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Gael has now moved to work at CHIBAS in Haiti (www.chibas-bioenergy.org) I'm a postdoc in the Institute for Genomic Diversity but have a close affiliation with Ed Buckler's group. My Maize meeting poster Who am I? I am a geneticist, plant breeder and plant biologist with a Ph.D. from the School of Agronomy of Montpellier, France. My working experience is in:Quantitative genetic theory and plant breeding
Statistical genetics
Familiar with the use of the ‘Henderson mixed model’ and its use in quantitative genetics and breeding
SAS programming
Evaluation of genetic resources and genetic diversity
Population genetics relevant to the characterization of population subdivision and other levels of shared ancestries (including the estimation and characterization of population structure using information from molecular markers)
Familiar with molecular genetics techniques (sequencing and genotyping) and the use of genotyping and sequencing information for the dissection of quantitative traits.
Excellent verbal and writing skills in English, French, Spanish and Creole (Haiti)
November 2003 to present – Cornell University, Institute for genomic Diversity – Post Doctoral associate and then Research Associate.
At the IGD, I am working on Maize Diversity-Based Genomics. Specifically, I am working on the dissection of the plant and inflorescence architecture in maize and the rapidly evolving ZmCLE gene family. Also, I am involved in quantitative genetics and developing association mapping methodologies. The dissection of complex traits in maize is done by utilizing both association and linkage based approaches. To conduct these analyses, we are developing linkage and association populations that capture much of the natural variation inherent in the maize gene pool. Extensive phenotypic data and surveys of candidate gene sequences are employed. This approach should allow for the rapid dissection of complex traits down to the gene level.
I am also involved in the development of a new statistical genetics methodology that adequately accounts for complex pedigrees, families, founding effects and population structure. This methodology is used in association mapping and can also be used to estimate key genetic parameters such as narrow sense heritability, genetic correlations, establishment of breeding index, breeding values by using our new mixed linear model approaches with marker based estimates of relatedness (it will prove very useful for managing a breeding program or evaluating a germplasm collection).
September 1999 to September 2003 – Joint appointment at the International Maize and Wheat Improvement Center (CIMMYT), Mexico, and at the French Research Institute for Development (IRD), Montpellier, France – The research was carried out at CIMMYT as part of my PhD Dissertation
In my thesis work, I report on the impact of traditional farmer management of maize landrace populations in the Central Valleys of Oaxaca, Mexico, in structuring diversity with special regards to quantitative trait variation. This work included the:
Evaluation of the genetic diversity of these maize landraces with special regards to the variation of quantitative traits and agronomical performance
Evaluation of the population structure and the impact of farmer’s practices and maize mating system m collection).
February 1998 to June 1999 – French National Service. Served as a research assistant in Molecular Biology with a research team from the French Research Institute for Development (IRD) based at the International Maize and Wheat Improvement Center (CIMMYT) in Mexico.
Worked in the dissection of apomixis in Tripsacum (molecular biology).
September 1996 to September 1997 – Worked at the French Research Institute for Development (IRD), Montpellier, France - – The research carried out at IRD was part of my DEA (MSc) Dissertation
Characterization of rice polygenic resistance to the rice yellow mottle virus (RYMV): I characterized a Quantitative Trait Locus (QTL) for resistance to RYMV and its epistatic interactions with other regions of the genome. Additionally, I initiated a marker assisted introgression of this QTL to an elite rice variety.
Academic degrees
PhD from the School of Agronomy of Montpellier (ENSAM) Obtained in September 2003. In collaboration with the French Research Institute for Development (IRD). Advisor: Dr. Julien Berthaud.
DEA (MSc) from the school of Agronomy of Paris (INA-PG) and Pierre-et-Marie-Curie University, Paris 6 (under the direction of Professor Dr. A Gallais) obtained in September 1997 in quantitative genetics and plant breeding theory. Dissertation advisor: Dr. Alain Ghesquière.
Maîtrise (Bachelor) in population biology. Obtained in June 1996
Fellowships and Scholarships
Research Fellowship from the International Maize and Wheat improvement Center (CIMMYT). November 2002 to February 2003
Research Fellowship from the French Secretary of Science and Education. November 1999 to October 2002
Research Fellowship from the French Research Institute for Development (IRD). November 1999 to October 2002
Received a full Scholarship from the French Secretary of Science and Education as an undergraduate student from 1993 to 1997 when I graduated from the DEA (MSc)
Work in progress and manuscript in preparation:
Pressoir G, Yu J, Flint-Garcia S, Zhang Z, Holland JB, Buckler ES and Kresovich S. Partitioning genetic variance for quantitative traits using information from molecular markers. Manuscript in preparation.
Casa A*, Pressoir G*, et al Sorghum association panel: a community-oriented resource. Manuscript in preparation. * Equally contributing to this work
Pressoir G, et al. ZmCLE1 is a gene responsible for natural variation in plant architecture and flowering time in maize. Manuscript in preparation.
Article on a seed morphology gene
Article on association with candidate genes from the NSF maize inflorescence project
Selected publications:
Yu J*, Pressoir G*, Briggs WH, Vroh Bi I, Yamasaki M, Doebley JF, McMullen MD, Gaut BS, Nielsen DM, Holland JB, Kresovich S and Buckler ES. A unified mixed-model method for association mapping that accounts for multiple levels of relatedness. Nat Genet. (2006) 38: 203-208. * Equally contributed to this work
Flint-Garcia SA, Thuillet A-C, Yu J, Pressoir G, Romero SM., Mitchell, SE, Doebley J, Kresovich S, Goodman MM and Buckler ES. Maize association population: a high-resolution platform for quantitative trait locus dissection. The Plant Journal (2005) 44: 1054-1064.
Pressoir G and Berthaud J. Effect of kernel color in structuring genetic diversity in maize landraces. (in preparation, a PDF version of my phD thesis chapter, in English, corresponding to this article can be requested)
Pressoir G and Berthaud J. Population structure and strong divergent selection shape phenotypic diversification in maize landraces. Heredity (2004) 92, 95-101.
Pressoir G and Berthaud J. Patterns of population structure in maize landraces from the Central Valleys of Oaxaca in Mexico. Heredity (2004) 92, 88-94.
Ahmadi N, Albar L, Pressoir G, Pinel A, Fargette D and Ghesquiere A. Genetic basis and mapping of the resistance to Rice yellow mottle virus. III. Analysis of QTL efficiency in introgressed progenies confirmed the hypothesis of complementary epistasis between two resistance QTLs. Theor Appl Genet (2001) 103:1084-1092.
Pressoir G, Albar L, Ahmadi N, Rimbault I, Lorieux M, Fargette D and Ghesquiere A. Genetic basis and mapping of the resistance to rice yellow mottle virus. II. Evidence of a complementary epistasis between two QTLs. Theor Appl Genet (1998) 97:1155-1161.
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