Abstract
All plant shoot tips contain apical meristems, an area that differentiates into multiple cell and tissue types and is critical to the development of the above ground plant body. To study the development of birch (Betula platyphylla Suk.), we constructed a transcriptome from the young shoot tips of birch by using the Solexa method. In total, 40,780 tentative unique genes (TUGs) were generated. Among these, 29,939 genes showed significant (>1E5) sequence similarity with proteins in the NR-database. Gene ontology (GO) classification suggested that 6,945 TUGs were categorized as involved in biological processes, 10,639 TUGs were grouped into encoding cellular components, and 6,159 TUGs were assigned to roles involving molecular function group. Our results showed that the GO subgroup of genes involved in binding and those involved in metabolic processes are most abundant in terms of molecular functions and biological processes, respectively. Furthermore, the most abundant genes in the transcriptome are β-N-acetylhexosaminidase, ribosomal protein L44, thioredoxin H, light-harvesting complex I protein, S-adenosylmethionine decarboxylase, NADP-dependent glyceraldehyde-3-phosphate dehydrogenase, and tonoplast proton pump. The expression profiles of some abundant genes were studied during a 1-year growth period using real-time RT-PCR. The results showed that their expression altered significantly during the growth stages, suggesting that they play active roles in shoot development.
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Abbreviations
- AS:
-
Asparagine synthetase
- β-NAHA:
-
β-N-acetylhexosaminidase
- CAB:
-
Chlorophyll a/b-binding proteins
- GAPDH:
-
Glyceraldehyde-3-phosphate dehydrogenase
- GO:
-
Gene ontology
- PRPs:
-
Proline-rich proteins
- RPKM:
-
Reads per kb per million reads
- SAMDC:
-
S-adenosylmethionine decarboxylase
- SuSy:
-
Sucrose synthase
- TUGs:
-
Tentative unique genes
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Acknowledgments
This work was supported by grants from Special Research Funds for Public Welfare Forestry (No. 200904039), Fundamental Research Funds for the Central Universities (DL09DA01), Specialized Research Fund for the Doctoral Program of Higher Education (20100062120001), and the National Natural Science Foundation of China (30972385).
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Communicated by J. Wegrzyn
Yucheng Wang and Caiqiu Gao have the same contribution to this paper.
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Wang, Y., Gao, C., Zheng, L. et al. Building an mRNA transcriptome from the shoots of Betula platyphylla by using Solexa technology. Tree Genetics & Genomes 8, 1031–1040 (2012). https://doi.org/10.1007/s11295-012-0483-x
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DOI: https://doi.org/10.1007/s11295-012-0483-x