Breeding method of a strong dominant warm corn hybrid

Abstract

The invention relates to a breeding method of strong dominant temperate and tropical corn hybrids. The breeding method comprises the following steps: (1) material selection: selecting temperate inbred lines A, B, C and D with excellent comprehensive characters as well as tropical inbred lines L, M, N and K; (2) breeding method: firstly respectively matching A*M and B*L temperate-tropical hybrids, hybridizing the hybrids A*M with the N, then hybridizing the K to obtain a BC1 backcrossing group, hybridizing the hybrids B*L with the C, and then hybridizing the D to obtain a BC2 backcrossing group; later continuously selecting superior individuals from the respective backcrossing groups for selfing, breeding into a newly-improved temperate inbred line A and a newly-improved tropical inbred line L, hybridizing the newly-improved temperate inbred line A and the newly-improved tropical inbred line L, breeding into a temperate and tropical new temperate-tropical hybrid A temperate*L tropical. The breeding method provided by the invention is simple, low in preparation cost and high in efficiency.

Description

technical field [0001] The invention relates to the technical field of plant breeding, in particular to a method for breeding a strong dominant warm-heat hybrid corn. Background technique [0002] Corn is an important food, feed crop and industrial raw material. With the rapid development of the economy, the demand for corn is also increasing. The problem, which severely restricts the production of corn, does not match the situation of a large increase in demand. Hybrid vigor is a common phenomenon in the biological world. It generally refers to the phenomenon that hybrids are superior to their parents in terms of production potential, stress resistance, applicability, yield, and quality. Shull first proposed the term "heterosis" in 1908. A term and the basic procedure of single-cross breeding have laid the foundation for the utilization of heterosis in maize from the perspective of genetic theory and breeding model. [0003] Maize hybrid breeding mainly uses two types of ...

AI Technical Summary

Problems solved by technology

This method uses warm hybridization (or backcross) to directly select lines, which is simple and easy to implement, and it is also possible to successfully breed hybrid combinations with certain tropical ancestry, but it also has many defects. The heterogeneous group of the line is not clear, and the genetic basis is narrow, which makes it more difficult to assemble hybrids; some backcross improvements have the uncertainty of the selection of the number of backcrosses for the subsequent selection of lines; for example, if there are too many backcrosses in tropical materials, then Defects such as low economic yield, obvious photoperiod response, poor plant and leaf type, and uncoordinated sexes, etc. If temperate materials are backcrossed more often, more disease-resistant genes will be easily lost, and the resistance will decrease, and the expected high-resistant selection line will not be achieved. Material