Breeding method of br-2 short-gene-type maize dwarf 268

Abstract

The invention relates to a breeding method of a br-2 short-gene-type maize dwarf 268. The method comprises the following steps of: breeding a dwarf maize selfing line Yong 126 by taking a dwarf maize selfing line Ji 159, a common maize selfing line 8112 and a common maize selfing line Zheng 58 as background materials; breeding a dwarf maize selfing line Yong 872 by taking a dwarf maize selfing line Ji 35-8, a common maize selfing line Lian 1538 and a common maize selfing line Chang 7-2 as the background materials; and performing the cross breeding to breed the short hybrid maize swarf 268 by taking the dwarf maize selfing line Yong 126 as a female parent and the dwarf maize selfing line Yong 872 as a male parent. The method has the advantages that the maize is short, low in corncob, resistant to disease and falling, appropriate for close planting, high in yield, large in yield-increasing potential and suitable for mechanical harvesting. Therefore, the method has the great significances for improving the maize yield, developing the animal husbandry and improving the living standards of people.

Description

technical field [0001] The invention relates to a breeding method of a corn variety, in particular to a breeding method of the br-2 dwarf genotype corn Aidan 268. Background technique [0002] In recent years, the yield of summer-sowed corn in my country has increased slowly, and the yield per mu is generally between 500 and 600 kg. Experts agree that the main factors affecting the further increase of corn yield are: the corn varieties selected in my country have relatively large plants, some varieties have a plant height of more than 3 meters, poor lodging resistance, and are not resistant to dense planting. The field planting density is generally maintained at 4000-4500 Among the plants / mu, there are 1500-2000 plants less than the 6000 plants / mu in the United States, but there are still serious lodging phenomena all the year round, resulting in different degrees of production reduction. According to the practice of agricultural breeding, the br-2 dwarf genotype maize h...

AI Technical Summary

Problems solved by technology

[0004] In the early 1980s, the Grain and Oil Crops Research Institute of the Hebei Academy of Agricultural Sciences used the br-2 dwarf genotype corn inbred line to cross with the common stem height corn inbred line to form a single-cross variety, and then carried out self-segregation screening to breed Ji 159 and Ji 35-8 are two dwarf inbred lines whose phenotype has overcome the bad traits mentioned above, but there are also some unsatisfactory features

Among them, Ji 159 has a weak root system and is easy to lodging; Ji 35-8 has a bow-shaped ear node and is easy to break, which are not suitable for large-scale application.

Images