Inbred line breeding method for corns in mountainous area

Abstract

The invention discloses an inbred line breeding method for corns in a mountainous area. The method comprises the following steps: (1) identifying and evaluating corn germplasm resources in different ecological environments respectively; (2) improving GCAs (general combining abilities) of local cultivars by virtue of existing high-quality inbred lines, performing isolated inbreeding to implement self-producing, and evaluating combining abilities of inbred lines by virtue of a diallel cross method; (3) breeding second cycle lines or inbred lines of exotic varieties; (4) breeding inbred lines with wide adaptabilities and high combining abilities as female parents (male parents) by virtue of local corn germplasm materials, and breeding new hybrid corn varieties by utilizing the second cycle lines or the inbred lines of the exotic varieties as the male parents (female parents); (5) homozygously inbreeding the male parents and the female parents, performing test crossing, performing variety comparison, and selecting high-quality combinations to obtain new corn varieties. According to the method, for the geographic and climatic characteristics of the Wuling mountainous area, the heterotic pattern of doping the corns of the Wuling mountainous area with the inbred lines of the local germplasms and the exotic varities is utilized, the existing corn germplasm resources are identified and improved, the existing germplasm resources with high combining abilities, quality and resistance are divided into two heterotic groups, and then novel breaking breeding materials are produced. The problems of poor variety adaptability, low yield, low resistance, poor quality and the like are solved.

Description

technical field [0001] The invention relates to a seed production technology of corn hybrids, which belongs to the technical field of new agricultural seed breeding, in particular to a method for breeding corn inbred lines in mountainous areas. Background technique [0002] Corn is one of the three major grain crops in my country, with a total output of 191.75 million tons, accounting for 26% of the grain planting area and 30% of the total grain output. It plays a pivotal role in ensuring national food security and increasing farmers' income. Southwest mountainous areas, especially Wuling mountainous areas, are one of the three major corn producing areas in my country and the main battlefield for corn planting in the south, accounting for 16% of the country’s corn planting area and 14% of the total grain output. The development of the corn industry will benefit the people in the mountainous areas. The development and construction of the country's western region and the contig...

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the above-mentioned deficiencies in the prior art and provide a method for breeding corn inbred lines in mountainous areas. The method is aimed at the geographical and climate characteristics of Wuling mountainous areas, and uses corn in Wuling mountainous areas to blend local germplasm inbred lines × foreign introduction The utilization mode of heterosis is used to identify and improve the existing maize germplasm resources, and the existing germplasm resources with high combining ability, high quality and good resistance are divided into two heterosis groups, and a breakthrough new breeding method is produced. materials, which solve the problems of poor variety adaptability, low yield, low resistance, and poor quality

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