Page Banner

United States Department of Agriculture

Agricultural Research Service

Research Project: Expansion of Oat Expressed Tagged Sequence (EST) Information and Development of Oat Single Nucleotide Polymorphism (SNP) Marker

Location: Small Grains and Potato Germplasm Research

Project Number: 5366-21000-031-01
Project Type: Trust

Start Date: Feb 01, 2009
End Date: Dec 31, 2013

Objective:
The objectives of this work are to: i) sequence hundreds of thousands of expressed-tagged (EST) sequences from 20 diverse genotypes representing the N. American oat germplasm, ii) sequence the remaining DArT clones from previous work, iii) develop approximately 1,536 to 3,072 oat-based SNP markers from the aforementioned sequences, iv) develop a high-throughput SNP array (Illumina®) for use in genetic studies and MAB oat key oat traits, v) identify sequences for genes controlling soluble and insoluble oat fiber, and vi) validate the function of each fiber gene discovered.

Approach:
cDNA libraries from 20 oat genotypes representing the genetic variation within N. American germplasm will be constructed (N = 64). The libraries will be sequenced using 454 GS FLX sequencing and the resulting information will be used to construct contigs which will be aligned to identify in silico SNPs. In addition, redundant DArT clones will be sequenced and alignments will be used to identify addition silico SNPs. From these sequences, the best 1536 in silico SNPs will be sent to Illumina® for development of a pilot Oat Oligo Pool Assay (OOPA) panel via the Illiumina® Assay Design Tool. Pilot OOPA SNPs will be validated across 109 N. American cultivars and breeding lines, six mapping populations, and 32 aneuploid-hybrid stocks. To achieve the goal of at least 1,536 to 3,072 SNP markers for oat, a second pilot OOPA panel will be developed and validated as previously described. In addition to this work, additional cDNA libraries from developing seeds will be constructed and sequenced. This infromation will be used to identify genes controlling soluble and insoluble fiber in oat. Once the transcripts from these genes are dissovered full length sequences will be obtained using comparative genomics. The sequences function will be validated by transformation of Arabidopsis and/or soybean. Further validation of the genes will be done using a tilling approach.

Last Modified: 4/17/2014
Footer Content Back to Top of Page