Construction method of warm corn Suwan-Iodent population

Abstract

The invention discloses a construction method of a warm corn Suwan-Iodent population. Through years of experiments, the method utilizes other temperate zone germplasm groups to improve the tropical germplasm, so that the advantages of overcoming the photosensitivity, reducing the plant height, advancing the growth period and the like are achieved; based on the complementary advantages of the characters of the heat source Suwan and the temperate zone Iodent germplasm, by adopting the strategy of a large-population directional backcross method, the difficulty and breakthrough for solving the problem of light sensitivity of the temperate zone corn germplasm are accurately found, the germplasm foundation is provided for widening the existing temperate zone corn germplasm, the acquired population plants are compact in shape, strong in resistance to toppling, moderate in ear position ratio, slightly late in growth period, strong in resistance to stress and the like; therefore, a new theoretical and technical support for widening temperate zone corn germplasm is provided in China and genetic diversity is enriched .

Description

technical field [0001] The invention relates to the technical field of crop breeding, in particular to a method for constructing warm maize Suwan-Iodent populations. Background technique [0002] The history of maize development in the world shows that the successful domestication of tropical maize germplasm (low latitude) to temperate (high latitude) regions has led to changes in maize yield (substantially increased). Since the 1980s, Chinese maize breeders have carried out a lot of research work on the introduction, improvement and innovation of tropical maize germplasm; it has played a huge role in promoting maize breeding and production in my country, laying the foundation for food security and people's income increase. However, due to the temperature and light sensitivity of tropical and subtropical maize germplasm, plant height, late growth period, poor lodging resistance and other adverse traits seriously affect the improvement and utilization of tropical and subtropi...

AI Technical Summary

Problems solved by technology

However, due to the temperature and light sensitivity of tropical and subtropical maize germplasm, plant height, late growth period, poor lodging resistance and other adverse traits seriously affect the improvement and utilization of tropical and subtropical maize germplasm; resulting in the homogeneity of maize hybrid varieties and germplasm base in temperate regions Globalization is serious, and the ability of agricultural productivity to resist natural disasters is more vulnerable

Since the beginning of the 21st century, due to the time-consuming and labor-intensive introduction, improvement and application of tropical germplasm, long improvement cycle and low breeding production efficiency, Chinese maize breeders have not paid enough attention to it.

[0003] In view of the current status of the genetic basis of maize germplasm in my country, the improvement and utilization methods of tropical maize germplasm are mainly population improvement and the two-ring method; population improvement is an effective method for tropical germplasm improvement, but the workload is heavy, the cost is high, and the cycle is long Not enough

The two-ring method is the most commonly used method in commercial breeding and the most effective embodiment of short, smooth and fast breeding; however, the utilization efficiency of tropical maize germplasm improvement is still

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