The invention discloses a breeding method of a three-high and one-excellent maize inbred line (FQ920), which belongs to the field of maize breeding, and is characterized in that the maize inbred line (FQ920) is bred by taking an introduced Thailand
germplasm Suwan-3
population as a basic material through an intra-
population mixed
powder gene recombination and multi-generation optimal selection
inbreeding method, and the three-high and one-excellent maize inbred line (FQ920) is bred into the maize inbred line (FQ920). The intra-
population mixed
powder gene recombination and multi-generation optimal selection
selfing comprises the following steps: (A) performing optimal
plant selection and
powder taking mixed sister cross on the basic material population, and performing optimal selection to obtain an S2 strain; (B) selecting strains with good resistance, excellent quality and high yield potential from the strains S2, and performing
selfing to obtain strains S3; according to the method, the breeding procedure is relatively simple, the
operability is high, the success probability is large, the investment of manpower and
material resources is small, the bred corn inbred line (FQ920) has the characteristics of high yield,
high resistance, high matching and high quality, and the assembled new corn variety has the advantages of high yield, high quality, multiple resistance, wide applicability and the like; the problems that high quality is not high, high yield is not high and high yield is not resistant to diseases are solved.