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Breeding method for inbred-line new strain of high-yield multi-resistance high combining ability corn

A new line, inbred line technology, applied in the directions of botanical equipment and methods, application, plant genetic improvement, etc., can solve the problems of serious pests and diseases, difficulty in adapting varieties, limiting the level of corn breeding, etc., and achieve the effect of good compatibility

Pending Publication Date: 2018-11-09
MAIZE RES INST GUANGXI ACADEMY OF AGRI SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, with the passage of time, this genetic basis of only temperate germplasm has gradually become a bottleneck factor limiting the further improvement of maize breeding
Guangxi is located in tropical and subtropical regions, with many ecological types and great differences in farming and cultivation conditions. Most of the corn production areas are mountainous and hilly, with little rain, little sunshine, barren soil, and serious pests and diseases. The production requires high variety and wide adaptability of corn varieties; With temperate germplasm, it is increasingly difficult to breed high-yielding, disease-resistant varieties with wide adaptability

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Example 1 : Breeding method of maize line PS group

[0028] (1) Spring 2003 for DKO08F, OA110, S313, S Mengwu, S8232, Stai 41, S38M, Stai 152, S84-6, SHY41, S152, NF818-61, SW8211, SP220, SW8241, SD90131, Y708M , F880, Xian 09121, GO081 and more than 30 self-bred lines passed the genetic diversity analysis;

[0029] (2) In the autumn of 2003, according to the results of genetic diversity analysis, ten genetically distant and containing Su Plant the same amount of seeds as the blood source material, and obtain the maize breeding population after fully mixing and crossing;

[0030] (3) The PS population was improved by applying the mixed selection method in Nanning, Baise, and Yizhou for four rounds from spring 2004 to autumn 2005, respectively, to select and improve the population's resistance, high grain yield and composition traits; in this In the step, the planting density is selected to be 60000 plants / hm 2 .

Embodiment 2

[0031] Example 2 : Breeding method of new maize inbred line SP221

[0032] (1) In 2006, the inventor selected ten groups with similar genetic distances and containing Suwan blood-derived material groups group and the corn group PS group obtained through improvement. From the spring of 2006 to the spring of 2007, the pedigree method was used to select the best plants from the population for selfing and selection to the S3 generation. In this step, the planting density was selected to be 60,000 plants / hm 2 ;

[0033](2) The combining ability of the S3 strain was determined in the autumn of 2007, and the PS05-2-2-1, PS05-2-2-2 and PS05-2-2-6 strains were identified in the autumn of 2008. In this step, choose a planting density of 60,000 plants / hm 2 ;

[0034] (3) In the spring of 2009, the circular breeding strategy was applied, and PS05-2-2-1, PS05-2-2-2 and PS05-2-2-6 from the same population were used to form the basic material (SP-2- 2-1×SP-2-2-2×SP-2-2-6) for line sel...

Embodiment 3

[0036] Example 3 : Stress resistance, quality and utilization of SP221

[0037] (1) Stress resistance of SP221

[0038] The Institute of Plant Protection of Guangxi Academy of Agricultural Sciences identified the stress resistance of SP221. The identification method was carried out according to conventional techniques. The identification results are as follows: the inoculation level of southern rust is level 1, which is highly resistant; the inoculation level of large leaf spot is 1 The inoculation identification of small spot disease is level 1, which belongs to high resistance; the disease level of sheath blight inoculation identification is level 3, which belongs to high resistance; High resistance. Seedling pot plant drought-rewatering test in 2014 and 2015 and observation results of field drought tolerance for many years, the drought tolerance is above average.

[0039] (2) Quality of SP221

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Abstract

The invention belongs to the technical field of corn breeding, and particularly relates to a breeding method for an inbred-line new strain of high-yield multi-resistance high combining ability corn. According to the breeding method, the inbred-line new strain of the high-yield multi-resistance high combining ability corn is bred through selfing of optimal plants of a corn strain PS group. The breeding method has the advantages that the PS group serving as a basic breeding material has high resistance, high appearance quality and high fecundity, and cyclic breeding and high-density selection stress strategies are adopted, so that the obtained SP221 integrates excellent traits such as high yield with multi-resistance and high combining ability, and can be applied to preparation of good cornhydrids and served as a basis material for corn variety improvement.

Description

technical field [0001] The invention belongs to the technical field of corn breeding, and in particular relates to a breeding method for a high-yielding, multi-resistant, and high-matching new line of corn inbred lines. Background technique [0002] Corn originated in South America and was introduced to China in 1556 AD. After hundreds of years of cultivation, it has formed a wealth of types and varieties. Corn is the world's largest food crop. my country's corn planting area has stabilized at 30 million hectares in recent years 2 More than 34.949 million hm in 2012 2 , with a total output of 208.12 million tons, surpassing rice production and becoming my country's largest food crop. Corn is not only food, but also an important feed crop, as well as an industrial raw material and energy plant, and plays an important role in the national economy. [0003] At present, the existing corn varieties in my country cannot meet the production needs, mainly including the varieties...

Claims

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Application Information

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IPC IPC(8): A01H1/02A01H1/04
CPCA01H1/02A01H1/04
Inventor 时成俏覃嘉明郑加兴覃永嫒王兵伟黄安霞宋明贵磨康
Owner MAIZE RES INST GUANGXI ACADEMY OF AGRI SCI
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