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Identification and functional study of oleoresin terpenoid biosynthesis-related genes in masson pine (Pinus massoniana L.) based on transcriptome analysis

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Abstract

Masson pine (Pinus massoniana L.) is one of the most important species for oleoresin production worldwide. However, the mechanism of oleoresin synthesis in masson pine remains poorly studied. We revealed the key differentially expressed genes associated with terpenoid biosynthesis in trees with different yields of oleoresin in different tissues (trunk xylem and needle) during different seasons (spring and autumn) based on the combined application of the SMRT full-length transcriptome and Illumina RNA sequencing under field operations. A total of 76,754 full-length non-redundant transcripts were obtained in the study. Transcriptome data were annotated with KEGG and GO, and they have been shown to be of high quality by qRT-PCR. Chloroplastic 2-C-methyl-D-erythritol 4-phosphate (MEP) pathway and cytosolic mevalonate (MVA) pathway genes have different preferences under different conditions. Moreover, the phylogenetic analysis results revealed three classes of DXS genes with different functions. Among the tissue-specific genes, AACT1 was expressed in the trunk xylem at the highest levels, while MCS (1, 4) and HDR2 were significantly upregulated in the needle. Among stage-specific genes, DXS6 and HDS6 were expressed in the trunk xylem in August (autumn) at the highest levels. Furthermore, all of the terpene synthase (TPS) differentially expressed genes (DEGs) were clustered into the gymnosperm-specific TPS-d subfamily, including sesquiterpene synthase and diterpene synthase genes. According to the protein sequence alignment, diTPS1 and diTPS5 with three conserved active sites catalysed the synthesis of diterpene resin acids. In the low-yield oleoresin clone, diTPS (1, 5) and GGPPS (4, 6) were upregulated in the trunk xylem. The integration of the transcriptomic data indicated that the AACT, MCS, HDR, DXS, HDS, and TPS (with two conserved active sites) may play critical roles in the terpenoids biosynthesis of masson pine. The results of our study can be useful for developing an understanding of the coniferous genome and to significantly accelerate confer breeding.

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Abbreviations

MEP pathway:

2-C-methyl-D-erythritol 4-phosphate pathway

DXS:

1-deoxy-d-xylulose-5-phosphate synthase

DXR:

1-deoxy-d-xylulose-5-phosphate reductoisomerase

MCT:

2-C-methyl-D-erythritol 4-phosphate cytidylyltransferase

CMK:

4-diphosphocytidyl-2-C-methyl-D-erythritol kinase

MCS:

2-C-methyl-D-erythritol 2, 4-cyclodiphosphate synthase

HDS:

2-C-methyl-D-erythritol 2, 4-cyclodiphosphate synthase

HDR:

2-C-methyl-D-erythritol 2, 4-cyclodiphosphate reductase

MVA pathway:

cytosolic mevalonate pathway

AACT:

acetyl-CoA acetyltransferase

HMGS:

hydroxy methylglutaryl-CoA synthase

HMGR:

hydroxy methylglutaryl-CoA reductase

MK:

mevalonate kinase

PMK:

phosphomevalonate kinase

MDD:

diphosphomevalonate decarboxylase

IDI:

isopentenyl-diphosphate delta-isomerase

IPP:

isopentenyl diphosphate

DMAPP:

dimethylallyl diphosphate

GPPS:

geranyl diphosphate synthase

FPPS:

farnesyl pyrophosphate synthase

GGPPS:

geranylgeranyl diphosphate synthase

P450:

cytochrome P450

TPS:

terpenoid synthase

diTPS:

diterpene synthase

Nr:

NCBI non-redundant protein sequences

COG:

Clusters of Orthologous Groups

KOG:

EuKaryotic Ortholog Groups

eggNOG:

evolutionary genealogy of genes: non-supervised orthologous groups of proteins

KEGG:

Kyoto Encyclopedia of Genes and Genomes

Swiss-Prot:

a manually annotated and reviewed protein sequence database

Pfam:

protein family

GO:

gene ontology

SSR:

simple sequence repeats

CDS:

coding region sequence

qRT-PCR:

quantitative real-time PCR

ROI:

reads of insert

CCS:

circular consensus sequences

FLNC:

full-length of non-chimeric

DEGs:

differentially expressed genes

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Funding

This research was funded by the National Key Research and Development Plan (grant number 2017YFD060030304); the Innovation Talent Program of Guizhou Province, People’s Republic of China (grant number 2016-4010); and the Postgraduate Research Project of Guizhou Province (grant number Qian JiaoHe Postgraduate Research Project Zi YJSCXJH [2018]048]).

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Correspondence to Xiaopeng Wen.

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The authors declare that they have no conflict of interest.

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The research conducted was in compliance with the laws of the country in which the research was conducted.

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Communicated by F.P. Guerra

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Mei, L., Li, Z., Yan, Y. et al. Identification and functional study of oleoresin terpenoid biosynthesis-related genes in masson pine (Pinus massoniana L.) based on transcriptome analysis. Tree Genetics & Genomes 16, 53 (2020). https://doi.org/10.1007/s11295-020-01448-w

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  • DOI: https://doi.org/10.1007/s11295-020-01448-w

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