Abstract
Key message
We deeply investigated the mechanism underlying metabolic regulation in response to consecutive monoculture (replanting disease) and different abiotic stresses that unfolded the response mechanism to consecutive monoculture problem through RNA-seq analysis.
Abstract
The consecutive monoculture problem (CMP) resulted of complex environmental stresses mediated by multiple factors. Previous studies have noted that multiple stress factors in consecutive monoculture soils or plants severely limited the interpretation of the critical molecular mechanism, and made a predict that the specifically responding factor was autotoxic allelochemicals. To identify the specifically responding genes, we compared transcriptome changes in roots of Rehamannia glutinosa Libosch using consecutive monoculture, salt, drought, and ferulic acid as stress factors. Comparing with normal growth, 2502, 2672, 2485, and 1956 genes were differentially expressed in R. glutinosa under consecutive monoculture practice, salt, drought, and ferulic acid stress, respectively. In addition, 510 genes were specifically expressed under consecutive monoculture, which were not present under the other stress conditions. Integrating the biological and enrichment analyses of the differentially expressed genes, the result demonstrated that the plants could alter enzyme genes expression to reconstruct the complicated metabolic pathways, which used to tolerate the CMP and abiotic stresses. Furthermore, most of the affected pathway genes were closely related to secondary metabolic processes, and the influence of consecutive monoculture practice on the transcriptome genes expression profile was very similar to the profile under salt stress and then to the profile under drought stress. The outlined schematic diagram unfolded the putative signal regulation mechanism in response to the CMP. Genes that differentially up- or down-regulated under consecutive monoculture practice may play important roles in the CMP or replanting disease in R. glutinosa.
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Abbreviations
- DEG:
-
Differentially expressed gene
- CMP:
-
Consecutive monoculture problem
- FP:
-
First year planting
- SP:
-
Second year planting
- SAP:
-
NaCl stress-treated plants
- DP:
-
Drought stress-treated plants
- FAP:
-
Ferulic acid treated plants
- vs:
-
Versus
- GO:
-
Gene ontology
- CYP:
-
Cytochrome P450
- UGT:
-
Uridine diphosphate glycosyl transferases
- RPKM:
-
Per million mapped sequence reads
- FDR:
-
False discovery rate
- QCl:
-
Quality control
- KEGG:
-
Kyoto encyclopedia of genes and genomes
- SEA:
-
Singular enrichment analysis
- EC:
-
Enzyme Commission
- MVA:
-
Mevalonate
- MEP:
-
Methylerythritol phosphate
- HMGR:
-
Hydroxymethylglutaryl-CoA reductase
- GPPS:
-
Geranyldiphosphate synthase
- FPPS:
-
Farnesyldiphosphate synthase
- GGPPS:
-
Geranylgeranyldiphosphate synthase
- SQS:
-
Squalene synthase
- SE:
-
Squalene monooxygenase
- CAS:
-
Cycloartenol synthase
- SMT2:
-
24-Methylene sterol C-methyl transferase
- DWF5:
-
7-Dehydrocholesterol reductase
- DWF1:
-
Delta24-sterol reductase
- AACT:
-
Acetyl-CoA C-acetyl transferase
- FK:
-
Delta 14-sterol reductase
- BRs:
-
Sitosteroland brassinosteroids
- CYP716A52V2:
-
B-Amyrin 28-oxidase
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Acknowledgements
This work was supported by grants from the National Natural Science Foundation of China (Nos. 81274022, 81573538, 81503193, 81403042, and 31271674), the Key Scientific Research Project of the higher Education Institutions of Fujian Province of China (No. JK2015013), and Fujian-Taiwan Joint Innovative Center for Germplasm Resources and cultivation of crop (FJ 2011 Program, No. 2015-75, China).
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Communicated by Chun-Hai Dong.
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Tian, Y., Feng, F., Zhang, B. et al. Transcriptome analysis reveals metabolic alteration due to consecutive monoculture and abiotic stress stimuli in Rehamannia glutinosa Libosch. Plant Cell Rep 36, 859–875 (2017). https://doi.org/10.1007/s00299-017-2115-2
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DOI: https://doi.org/10.1007/s00299-017-2115-2