title: Camelina seed transcriptome: a tool for meal and oil improvement and translational research.
abstract: Camelina (Camelina sativa), a Brassicaceae oilseed, has received recent interest as a biofuel crop and production platform for industrial oils. Limiting wider production of camelina for these uses is the need to improve the quality and content of the seed protein-rich meal and oil, which is enriched in oxidatively unstable polyunsaturated fatty acids that are deleterious for biodiesel. To identify candidate genes for meal and oil quality improvement, a transcriptome reference was built from 2047 Sanger ESTs and more than 2 million 454-derived sequence reads, representing genes expressed in developing camelina seeds. The transcriptome of approximately 60K transcripts from 22 597 putative genes includes camelina homologues of nearly all known seed-expressed genes, suggesting a high level of completeness and usefulness of the reference. These sequences included candidates for 12S (cruciferins) and 2S (napins) seed storage proteins (SSPs) and nearly all known lipid genes, which have been compiled into an accessible database. To demonstrate the utility of the transcriptome for seed quality modification, seed-specific RNAi lines deficient in napins were generated by targeting 2S SSP genes, and high oleic acid oil lines were obtained by targeting FATTY ACID DESATURASE 2 (FAD2) and FATTY ACID ELONGASE 1 (FAE1). The high sequence identity between Arabidopsis thaliana and camelina genes was also exploited to engineer high oleic lines by RNAi with Arabidopsis FAD2 and FAE1 sequences. It is expected that these transcriptomic data will be useful for breeding and engineering of additional camelina seed traits and for translating findings from the model Arabidopsis to an oilseed crop.
authors.affiliation: Center for Plant Science Innovation and Department of Biochemistry, University of Nebraska-Lincoln, Lincoln, NE, USA.
authors.forename: Huu T
authors.initials: HT
authors.lastname: Nguyen
authors.forename: Jillian E
authors.initials: JE
authors.lastname: Silva
authors.forename: Ram
authors.initials: R
authors.lastname: Podicheti
authors.forename: Jason
authors.initials: J
authors.lastname: Macrander
authors.forename: Wenyu
authors.initials: W
authors.lastname: Yang
authors.forename: Tara J
authors.initials: TJ
authors.lastname: Nazarenus
authors.forename: Jeong-Won
authors.initials: JW
authors.lastname: Nam
authors.forename: Jan G
authors.initials: JG
authors.lastname: Jaworski
authors.forename: Chaofu
authors.initials: C
authors.lastname: Lu
authors.forename: Brian E
authors.initials: BE
authors.lastname: Scheffler
authors.forename: Keithanne
authors.initials: K
authors.lastname: Mockaitis
authors.forename: Edgar B
authors.initials: EB
authors.lastname: Cahoon
mesh_terms: D000214:Acyl Coenzyme A / Q000378:metabolism; D017360:Arabidopsis / Q000235:genetics; D001483:Base Sequence; D019607:Brassicaceae / Q000235:genetics*; D005227:Fatty Acids / Q000096:biosynthesis; D018506:Gene Expression Regulation, Plant; D017343:Genes, Plant / Q000235:genetics; D008969:Molecular Sequence Data; D010802:Phylogeny; D010938:Plant Oils / Q000378:metabolism*; D020641:Polymorphism, Single Nucleotide / Q000235:genetics; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D055314:Seed Storage Proteins / Q000235:genetics / Q000378:metabolism*; D012639:Seeds / Q000235:genetics* / Q000254:growth & development; D059467:Transcriptome / Q000235:genetics*; D057170:Translational Research, Biomedical
chemical_list: D000214:Acyl Coenzyme A; D005227:Fatty Acids; D010938:Plant Oils; D012333:RNA, Messenger; D055314:Seed Storage Proteins
keywords: camelina; fatty acid; meal; oleic acid; seed; transcriptome; vegetable oil