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“CSI” Plant Style: From the Laboratory to the Wheat Field CAP Grant Discover new, valuable, genes and QTLs Deploy them into adapted varieties around the country Use marker-assisted selection strategies to enhance gene deployment CAP Grant 16 institutions around the country coordinate breeding efforts 4 year grant started in 2006 Over 20 cultivars/germplasm already released (http://maswheat.ucdavis.edu) Impact of Wheat in Washington In 2006 Excess of 2.2 million acres planted 81% winter wheat, 19% spring wheat Over 140 million bushels harvested Net return of $615 million From Problem to Lab to Wheat Field What Traditional Problems Do We Face New Characteristics Needed Drought tolerance Disease and Insect resistance/tolerance Herbicide resistance/tolerance High yield Excellent end-use quality (High GPC) Definitions DNA—Deoxyribo nucleic acid that carries the genetic information in a cell Gene—a sequence of DNA that occupies a specific location and determines a particular characteristic Definitions Allele-one member of a pair of genes that occupies a specific location on DNA A= a= = homozygous dominant = homozygous recessive = heterozygous Punett Square Crossing Plants are identified which have the trait and which need the trait Cross is made to introgress trait Survivor, no game X Rock-star yielder, dies 10 Seeds (all ) Self pollination 25 ( ) 50 ( ) 25 ( ) Crossing Cross is made to introgress trait Survivor, no game X Rock-star yielder, dies 10 Seeds (all ) Self pollination 25 ( ) 50 ( Survivor, Rock-star yielder? ) 25 ( ) How Do We Determine Which Seeds Carry The Trait We Are Interested In? So, which of you plants are resistant to fungal diseases? I am! I am! I am! I am! I am! I am! Definitions Molecular Markers—DNA segments that can be used as flags to track genes Linkage—occurs when particular genes are inherited jointly Linked Markers—markers which are closely associated with a gene DNA Gene Marker Gene We know the DNA sequence of the marker Sometimes we do not know the sequence of the gene we are looking for We can use the marker to indirectly select for the gene of interest Tightly Linked Marker Gene Marker Gene 95% confident Non-linked Marker Gene Marker Gene 50% confident Marker-Assisted Selection Identify marker which is linked to gene We can extract DNA from the plants and look for the presence of the marker This will tell us which have the trait and which do not Picture of harvesting tissue 1 2 3 4 + 95% Ethanol PCR Explanation Polymerase Chain Reaction Used to amplify DNA via enzymatic replication Allows a small amount of DNA to be used for analysis PCR reaction http://www.danquinnart.com/wheatcap/index.htm Gel Electrophoresis Allows separation of PCR product DNA inserted into agarose gel DNA fragments travel with current Smaller fragments will travel faster than large fragments Gel Analysis Gel Analysis Gel Analysis Gel Analysis Gel Analysis So, which of you plants are resistant to fungal diseases? Evaluation After MAS has identified which plants carry the trait, further evaluation is done in the field to make sure the plants are productive Time to release a variety is shortened Why would this be important? Zak + 1 gene Tara 2002 Trait Selection Crossing From Laboratory to Wheat Field Washington Farmers Shepherds Grain WSU Food Services Acknowledgements