One-hole-multiple-plants inbred line breeding method capable of enhancing density-tolerant property and lodging resistance of maize

An inbred line and lodging resistance technology, applied in the field of inbred line selection and breeding, can solve the problems of neglecting soil nutrient competition, density tolerance, poor lodging resistance, and inability to withstand density and lodging resistance material breeding, etc. The effect of density and root lodging resistance

Active Publication Date: 2017-08-22
BEIJING ACADEMY OF AGRICULTURE & FORESTRY SCIENCES
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AI Technical Summary

Problems solved by technology

However, the traditional selection method for density resistance is uniform distribution, focusing on the selection of density resistance on the ground, ignoring the competition of soil nutrients between different plants, and it is impossible to truly realize the selection of density resistance and lodging resistance materials.
[0003] In order to solve the problems of poor density tolerance and lodging resistance of most maize inbred lines at present, we proposed a new type of inbred line selection that can enhance the density tolerance and lodging resistance of maize based on genetic breeding theory and combined with breeding practice. Breeding method, realizing another breakthrough in inbred line breeding method

Method used

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  • One-hole-multiple-plants inbred line breeding method capable of enhancing density-tolerant property and lodging resistance of maize

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Experimental program
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Effect test

Embodiment 1

[0037] according to figure 1 The process of carrying out the comparison test of planting density in the breeding of maize density-tolerant and lodging-resistant inbred lines is as follows:

[0038] A. In Beijing in 2014, the inbred lines Jing 92 and Jing 2416 were crossed with each other to obtain the Jing 92×Jing 2416 hybrid combination, and the resulting hybrid seeds were planted to obtain S 0 100 generation plants were selected, and 50 well-grown plants were selected for bagging and selfing; 30 selfing ears were obtained, and the grains on them were used as S 1 generation seeds.

[0039] B.S 1 Generation begins to segregate traits, so it is called S 1 On behalf of the selected line of basic groups. The Beijing Xiaotangshan Breeding Base was planted according to 3 planting densities of 8000 plants / mu (2 plants per hole), 12000 plants / mu (3 plants per hole), and 18000 plants / mu (3 plants per hole). During flowering to S 1 The male and female coordinated individual plant...

Embodiment 2

[0052] according to figure 1 According to the flow chart, the planting mode comparison test of the selection and breeding of maize density-tolerant and lodging-resistant inbred lines is carried out, as follows:

[0053] A. In Beijing in 2014, the inbred lines Jing 92 and Jing 2416 of the Huanggai line were selected and crossed with each other to obtain a hybrid combination of Jing 92×Jing 2416, and the resulting hybrid seeds were planted to obtain S 0 100 generation plants were selected, and 50 well-grown plants were selected for bagging and selfing; 30 selfing ears were obtained, and the grains on them were used as S 1 generation seeds.

[0054] B.S 1 Generation begins to segregate traits, so it is called S 1 On behalf of the selected line of basic groups. In Beijing Xiaotangshan Breeding Base, planting was carried out according to the planting density of 12,000 plants / mu and the planting mode of 1 plant per hole, 3 plants per hole, and 5 plants per hole, with a row spaci...

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Abstract

The invention provides a one-hole-multiple-plants inbred line breeding method capable of enhancing the density-tolerant property and lodging resistance of maize. The method comprises the following steps that firstly, hybrid seeds obtained through hybridization of two excellent maize varieties serve as S0 generation of seeds, superior plants selected from the S0 generation to be inbred, and S1 generation of seeds are obtained; secondly, the S1 generation is planted in a one hole-multiple-plants mode at high density, female and male coordinated individual plants are inbred, and seed reservation is conducted on each inbred ear with the grain weight per ear in the top 10%; thirdly, the S2 generation is planted in the one hole-multiple-plants mode at high density according to ear rows, the female and male coordinated individual plants are selected in five holes at one end of each ear row to be inbred, the other individual plants are subjected to open pollination, and triple screening is conducted on the ear rows; fourthly, the S3 generation is planted, the S3 generation and 4-5 existing common inbred lines are subjected to test cross, multi-point testing is conducted on the test cross F1, screening is conducted according to high adaptability, good quality, ordinary yield and high combining ability, and the selected ear rows are the maize density-tolerant lodging-resistant inbred lines. By means of the method, the underground root system and aerial roots of the bred inbred lines are very developed, and the maize has good density-tolerant and lodging-resistant abilities.

Description

technical field [0001] The invention relates to breeding technology, in particular to a breeding method for inbred lines for enhancing the density resistance and lodging resistance of maize with multiple plants in one hole. Background technique [0002] At present, the density tolerance and lodging resistance of most corn inbred lines on the market cannot meet the development requirements of the corn mechanization process, and the problems of lodging and downturning are very serious. Especially the root lodging will seriously affect important links such as seed production and approval of hybrids, and is a fatal defect of maize inbred lines. By increasing the breeding density, the density tolerance and lodging resistance of the varieties can be increased. However, the traditional selection method for density resistance is uniform distribution, focusing on the selection of density resistance on the ground, ignoring the competition of soil nutrients between different plants, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A01H1/02A01H1/04
CPCA01H1/02A01H1/04
Inventor 赵久然王元东张如养刘新香宋伟邢锦丰
Owner BEIJING ACADEMY OF AGRICULTURE & FORESTRY SCIENCES
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