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The complete chloroplast genome of Rhododendron delavayi (Ericaceae).

ABSTRACT: Rhododendron delavayi, as a member of Ericaceae family, has been widely used as an important garden flower. The cp genome of R. delavayi exhibited a typical quadripartite cycle with 193,798 bp, comprising of a pair of inverted repeats (IRa and IRb) of 15,494 bp intersected by a large single copy (LSC) region of 160,234 bp and a quite small single copy region of 2576 bp. Totally, 123 unique genes were assembled in this cp genome, including 80 protein genes, 35 tRNAs and 8 rRNAs. Out of these assembled genes, 88 genes (71.54%) were single copy. Phylogenetic analysis based on 14 cp genome of related species showed that the R. delavayi was closely related to Vaccinium oldhamii. This study provides important information for future evolution, genetic and molecular biology studies of Rhododendron.

SUBMITTER: Liu J

PROVIDER: S-EPMC7721020 | biostudies-literature |

REPOSITORIES: biostudies-literature

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Project description:Rhododendron delavayi Franch. is globally famous as an ornamental plant. Its distribution in southwest China covers several different habitats and environments. However, not much research had been conducted on Rhododendron spp. at the molecular level, which hinders understanding of its evolution, speciation, and synthesis of secondary metabolites, as well as its wide adaptability to different environments. Here, we report the genome assembly and gene annotation of R. delavayi var. delavayi (the second genome sequenced in the Ericaceae), which will facilitate the study of the family. The genome assembly will have further applications in genome-assisted cultivar breeding. The final size of the assembled R. delavayi var. delavayi genome (695.09 Mb) was close to the 697.94 Mb, estimated by k-mer analysis. A total of 336.83 gigabases (Gb) of raw Illumina HiSeq 2000 reads were generated from 9 libraries (with insert sizes ranging from 170 bp to 40 kb), achieving a raw sequencing depth of ×482.6. After quality filtering, 246.06 Gb of clean reads were obtained, giving ×352.55 coverage depth. Assembly using Platanus gave a total scaffold length of 695.09 Mb, with a contig N50 of 61.8 kb and a scaffold N50 of 637.83 kb. Gene prediction resulted in the annotation of 32 938 protein-coding genes. The genome completeness was evaluated by CEGMA and BUSCO and reached 95.97% and 92.8%, respectively. The gene annotation completeness was also evaluated by CEGMA and BUSCO and reached 97.01% and 87.4%, respectively. Genome annotation revealed that 51.77% of the R. delavayi genome is composed of transposable elements, and 37.48% of long terminal repeat elements (LTRs). The de novo assembled genome of R. delavayi var. delavayi (hereinafter referred to as R. delavayi) is the second genomic resource of the family Ericaceae and will provide a valuable resource for research on future comparative genomic studies in Rhododendron species. The availability of the R. delavayi genome sequence will hopefully provide a tool for scientists to tackle open questions regarding molecular mechanisms underlying environmental interactions in the genus Rhododendron, more accurately understand the evolutionary processes and systematics of the genus, facilitate the identification of genes encoding pharmaceutically important compounds, and accelerate molecular breeding to release elite varieties.

Dataset Information

The complete chloroplast genome of Rhododendron delavayi (Ericaceae).

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