Abstract
Background
Ganoderma boninense is a phytopathogen of oil palm, causing basal and upper stem rot diseases.
Methods
The genome sequence was used as a reference to study gene expression during growth in a starved carbon (C) and nitrogen (N) environment with minimal sugar and sawdust as initial energy sources. This study was conducted to mimic possible limitations of the C–N nutrient sources during the growth of G. boninense in oil palm plantations.
Results
Genome sequencing of an isolate collected from a palm tree in West Malaysia generated an assembly of 67.12 Mb encoding 19,851 predicted genes. Transcriptomic analysis from a time course experiment during growth in this starvation media identified differentially expressed genes (DEGs) that were found to be associated with 29 metabolic pathways. During the active growth phase, 26 DEGs were related to four pathways, including secondary metabolite biosynthesis, carbohydrate metabolism, glycan metabolism and mycotoxin biosynthesis. G. boninense genes involved in the carbohydrate metabolism pathway that contribute to the degradation of plant cell walls were up-regulated. Interestingly, several genes associated with the mycotoxin biosynthesis pathway were identified as playing a possible role in pathogen-host interaction. In addition, metabolomics analysis revealed six metabolites, maltose, xylobiose, glucooligosaccharide, glycylproline, dimethylfumaric acid and arabitol that were up-regulated on Day2 of the time course experiment.
Conclusions
This study provides information on genes expressed by G. boninense in metabolic pathways that may play a role in the initial infection of the host.





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Data availability
Genome sequences are available in GenBank under the BioProject PRJNA912356 (Link to data: https://dataview.ncbi.nlm.nih.gov/object/PRJNA912356?reviewer=m1q88r1gkqlllct4ilhatr9fo3). PER71 RNAseq data used as evidence in the pipelines were: (i) 27 libraries from the C–N starvation study; (ii) Iso-seq 1-3 kb; (iii) PER71 grown on PDA; (iv) PER71 grown on rubber woodblock for 47 days (PER71-47).
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Acknowledgements
The authors would like to thank the Director General of the Malaysian Palm Oil Board (MPOB) for permission to publish this article. Our appreciation is extended to Christina Cuomo at the Broad Institute of MIT and Harvard, USA for her role in providing advice and assistance with early data analysis. We acknowledge the invaluable contributions of Mariah Zainal Abidin (Energy and Environment Unit, E&P Research Division, MPOB). Special thanks to the late Dr. Richard Cooper for his advice in the initial experimental design of this study. We also express our gratitude to the members of the Breeding and Tissue Culture Unit, ABBC, MPOB, for the usage of their laboratory and technical support. Special thanks to Nik Shazana Nik Mohd Sanusi for her technical support in software configuration. We are grateful to Meilina Ong-Abdullah and Rajinder Singh for their role in providing advice on funding acquisition. This research was funded by the Malaysian Palm Oil Board.
Funding
This work was supported by The Malaysian Palm Oil Board.
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JN: Conception and design of study, investigation, analysis and interpretation of data, drafting the manuscript, revising the manuscript critically, approval of the version of the manuscript to be published. SEO: Revising the manuscript critically, approval of the version of the manuscript to be published. KLC: Data curation, software. FK: Investigation. ZN: Analysis and interpretation of data, drafting the manuscript. MAAH: Visualization. LPLA: Drafting the manuscript. SS: Resource of study material. CFC: Conception and design of study. STM: Conception and design of study. ETLL: Conception and design of study, supervision, revising the manuscript critically, approval of the version of the manuscript to be published.
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Nagappan, J., Ooi, SE., Chan, KL. et al. Transcriptional effects of carbon and nitrogen starvation on Ganoderma boninense, an oil palm phytopathogen. Mol Biol Rep 51, 212 (2024). https://doi.org/10.1007/s11033-023-09054-4
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DOI: https://doi.org/10.1007/s11033-023-09054-4

