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Corn variety breeding method

A corn and variety technology, applied in the agricultural field, can solve the problems of many facilities and equipment, poor selection accuracy and high cost, and achieve the effects of accurate results, improved accuracy and reduced breeding costs

Inactive Publication Date: 2017-08-18
DRY LAND FARMING INST OF HEBEI ACAD OF AGRI & FORESTRY SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The main problems in the current breed selection process are as follows. First, the identification of drought resistance generally relies on phenotypic or physiological indicators, and the selection accuracy is poor. Second, the previous drought resistance identification technology relies on many facilities and equipment, which is relatively cumbersome and expensive.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Step 1: Drought resistance screening of basic materials. According to the principle of heterosis model, the existing inbred lines were divided into female parent group (A group) and male parent group (B group) by adopting a circular breeding strategy, and improved within groups. Firstly, we should identify the inbred lines with better drought resistance in the female parent group and the male parent group respectively. During the period, water should be replenished according to the moisture content, and the soil water content should be kept at 55% ± 5% of the field water capacity; non-drought stress treatment should ensure that the water is suitable for the whole growth period, and the soil water content should be kept ≥ 85% of the field water capacity. Each treatment was replicated 3 times, and each inbred line was planted in 2 rows, one of which was all self-crossed, and the other row was used for configuration and combination. Other cultivation and management measure...

Embodiment 2

[0037] The first step: To identify the drought resistance of the own parental resources. The drought resistance index of Zheng 58 in the female parent group is 1.08, and the drought resistance index of H21, 92-8 and 598 in the male parent group are 1.01, 1.04 and 1.06, respectively. Select the combination materials of Zheng 58 and X1132 to enter the next stage; the F1 generation of H21 and 92-8 and the combination materials of 598 enter the next stage.

[0038] The second step: the repeated drought survival rate of F1 seedlings was 83% for Zheng58 / X1132 combination and 74% for H21 / 92-8 / / 598 combination.

[0039] Step 3: Plant 500 plants in each combination of the F2 generation, and select 73 high-quality single panicles in Zheng 58 / X1132 combination, and select high-quality single ears in H21 / 92-8 / / 598 combination through the identification method of "three controls and three selections". There are 66 single spikes and they will enter the next stage.

[0040] The fourth step:...

Embodiment 3

[0046] The first step: To identify the drought resistance of the own parental resources, the drought resistance index of 9046 and 478 in the female parent group was 1.03 and 1.07, respectively, and the drought resistance index of H51 and Chang 7-2 in the male parent group were 1.02 and 1.09, respectively. Select 9046 and 478 combination materials to enter the next stage; H51 and Chang 7-2 will return to Jiaochang 7-2 combination materials to enter the next stage.

[0047] The second step: the repeated drought survival rate of F1 seedlings was 77% for the combination of 9046 / 478 and 70% for the combination of H51 / Chang7-2 / / Chang7-2.

[0048] Step 3: Plant 500 plants for each combination of the F2 generation, and select 84 high-quality single ears from the 9046 / 478 combination through the "three controls and three selections" identification method, and select 84 high-quality single panicles in the H51 / Chang7-2 / / Chang7-2 combination 89 high-quality single spikes were selected amo...

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Abstract

The invention provides a corn variety breeding method. The corn variety breeding method comprises the steps of drought resistance screening of a basic material, drought resistance screening of a selfing line F1-generation, drought resistance screening of a selfing line F2-generation, yield increase screening of a selfing line F3-generation, drought resistance screening of a selfing line F4-generation, hybrid preparation, drought-resisting and high-yield hybrid breeding and the like. In different generations, by adopting the method for identifying three types of drought resistance by introducing repeated drought-condition seedling survival rate, drought resisting indexes and 'three controls and three selections' according to the different characteristics of the generations, comprehensive assessment on drought resistance is performed, results are accurate and reliable, and the line selecting accuracy is improved.

Description

technical field [0001] The invention relates to the field of agricultural technology, in particular to a method for breeding corn varieties. Background technique [0002] The main problems in the current breed selection process are as follows. First, the identification of drought resistance generally relies on phenotypic or physiological indicators, and the selection accuracy is poor. Second, the previous drought resistance identification technology relies on many facilities and equipment, which is relatively cumbersome and expensive. . Contents of the invention [0003] The purpose of the present invention is to solve the above-mentioned defects in the prior art, and to provide a method for identifying and screening drought resistance of maize at different stages in the process of creating inbred lines and selecting hybrids, so as to finally shorten the breeding cycle, A method for improving breeding efficiency and directional breeding of drought-resistant and high-yield...

Claims

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Application Information

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IPC IPC(8): A01H1/04A01H1/02
CPCA01H1/02A01H1/04
Inventor 魏建伟谢俊良岳海旺卜俊周柳斌辉彭海成陈淑萍庞昭进张文英李伟郑书宏谢俊雪郭安强
Owner DRY LAND FARMING INST OF HEBEI ACAD OF AGRI & FORESTRY SCI
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