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- Hu, Xian-Ge, et al.
(författare)
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De Novo Transcriptome Assembly and Characterization for the Widespread and Stress-Tolerant Conifer Platycladus orientalis
- 2016
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Ingår i: PLOS ONE. - : Public Library of Science (PLoS). - 1932-6203. ; 11:2
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Tidskriftsartikel (refereegranskat)abstract
- Platycladus orientalis, of the family Cupressaceae, is a widespread conifer throughout China and is extensively used for ecological reforestation, horticulture, and in medicine. Transcriptome assemblies are required for this ecologically important conifer for understanding genes underpinning adaptation and complex traits for breeding programs. To enrich the species' genomic resources, a de novo transcriptome sequencing was performed using Illumina paired-end sequencing. In total, 104,073,506 high quality sequence reads (approximately 10.3 Gbp) were obtained, which were assembled into 228,948 transcripts and 148,867 unigenes that were longer than 200 nt. Quality assessment using CEGMA showed that the transcriptomes obtained were mostly complete for highly conserved core eukaryotic genes. Based on similarity searches with known proteins, 62,938 (42.28% of all unigenes), 42,158 (28.32%), and 23,179 (15.57%) had homologs in the Nr, GO, and KOG databases, 25,625 (17.21%) unigenes were mapped to 322 pathways by BLASTX comparison against the KEGG database and 1,941 unigenes involved in environmental signaling and stress response were identified. We also identified 43 putative terpene synthase (TPS) functional genes loci and compared them with TPSs from other species. Additionally, 5,296 simple sequence repeats (SSRs) were identified in 4,715 unigenes, which were assigned to 142 motif types. This is the first report of a complete transcriptome analysis of P. orientalis. These resources provide a foundation for further studies of adaptation mechanisms and molecular-based breeding programs.
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- Hu, Xian-Ge, et al.
(författare)
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Global transcriptome analysis of Sabina chinensis (Cupressaceae), a valuable reforestation conifer
- 2016
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Ingår i: Molecular breeding. - : Springer Science and Business Media LLC. - 1380-3743 .- 1572-9788. ; 36:7
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Tidskriftsartikel (refereegranskat)abstract
- Sabina chinensis has broad distribution in China and is widely used in the reforestation and as an urban tree. The species is frost resistant and grows well on contaminated soils and is becoming valuable for soil remediation and protection against air pollution. Breeding programs aimed at exploiting the species' unique properties were handicapped by the lack of basic genetic information. Here, we established a transcriptomic profiling study from five different tissues using RNA-Seq to gain insight on the functional genes and the development of molecular markers for breeding and conservation purposes. In total 90,382,108 high-quality sequence reads (similar to 9.0 bp) were obtained, and 116,814 unigenes (>= 200 nt) were assembled. Of which, 45,026 and 15,589 unigenes were mapped to the Nr and KOG databases, 31,288 (26.78 %) and 17,596 (15.06 %) were annotated to GO and KEGG database, respectively. Additionally, 28,843 (24.68 %) and 43,033 (36.84 %) S. chinensis unigenes were aligned to the Pinus taeda draft genome and PLAZA2.5 database, respectively. A total of 4570 simple sequence repeat (SSR) motifs were identified in the unigenes. Furthermore, we obtained 6 (12.5 %) polymorphic and 21 (43.75 %) monomorphic loci in the verification of 48 randomly selected SSR loci. This study represents the first transcriptome data of S. chinensis and confirms that the transcriptome assembly data of S. chinensis are a useful resource for EST-SSR loci development. The substantial number of transcripts obtained will aid our understanding of the species adaptation mechanisms and provide valuable genomic information for conservation and breeding applications.
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- Jin, Yuqing, et al.
(författare)
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Genetic evaluation of the breeding population of a valuable reforestation conifer Platycladus orientalis (Cupressaceae)
- 2016
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Ingår i: Scientific Reports. - : Nature Publishing Group. - 2045-2322. ; 6
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Tidskriftsartikel (refereegranskat)abstract
- Platycladus orientalis, a widespread conifer with long lifespan and significant adaptability. It is much used in reforestation in north China and commonly planted in central Asia. With the increasing demand for plantation forest in central to north China, breeding programs are progressively established for this species. Efficient use of breeding resources requires good understanding of the genetic value of the founder breeding materials. This study investigated the distribution of genetic variation in 192 elite trees collected for the breeding program for the central range of the species. We developed first set of 27 polymorphic EST-derived SSR loci for the species from transcriptome/genome data. After examination of amplification quality, 10 loci were used to evaluate the genetic variation in the breeding population. We found moderate genetic diversity (average H-e = 0.348) and low population differentiation (Fst = 0.011). Extensive admixture and no significant geographic population structure characterized this set of collections. Our analyses of the diversity and population structure are important steps toward a long-term sustainable deployment of the species and provide valuable genetic information for conservation and breeding applications.
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