Method for breeding drought-enduring male parent germplasm based on corn PB group

Abstract

The invention relates to the technical field of corn breeding, in particular to a method for breeding drought-enduring male parent germplasm based on a corn PB group. The method comprises the following steps: mixing PB group drought-resistant corn germplasm with a male parent material to construct a germplasm improvement basic group, and selfing to generate an S1 generation; performing inter-ear-row drought resistance screening on the S1 generation in the seedling stage, dividing the screened drought-resistant ear rows into two parts, respectively transplanting the two parts, selecting ear rows correspondingly planted in a normal irrigation area according to the identification result of the drought resistance of the ear rows after planting in an arid area, and performing selfing to obtain an S2 generation and form a DH1 line; taking a small amount of DH1 lines to form a test mating group TC1, performing multi-environment drought resistance phenotype identification on the test mating group TC1 and parent DH1 lines thereof, and respectively establishing whole genome selection models; a whole genome selection model is utilized to predict phenotypes of a large number of DH1 lines, and a screened excellent inbred line is a drought-resistant corn male parent germplasm. The invention aims to solve the problems of long breeding period, low selection efficiency and difficulty in balance of yield and drought tolerance of the existing corn male parent germplasm.

Description

technical field

[0001] The invention relates to the technical field of maize breeding, in particular to a method for breeding drought-tolerant male parent germplasm based on maize PB groups. Background technique

[0002] Corn is the food crop with the largest planting area in China. It has great potential for output and diversified uses, and plays an important role in economic development. For example, in the southern Xinjiang region of my country, the precipitation during the growth period of spring corn is less than 100mm, and the evaporation is as high as 2000mm or more. Although there is a relatively developed drip irrigation system in southern Xinjiang, the massive exploitation of groundwater has caused the groundwater level to drop rapidly, and the river water can only be used after the melting of the snow in the Tianshan Mountains in June, resulting in obvious drought stress during the spring corn seedling and flowering stages. These two periods are the periods when ...

Examples

Embodiment Construction

[0040] Embodiments of the technical solutions of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only used to more clearly illustrate the technical solutions of the present invention, and are therefore only used as examples, and cannot be used to limit the protection scope of the present invention.

[0041] see figure 1 , a method for breeding drought-tolerant male parent germplasm based on maize PB group, comprising the following steps:

[0042] Step 1. Basic group construction

[0043]Based on the identification and screening of drought resistance from maize germplasm, two drought-resistant PB group germplasms of the male parent group were selected to form a basic improvement group. In this example, Dan 598 and Tie 7922 were screened out from maize germplasm using drought resistance identification. The PB group from Pioneer in the United States contains tropical and subtropical genetic germpla...

technical field

[0001] The invention relates to the technical field of maize breeding, in particular to a method for breeding drought-tolerant male parent germplasm based on maize PB groups. Background technique

[0002] Corn is the food crop with the largest planting area in China. It has great potential for output and diversified uses, and plays an important role in economic development. For example, in the southern Xinjiang region of my country, the precipitation during the growth period of spring corn is less than 100mm, and the evaporation is as high as 2000mm or more. Although there is a relatively developed drip irrigation system in southern Xinjiang, the massive exploitation of groundwater has caused the groundwater level to drop rapidly, and the river water can only be used after the melting of the snow in the Tianshan Mountains in June, resulting in obvious drought stress during the spring corn seedling and flowering stages. These two periods are the periods when ...

Examples

Embodiment Construction

[0040] Embodiments of the technical solutions of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only used to more clearly illustrate the technical solutions of the present invention, and are therefore only used as examples, and cannot be used to limit the protection scope of the present invention.

[0041] see figure 1 , a method for breeding drought-tolerant male parent germplasm based on maize PB group, comprising the following steps:

[0042] Step 1. Basic group construction

[0043]Based on the identification and screening of drought resistance from maize germplasm, two drought-resistant PB group germplasms of the male parent group were selected to form a basic improvement group. In this example, Dan 598 and Tie 7922 were screened out from maize germplasm using drought resistance identification. The PB group from Pioneer in the United States contains tropical and subtropical genetic germpla...

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