Abstract
Aims
Oilseed rape (Brassica napus L.) has high nitrogen (N) requirement for its optimal growth and yield. However, little is known about the transcriptomic reprogramming of rapeseed in response to N deficiency.
Methods
Two rapeseed genotypes with contrasting N use efficiency (NUE) were used to perform whole-transcriptome sequencing on the shoots and roots supplied with or without N in a time-course experiment.
Results
A total of 24,435 differentially expressed genes (DEGs) were identified. Among them, 8811 genes were differentially expressed between two N treatments and between the two genotypes. Coexpression networks reveal central N-deficiency-response modules with diverse expression patterns between the two genotypes. Major expression hubs involved in phytohormone signaling were identified and showed strong association with DEGs in each module. Genes involved in N uptake and assimilation, carbohydrate catabolism, amino acid metabolism, and fatty acid biosynthesis were enriched between the two genotypes under N deprivation. In addition, photosynthesis and carbon assimilation declined under prolonged N stress, but starch biosynthesis was enhanced by N deprivation.
Conclusions
Our results revealed N-responsive genes and gene networks and expanded the knowledge of regulatory hubs in N-deprived rapeseed. The detailed gene information might assist the genetic improvement of NUE in B. napus.
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Acknowledgments
This work was supported by the Grants from the National Key Research and Development Program of China (2018YFD0200900) and the Fundamental Research Funds for the Central Universities of China (2662019PY013). We thank Professor Jianwei Lu (Huazhong Agricultural University, China) for his critical advice in experimental design.
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ESM 1
Number of differentially expressed genes (DEGs) between D4–15 and D2–1 across the four time points after nitrogen (N) starvation. A, Number of DEGs in root after N starvation. B, Number of DEGs in shoot after N starvation. DEGs specifically modulated in D2–1 and D4–15 are shown in red and blue color, respectively. Grey color indicates the shared DEGs in both genotypes. X-axis indicates the time after N starvation. DEGs were identified using DESeq2 with the threshold: adjusted P value <0.05 and |log2 (fold change)| > 1. (DOCX 2303 kb)
ESM 2
Comparison between the log2 fold change of relative expression obtained from RNA-Seq data (X-axis) and qRT-PCR (Y-axis) under N-starvation (0 mM N) condition compared to control (6 mM N) condition. (DOCX 136 kb)
ESM 3
Hierarchical cluster trees and co-expression modules identified by WGCNA in roots (A) and shoots (B) of the two Brassica napus genotypes based on the DEGs. Each branch in the dendrogram constitutes a module and each leaf in the branch represents one gene. Different modules were labeled with different colors in order to be distinguished from each other and the grey part contains genes not belonging to any modules. (DOCX 384 kb)
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Yang, N., Li, S., Wang, S. et al. Dynamic transcriptome analysis indicates extensive and discrepant transcriptomic reprogramming of two rapeseed genotypes with contrasting NUE in response to nitrogen deficiency. Plant Soil 456, 369–390 (2020). https://doi.org/10.1007/s11104-020-04720-z
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DOI: https://doi.org/10.1007/s11104-020-04720-z