A First-Generation Haplotype Map of Maize

Gore, Michael A.; Chia, Jer Ming; Elshire, Robert J.; Sun, Qi; Ersoz, Elhan S.; Hurwitz, Bonnie; Peiffer, Jason A.; McMullen, Michael D.; Grills, George S.; Ross‐Ibarra, Jeffrey; Ware, Doreen; Buckler, Edward S.

doi:10.1126/science.1177837

Cited by 716 publications

(603 citation statements)

References 23 publications

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“…This germplasm is adapted for breeding in Maize proteins (300-400 amino acids long) from 2 alleles differ by 3-4 amino acids Tenaillon et al (2001) Maize genome has 55 million SNPs Gore et al (2009) Green Revolution gene has 2 SNPs for dwarf wheat Peng et al (1999) One SNP caused loss of shattering in domestic rice Konishi et al (2006) Tall or short pea plants (Mendel) Ellis et al (2011) Silva et al (2013) Only 81% of Brassica genes are always present in the same number Golicz et al (2016) 2500 genes found only in either B73 or PH207 Hirsch et al (2016) G. soja genotypes can vary by 1000 to 3000 gene families from each other Li et al (2014) 1992). Nevertheless, breeders are shifting from using these random methods of introducing genetic diversity over the past couple of decades to newer, more predictable methods like genetic engineering.…”

Section: Conventional Plant Breeding Sources Of Genetic Variation Usementioning

confidence: 99%

Bringing New Plant Varieties to Market: Plant Breeding and Selection Practices Advance Beneficial Characteristics while Minimizing Unintended Changes

et al. 2017

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Commercial‐scale plant breeding is a complex process in which new crop varieties are continuously being developed to improve yield and agronomic performance over current varieties. A wide array of naturally occurring genetic changes are sources of new characteristics available to plant breeders. During conventional plant breeding, genetic material is exchanged that has the potential to beneficially or adversely affect plant characteristics. For this reason, commercial‐scale breeders have implemented extensive plant selection practices to identify the top‐performing candidates with the desired characteristics while minimizing the advancement of unintended changes. Selection practices in maize (Zea mays L.) breeding involve phenotypic assessments of thousands of candidate lines throughout hundreds of different environmental conditions over many years. Desirable characteristics can also be introduced through genetic modification. For genetically modified (GM) crops, molecular analysis is used to select transformed plants with a single copy of an intact DNA insert and without disruption of endogenous genes. All the while, GM crops go through the same extensive phenotypic characterization as conventionally bred crops. Data from both conventional and GM maize breeding programs are presented to show the similarities between these two processes.

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Section: Conventional Plant Breeding Sources Of Genetic Variation Usementioning

confidence: 99%

Bringing New Plant Varieties to Market: Plant Breeding and Selection Practices Advance Beneficial Characteristics while Minimizing Unintended Changes

et al. 2017

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“…and Zucc) 75 kb (Lam et al 2010). In contrast, similar levels of LD decay were estimated to occur at <1 kb in maize (Zea mays L.) and wild and cultivated rice (Oryza sativa L.) (Gore et al 2009;Zhu et al 2007). The percentage and total long LD (>150 kb) in cultivated soybean (1.5 %, total length 57.7 Mb) were higher than in wild soybeans (0.6 %, total length 35.7 Mb) and the longest LD block in cultivated soybean was »1 Mb, whereas the longest LD block in wild soybeans was »500 kb (Lam et al 2010).…”

Section: Introductionmentioning

confidence: 92%

Molecular mapping of soybean rust resistance in soybean accession PI 561356 and SNP haplotype analysis of the Rpp1 region in diverse germplasm

Kim

Unfried²,

Hyten

et al. 2012

Theor Appl Genet

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Soybean rust (SBR), caused by Phakopsora pachyrhizi Sydow, is one of the most economically important and destructive diseases of soybean [Glycine max (L.) Merr.] and the discovery of novel SBR resistance genes is needed because of virulence diversity in the pathogen. The objectives of this research were to map SBR resistance in plant introduction (PI) 561356 and to identify single nucleotide polymorphism (SNP) haplotypes within the region on soybean chromosome 18 where the SBR resistance gene Rpp1 maps. One-hundred F 2:3 lines derived from a cross between PI 561356 and the susceptible experimental line LD02-4485 were genotyped with genetic markers and phenotyped for resistance to P. pachyrhizi isolate ZM01-1. The segregation ratio of reddish brown versus tan lesion type in the population supported that resistance was controlled by a single dominant gene. The gene was mapped to a 1-cM region on soybean chromosome 18 corresponding to the same interval as Rpp1. A haplotype analysis of diverse germplasm across a 213-kb interval that included Rpp1 revealed 21 distinct haplotypes of which 4 were present among 5 SBR resistance sources that have a resistance gene in the Rpp1 region. Four major North American soybean ancestors belong to the same SNP haplotype as PI 561356 and seven belong to the same haplotype as PI 594538A, the Rpp1-b source. There were no North American soybean ancestors belonging to the SNP haplotypes found in PI 200492, the source of Rpp1, or PI 587886 and PI 587880A, additional sources with SBR resistance mapping to the Rpp1 region.

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“…하지만 association mapping은 육종에서의 높은 유용성을 가지고 있음에도 불구하고 일반 연관지도(linkage mapping)에 비해 빈도가 낮은 대립유전자 에서는 활용 가치가 낮은 편이다 (Visscher, 2008 (Gore et al, 2009;Yan et al, 2009 . 염색체의 물리적 거리와 더불어 유전적 부동, 자연 선택, 인공선택, 교배시스템, 다른 집단과의 혼합 등으로 인 하여 LD의 변형(breakdown)에 영향을 준다 (Flint-Garcia, 2003;Yu & Buckler, 2006).…”

Section: Downy Mildew 저항성 육종unclassified

Genetic Improvement of Maize by Marker-Assisted Breeding

Kim¹,

Moon²,

Baek³

et al. 2014

Korean Journal of Crop Science

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Maize is one of the most important food and feed crops in the world including Southeast Asia. In spite of numberous efforts with conventional breeding, the maize productions remain low and the loss of yields by drought and downy mildew are still severe in Asia. Genetic improvement of maize has been performed with molecular marker and genetic engineering. Because maize is one of the most widely studied crop for its own genome and has tremendous diversity and variant, maize is considered as a forefront crop in development and estimation of molecular markers for agricultural useful trait in genetics and breeding. Using QTL (Quantitative Trait Loci) and MAS (Marker Assisted Breeding), molecular breeders are able to accelerate the development of drought tolerance or downy mildew resistance maize genotype. The present paper overviews QTL/MAS approaches towards improvement of maize production against drought and downy mildew. We also discuss here the trends and importance of molecular marker and mapping population in maize breeding.

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A First-Generation Haplotype Map of Maize

Cited by 716 publications

References 23 publications

Bringing New Plant Varieties to Market: Plant Breeding and Selection Practices Advance Beneficial Characteristics while Minimizing Unintended Changes

Bringing New Plant Varieties to Market: Plant Breeding and Selection Practices Advance Beneficial Characteristics while Minimizing Unintended Changes

Molecular mapping of soybean rust resistance in soybean accession PI 561356 and SNP haplotype analysis of the Rpp1 region in diverse germplasm

Genetic Improvement of Maize by Marker-Assisted Breeding

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