural hybridization, and the low seed setting rate (the sweet buckwheat has a unique flower structure, and the sweet buckwheat flower organs are mainly divided into long styles and short stamens ( figure 1 ) and short style long stamens ( figure 2 ) two types, and two kinds of flowers can only be cross-pollinated), unstable, and artificial sexual hybridization is difficult to carry out in an orderly manner. The reason for the failure of artificial hybridization is mainly due to t...

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Problems solved by technology

However, in the above method, only one flower type is retained in the selection of inbred lines, which reduces the variation rate of offspring, which is not conducive to the discovery of favorable genes and the selection of excellent offspring.

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