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Molecular breeding method for improving cotton fiber length, fiber strength, and micronaire value

A technology of fiber strength and micronaire value, applied in the field of molecular breeding, to achieve the effect of increasing fiber length, long breeding cycle and increasing fiber strength

Inactive Publication Date: 2012-11-07
NANJING AGRICULTURAL UNIVERSITY
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  • Application Information

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Problems solved by technology

However, the offspring of the two hybrids showed the typical crazy separation of interspecific hybridization. Cotton breeders have been trying to breed new varieties with high yield of upland cotton and high-quality sea-island cotton, but have not been successful.

Method used

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  • Molecular breeding method for improving cotton fiber length, fiber strength, and micronaire value

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Embodiment Construction

[0016] Selected parents: The Cotton Research Institute of the State Key Laboratory of Crop Genetics and Germplasm Innovation of Nanjing Agricultural University uses the upland cotton genetic standard line TM-1 as the recurrent parent, and the disease-resistant and high-quality Sea Island Cotton Sea 7124 strain as the donor parent (non-recurrent parent) , combined with SSR molecular marker-assisted selection covering the whole genome in the high generation of backcrossing, 174 sea-island cotton chromosome segment introduction lines with the background of TM-1, the first domestic upland cotton genetic standard line, were bred, and the genome coverage rate reached 83.5%. Through the continuous 2-year cotton fiber quality inspection of the sea-island cotton chromosome segment introduction line, the introduction line IL080-D6-1 with significantly better fiber length than the control was screened out. The fiber length of the introduction system is 31.5-32.5mm, the fiber strength is 3...

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Abstract

The invention relates to a molecular breeding method for improving cotton fiber lengths, fiber strengths, and micronaire values. The method is applied in oriented improving of crop (cotton) agronomic properties, and in selective breeding of novel breeds. According to the invention, cotton fiber quality detection is carried out upon gossypium barbadense chromosome segment introgression lines (CSIL), and an introgression line IL080-D6-1 with substantially increased fiber length and fiber strength, and substantially reduced micronaire value is selected. The introgression line is regarded as a non-backcross parent, and Xinluzao No.38, which is a breed from Xinjiang cotton region, is regarded as a backcross parent. Crossing is carried out between the two. The resulting breeds are backcrossed for 2 generations and self for 3 generations. With molecular marker auxiliary selection, a novel cotton line with good fiber length, fiber strength, and micronaire value is obtained. With the method, anovel high-quality and high-yield cotton line, which is Nannong gossypium barbadense No.2, is obtained.

Description

[0001] (1) Technical field: The present invention is a molecular breeding method for improving cotton fiber length, fiber strength and micronaire value by using the introduction line of sea-island cotton chromosome fragments, which is specially used for rapid and effective breeding and production of fiber length, fiber strength and horsepower New cotton lines (new varieties) with excellent clone values. (2) Background technology: [0002] Cotton is an important economic crop worldwide. China is a big cotton producer, consumer and textile country. As a major cotton-producing country, my country's main cotton-producing areas cover 16 provinces, municipalities (autonomous regions), with an annual cotton planting area of ​​70-80 million mu, with a total output of about 6 million tons, accounting for a quarter of the world's total output. With the advancement of textile technology, textile products have also developed from coarse-count yarns to high-count yarns and even spun yarn...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C12Q1/68A01H1/02A01H1/04A01H5/00
Inventor 张天真王鹏郭旺珍曹志斌
Owner NANJING AGRICULTURAL UNIVERSITY
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