Transcriptomic and proteomic comparison of two Miscanthus genotypes: high biomass correlates with investment in primary carbon assimilation and decreased secondary metabolism
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Background and aims
The plant genus Miscanthus combines high biomass production in temperate climates with low nutrient input requirements. Among the widely studied genotypes, the triploid hybrid Miscanthus x giganteus has attracted most interest because of its outstanding yields. Here, M. x giganteus was compared to its parent M. sinensis to identify traits associated with high biomass.
Comparative investigation of the element content, photosynthesis, transcriptomes and proteomes.
Photosynthesis-related and Calvin cycle enzymes are among the key traits differing between the two species. Major transcriptional differences pinpoint to a reduced investment into the secondary metabolism in M. x giganteus during rapid growth. A higher nitrogen, potassium and zinc concentration was found in the leaves of M. x giganteus. In the shotgun sequences of the leaf transcriptome, bacterial 16S sequences were identified. These were dominated by α–, γ–, δ–proteobacteria, despite Herbaspirillum and Clostridium species had been previously isolated from Miscanthus.
Miscanthus species thus differ in several key traits, which may help to guide future phenotyping efforts to select for high yielding varieties for sustainable biomass production. Having established these techniques in Miscanthus, the next step is to apply them in breeders’ germplasm.
KeywordsBiomass Bioenergy Sustainability Microbial metagenome Proteomics Transcriptomics Element content
We thank Prof. Ralf Kaldenhoff (Technical University of Darmstadt, Germany) for generous support of lab space and the Life Science Center of the University of Hohenheim (Dr. Pfannstiel) for peptide analysis.
DS carried out transcriptome work and analysis, YL, HY and DS performed the proteome work and UL conceived the study. DS and UL wrote the manuscript. All authors read and approved the final manuscript.
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