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| Development and application of marker-assisted reverse breeding using hybrid maize germplasm |
| GUAN Yi-Xin, WANG Bao-hua, FENG Yan, LI Ping |
1、Scientific Observing and Experimental Station of Maize in Plain Area of Southern Region, Ministry of Agriculture/School of Life
Sciences, Nantong University, Nantong 226019, P.R.China
2、Northeast Institute of Geography and Agroecology, Chinese Acade my of Sciences, Changchun 130102, P.R.China
3、Nantong Xinhe Bio-Technology Co., Ltd., Nantong 226010, P.R.Chi na |
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摘要 Humankind has been through different periods of agricultural improvement aiming at enhancing our food supply and the performance of food crops. In recent years, whole genome sequencing and deep understanding of genetic and epigenetic mechanisms have facilitated new plant breeding approaches to meet the challenge of growing population, dwindling resources, and changing climate. Here we proposed a simple and fast molecular breeding method, marker-assisted reverse breeding (MARB), which will revert any maize hybrid into inbred lines with any level of required similarity to its original parent lines. Since all the pericarp DNA of a hybrid is from the maternal parent, whereas one half of the embryo DNA is from the maternal parent and the other half from the paternal parent, so we firstly extract DNA from seed embryo and pericarp of a selected elite hybrid separately and then we derived the genotypes of the two parents with high-density single nucleotide polymorphism (SNP) chips. The following marker-assisted selection was performed based on an Illumina low-density SNP chip designed with 192 SNPs polymorphic between the two parental genotypes, which were uniformly distributed on 10 maize chromosomes. This method has the advantages of fast speed, fixed heterotic mode, and quick recovery of beneficial parental genotypes compared to traditional pedigree breeding using elite hybrids. Meanwhile, MARB has the advantage of not requiring sophisticated transformation and double haploid (DH) technologies over RNA interference (RNAi)-mediated reverse breeding. In addition, MARB can also be used with feed corn harvested from big farms, which is often similar to F2 populations, and the relevant transgenes in the population can be eliminated by marker-assisted selection. As a result, the whole global commercial maize hybrids can be utilized as germplasm for breeding with MARB technology. Starting with an F2 population derived from an elite hybrid, our experiment indicates that with three cycles of marker-assisted selection, selected lines could recover over 80% of the parental genotypes and associated beneficial genes in a fixed heterotic mode. The success application of MARB in maize suggests that this technology is applicable to any hybrid crop to breed new inbreds with improved hybrid performance but the same heterotic mode. As chip technology becomes cheap, it would be expected that polymorphism screening and following marker-assisted selection could be done with one all-purpose high density chip.Several issues associated with MARB were discussed, including its rationale, efficiency and advantages, along with food/ feed and environmental safety issues and applications of MARB in variety protection and marker-assisted plant breeding.
Abstract Humankind has been through different periods of agricultural improvement aiming at enhancing our food supply and the performance of food crops. In recent years, whole genome sequencing and deep understanding of genetic and epigenetic mechanisms have facilitated new plant breeding approaches to meet the challenge of growing population, dwindling resources, and changing climate. Here we proposed a simple and fast molecular breeding method, marker-assisted reverse breeding (MARB), which will revert any maize hybrid into inbred lines with any level of required similarity to its original parent lines. Since all the pericarp DNA of a hybrid is from the maternal parent, whereas one half of the embryo DNA is from the maternal parent and the other half from the paternal parent, so we firstly extract DNA from seed embryo and pericarp of a selected elite hybrid separately and then we derived the genotypes of the two parents with high-density single nucleotide polymorphism (SNP) chips. The following marker-assisted selection was performed based on an Illumina low-density SNP chip designed with 192 SNPs polymorphic between the two parental genotypes, which were uniformly distributed on 10 maize chromosomes. This method has the advantages of fast speed, fixed heterotic mode, and quick recovery of beneficial parental genotypes compared to traditional pedigree breeding using elite hybrids. Meanwhile, MARB has the advantage of not requiring sophisticated transformation and double haploid (DH) technologies over RNA interference (RNAi)-mediated reverse breeding. In addition, MARB can also be used with feed corn harvested from big farms, which is often similar to F2 populations, and the relevant transgenes in the population can be eliminated by marker-assisted selection. As a result, the whole global commercial maize hybrids can be utilized as germplasm for breeding with MARB technology. Starting with an F2 population derived from an elite hybrid, our experiment indicates that with three cycles of marker-assisted selection, selected lines could recover over 80% of the parental genotypes and associated beneficial genes in a fixed heterotic mode. The success application of MARB in maize suggests that this technology is applicable to any hybrid crop to breed new inbreds with improved hybrid performance but the same heterotic mode. As chip technology becomes cheap, it would be expected that polymorphism screening and following marker-assisted selection could be done with one all-purpose high density chip.Several issues associated with MARB were discussed, including its rationale, efficiency and advantages, along with food/ feed and environmental safety issues and applications of MARB in variety protection and marker-assisted plant breeding.
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Received: 23 November 2014
Accepted:
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| Fund: This work was supported by the Jilin Spring Corn and Rice High Yield Production System in Large Area, a project of Ministry of Science and Technology, China (2012BAD04B02), the Open Fund from Ministry of Agricultural Scientific Observing and Experimental Station of Maize in Plain Area of Southern Region, China (NT201405), the Agriculture Technological Innovation and Industrialization Project of Nantong City, China (HL2013026), and Autonomous Innovation Project of Jiangsu Agricultural Science & Technology, China (CX(15)1005). |
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Corresponding Authors:
LI Ping, Tel: +86-513-85012828, Mobile: +86-15106297966,E-mail: pingli6@hotmail.com
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| About author: GUAN Yi-xin, E-mail: guanyixin@126.com;* These authors contributed equally to this study. |
Cite this article:
GUAN Yi-Xin, WANG Bao-hua, FENG Yan, LI Ping.
2015.
Development and application of marker-assisted reverse breeding using hybrid maize germplasm. Journal of Integrative Agriculture, 14(12): 2538-2546.
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