Seed selection method for new strain of maize inbred line

Abstract

The invention relates to a seed selection method for new strain of a maize inbred line, comprising the following steps: taking huangzaosi (seed of maize) and dan 340 (seed of maize) as base materials and mixing to obtain the first generation seed; backcrossing huangzaosi once; then alternately and circularly carrying out inbred for three years continuously in the north and south; planting the first generation in the north in the first summer; sheathing the bags for selfing; selecting the second generation seed with good disease resistance; implementing high-density planting and disease inoculation test in the south in winter; screening for selfing; oppositely crossing with REID line material; selecting the third generation seed with good disease resistance; planting in the north in the second year; screening the fourth generation seed; and implementing planting and selfing in the north in the year; screening the fifth generation seed after combining an ability test; implementing planting and selfing in the north in the third year; implementing disease inoculation test and combining ability identification; preferably selecting the stable sixth generation seed; implementing test identification through assembling and planting in the south; selecting the optimized line after large-scale multipoint planting and identification at different places in the north so as to breed the new strain king128 of maize inbred with strong disease resistance, good yielding performance and wide adaptability.

Description

technical field [0001] The invention relates to the crop production technology, in particular to the breeding technology of new corn strains. Background technique [0002] Corn is an important food crop in my country and occupies an important position in the national economy. After decades of hard work in my country's Huanghuaihai corn ecological region, corn germplasm resources have made great progress. In the past 20 years, the dominant mode of maize breeding in the Huanghuaihai region was improved REID×Tangsipingtou, and the main representative germplasms of Tangsipingtou were Changqi-2 and LX9801. In recent years, the yellow and white varieties have gradually withdrawn from the market, resulting in less application of LX9801, poor lodging resistance and disease resistance of Changqi-2, and there is a potential for large-scale outbreaks of diseases and insect pests due to the fragility of corn genes and the singleness of varieties to reduce corn yields danger. Content...

AI Technical Summary

Problems solved by technology

In recent years, yellow and white varieties have gradually withdrawn from the market, resulting in less application of LX9801, poor lodging resistance and disease resistance of Changqi-2, and there is potential for large-scale outbreaks of diseases and insect pests due to the fragility of corn genes and the singleness of varieties to reduce corn production danger