Method for breeding corn self-bred lines supplementarily and measuring combining ability

Abstract

The invention relates to a method for breeding corn self-bred lines supplementarily and measuring combining ability. The method comprises the following steps of: (1) setting a breeding target of breeding the corn self-bred line; (2) selecting plants of which the roots are prosperous, fruit clusters are not bald and the branch number of tassel is 1 to 10; (3) planting 60 plants densely in a mode of 60,000 plants / hectometer<2>, and bagging for selfing completely during the flower season; (4) measuring the combining ability on excellent single plants which are grown in a field and meet the breeding target in early generation by a method of 'two seeds on one fruit cluster and interval pollination', and matching hybrids; and (5) continuing to perform selfing homozygosis on the self-bred lines which are high in combining ability and good in the expression of comprehensive characters to obtain S4 generation seeds. Due to the adoption of the breeding method of 'two seeds on one fruit cluster and interval pollination', the method has the unique advantages that a large number of self-bred lines and strains which are low in combining ability can be eliminated in the early generation, and the excellent single plants in the field can be conserved and are difficult to lose, so that resources of labor, financial resources and the like are saved. In addition, the combining ability can be measured in the same production season, so that the 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 assisting in breeding corn inbred lines and measuring early generation combining ability. Background technique [0002] Corn is the world's largest crop in terms of total production and per unit yield, the second in trade volume, and the third largest crop after rice and wheat. In recent years, domestic corn consumption has developed from traditional food and feed consumption to many industries such as medicine, food, papermaking, chemical industry, and brewing. Corn is an indispensable raw material for the development of these industries. At the same time, corn is still supplying starch, glucose , lysine, ethanol and other fields of hundreds of industrial raw material consumption changes, especially the increase in demand for alcohol and fuel ethanol further led the corn processing industry to corn consumption. As a natural cross-pollinated crop, ...

AI Technical Summary

Problems solved by technology

If the selection is based on the observation of the performance characteristics of the breeding materials, at least 6-8 selfing generations are required for the selection of the basic materials, so the breeding cycle is relatively long and requires more human and financial resources.