Multi-ecology, wide-adaptation, multi-resistance and population improvement breeding system with increasing breeding potential

Abstract

The invention discloses a multi-ecological wide-adaptation multi-resistance and breeding-potentiality-incremental population improvement breeding system which comprises the steps of selection of three groups of high-quality germplasms for matching recurrent selection initial populations, resistance selection, amphiploid and haploid breeding, DH system testing, combining ability testing, application of a DH system in breeding, matching a second recurrent initial population, and the like. The multi-ecological wide-adaptation multi-resistance and breeding-potentiality-incremental population improvement breeding system provided by the invention advocates that recurrent selection in the aspects of synthetic resistance to pests and diseases, lodging resistance, yield and the like is performed under a multi-ecological condition, and population interchanging and mutual combination are performed to polymerize valuable genes which are multi-resistant, high-yield, widely-adaptive and the like, so that the hereditary basis of a recurrent selection population can be continuously extended, and the breeding performance is continuously improved.

Description

technical field [0001] The invention relates to a multi-ecology, wide-adaptation, multi-resistance and population improvement breeding system with increasing breeding potential. Background technique [0002] Corn is the largest crop in terms of area and output in my country and the largest crop in the world. At present, the yield per unit area of ​​corn in my country is only 5416.7 kg / ha (2008), which is far lower than the 10000 kg / ha in the United States (2005). The maximum yield of corn in a small area in my country is about 15,000 kg / ha, which is far lower than the 27,750 kg / ha in the high-yield competition in the United States (created by Francis Childs in Iowa, USA in 2002). In the past one or two decades, the trend of corn breeding in the world is to improve the comprehensive stress resistance of varieties to increase the yield of corn populations, and the density is gradually increasing. For example, in the 1930s in the United States, the planting density was less t...

AI Technical Summary

Problems solved by technology

The germplasm expansion plan of the United States (including the Americas) in the new century is mainly based on the top-crossing method of superior lines and hybrid combinations based on a large amount of previous breeding work. Although the yield increase is relatively large after obtaining an excellent germplasm, However, germplasm in tropical and subtropical regions has a process of domestication, and its combination form is also similar to the narrow-basic method, which is difficult to implement under the current breeding system in our country.