Efficient test cross breeding method of maize inbred line combining ability

Abstract

The invention provides an efficient test cross breeding method of maize inbred line combining ability. The method includes: adopting a plant test cross method, only retaining single plants with high combining ability, growing next generations in head progeny rows, and then performing plant test cross till the head progeny rows are stable; secondly, according to a conventional breeding procedure, matching cross combination, performing multi-site test, regional test and the like, and finally breeding a new crossbreed to finish the whole breeding procedure. Compared with the conventional technique, the method has the advantages that the inbred line combining ability can be maintained at a high level, measurement accuracy is high, and efficiency of breeding the inbred lines with high combining ability can be increased by more than 50%. The problem of blindness in combining-ability test cross of the conventional technique is solved, accuracy in breeding the inbred lines with high combining ability is improved, and a foundation is laid for improving efficiency of commercialized maize breeding.

Description

technical field [0001] The invention relates to the field of crop breeding, in particular to a high-efficiency test cross breeding method for combining ability of maize inbred lines. Background technique [0002] Maize is a monoecious, sexually reproducing crop. The main way to increase maize yield is to use maize heterosis. The focus of maize breeding work is to develop maize hybrids. Breeding maize inbred lines is the basis for cultivating maize hybrids; through crossing between inbred lines to prepare maize combinations and breed new maize hybrids. Therefore, the technology of breeding maize inbred lines is the core technology of maize breeding. The traditional breeding technology of maize inbred lines requires years of multi-generational self-selection. After the inbred lines are stable, they are then crossed with test species to prepare test-cross species, and the combining ability is determined, and then excellent inbred lines are selected. and hybrids. However, w...

AI Technical Summary

Problems solved by technology

However, it is not possible to effectively select individual plants with high combining ability in the early generation panicle row of the tested line, which may cause the individual plants with high combining ability to be eliminated or lost due to field performance and other reasons.

Therefore, the selection accuracy is low and the effect is poor

Often after many years of selection, the selfing panicle line is stable, the agronomic traits are good, but the combining ability is not high, it is difficult to breed strong dominant hybrids, and has to be eliminated

Cause waste of manpower, material resources and time

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