Breeding method for P-group maize inbred line Lx286

Abstract

The invention relates to a breeding method for a P-group maize inbred line Lx286. The method comprises the steps that a base material of an S0 generation of Y928 / C486 is constructed by taking Y928 andC486 as male and female parents in Jinan; the S0 generation is inbred in Hainan so as to obtain an S1 generation, and meanwhile, a tester C138 and the S0 generation thereof are combined so as to obtain a combination C138 / S0; according to the yield and the field performances (lodging resistance and disease resistance) of the hybridized combination C138 / S0 in Jinan, the Y928 / C486 is considered to establish base population offspring suitable for line selection; S1 offspring population of the Y928 / C486 is planted in Zhangye, Gansu, and early-maturing S2 single plants with good comprehensive characters are selected; the S2 single plants are planted into head progeny rows in Hainan, and the head progeny rows are subjected to test cross through the tester C138, and S3 head progeny rows with excellent comprehensive characters are selected in the harvesting process; S3 single plants of the selected head progeny rows are planted into head progeny rows and are inbred in Jinan so as to obtain S4,and S4 with higher combining ability is selected according to the field performances and the yield test result of a test cross combination and the comprehensive performances of the S3 head progeny rows; and bagging inbreeding is continuously carried out in Hainan and Jinan, and finally, the maize inbred line Lx286 is bred according to different test results of the tester.

Description

technical field [0001] The invention belongs to the field of agricultural science and technology, and in particular relates to a method for breeding a P group maize inbred line Lx286. Background technique [0002] Breeding is a very cyclical work. It usually takes 10-15 years to breed a variety, and most of the breeding time is spent on line selection. The breeding process is actually the process of line selection. Line selection is An important part of maize breeding. The purpose of line selection is to achieve continuous recombination and aggregation of excellent genes to create new inbred lines. With excellent inbred lines, excellent hybrids will definitely be produced. [0003] In order to ensure the success rate of breeding inbred lines, methods such as large populations, high-density screening, and early generation combining ability tests are generally used. Lines become possible, so that the breeding cycle can be shortened to 2 years. However, we only focused on t...

AI Technical Summary

Problems solved by technology

However, we only focused on the advancement of technological means, and did not realize from the beginning whether the combined corn basic material is suitable for selection, that is, whether the offspring of this group have high combining ability. If the offspring group does not have good combining ability, All our technical means don't work

At the same time, we did not pay attention to whether the inbred lines we bred have high combining ability, but whether they can meet the needs of Northwest seed production, especially the P group inbred lines with tropical blood are sensitive to light and temperature, and the flowering period is late , the flowering interval of the parents is long, and there is a greater risk in seed production