Rapid maize breeding and population improvement method

Abstract

The invention provides a rapid maize breeding and population improvement method, wherein the method includes the following steps: carrying out genotype identification of a basic population by using ahigh-density SNP molecular marker, combining with field phenotype identification, selecting an excellent individual population, and making the excellent individual population rapidly produce a large number of DH lines by using a double-haploid technology; carrying out multi-point field phenotype identification and combining ability determination on the DH population, selecting individual plants with good performance, carrying out molecular marker identification, and analyzing and mining target trait associated marker loci; establishing a whole-genome selection model; screening a plurality of best DH lines with the established whole-genome selection model, and carrying out mixing pollination to form a new basic population; utilizing the double-haploid technology again to make the basic population rapidly produce a large number of DH lines, carrying out phenotypic prediction screening by the whole-genome selection model, carrying out multi-point field phenotype identification on the screened excellent plants, and screening good selfing lines; and circulating the steps to improve the basic population, and carrying out selected breeding of more good selfing lines.

Description

technical field [0001] The invention relates to breeding technology, in particular to a method for rapid improvement of corn breeding populations. Background technique [0002] Maize breeding is one of the important directions of agricultural research, and cross breeding is an important way of maize breeding. In maize hybrid breeding, the creation of excellent breeding basic materials is the key to the success of breeding. Commonly used population creation methods include population improvement, pedigree selection, backcross selection, etc., but these methods take a long time for breeding, often requiring 6-8 generations (3-5 years), with little genetic gain and low breeding efficiency. The specific problems that exist are as follows: 1. Low-generation group materials (such as S 1 -S 3 ) is a heterozygous state. Due to the presence of dominant-recessive and gene interactions, phenotypic identification is not accurate and cannot fully represent the phenotypic results of th...

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Problems solved by technology

[0004] The following problems exist in the existing population improvement technology: 1) The cycle is long, and it often takes 5-8 generations; 2) It is difficult to identify the phenotype. The existing technology is often to identify the heterozygous population. , character identification is inaccurate; 3) low genetic gain, because the heterozygous population is selected and identified, the genetic progress obtained is low; 4) it is difficult to directly carry out hybrid breeding, because the heterozygous population is improved, the improved offspring are difficult direct hybrid

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