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Comparative analysis of transcriptomic profiling to identify genes involved in the bulged surface of pear fruit (Pyrus bretschneideri Rehd. cv. Yuluxiangli)

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Abstract

Pear (Pyrus spp.) belongs to the genus Pyrus, in the family Rosaceae. Some varieties of pear fruit exhibit bulged surface, which seriously affects the quality and commodity value of the pear fruit. In this study, we performed anatomical, physiological, and transcriptomic analysis to explore the mechanism of paclobutrazol (PBZ) on the bulged surface of pear fruit. The vascular bundles of flesh were more evenly distributed, and the fruit cells were more compactly arranged and smaller in size treated with PBZ. However, the auxin (IAA) content of flesh was decreased in the treated group. Furthermore, the GO and KEGG analysis of differentially expressed genes (DEGs) showed that auxin, phenylpropanoid metabolic pathways, and transcriptional factor genes were significantly enriched on the relieved bulged surface of pear fruit. And it was analyzed that some genes contained auxin responded cis-elements from the selected DEGs in the promoter region. We conclude that PBZ plays a negative role in cell division, cell elongation, and vascular bundle development on the bulged surface of pear fruit through the involvement of auxin-related genes. This study will provide a theoretical basis for the regulation of the bulged surface of pear fruit by a growth retardant agent.

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Availability of data and materials

The datasets used and analyzed during the above research are available from the Additional file or corresponding author. The pear genome datasets used during the current study are available on the website(http://gigadb.org). The RNA-seq data were deposited in the NCBI bio project (https://www.ncbi.nlm.nih.gov/bioproject/) under accession number PRJNA627328.

Abbreviations

IAA:

Auxin

GH3:

Gretchen hagen3

KEGG:

Kyoto Encyclopedia of Genes and Genomes

PBZ:

Paclobutrazol

PK:

Paclobutrazol treatment

CK:

DdH2O treatment

DEGs:

Differentially expressed genes

PIN:

Pin-formed 1

AUX:

Auxin influx carrier

COMT:

Caffeic acid 3-O-methyltransferase

4CL:

4-Coumarate-CoA ligase 1

CYP73A2:

Cytochrome P450 73A2

CSE:

Caffeoyl shikimate esterase

NAC:

Domain-containing protein 2

DOF4.6:

Dof zinc finger protein

CesA:

Cellulose synthase A

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Funding

This work was supported in part by grants from the National Key R&D Program of China (2018YFD0201407), Excellent Ph.D. Reward Project Fund of Shanxi Province (SXYBKY201736), and Key Research and Development (Agriculture) Program of Shanxi Province (201703D211011-2). These fundings provided the financial support to the research projects but did not contain project design, data collection, analysis, or preparation of the manuscript.

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Contributions

LL planned and designed the research.YH guided and supported this research. BD collected the plant materials, performed the experiment, analyzed the data, interpreted results, and wrote the manuscript.TL revisied the language and checked the exprimental data. CH and TC contributed to sample data collection. YS analyzed the part of data. RH and XF provided suggestions in drafting the manuscript and edited the manuscript. All the authors have read and approved the final manuscript.

Corresponding authors

Correspondence to Youzhi Han or Liulin Li.

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This article did not include any experiments with human participants or animals performed by all the authors.

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Additional file 1

: Fig. S1. Graph of the bulged surface of pear fruit at the different development stages.The bulged surface of pear fruit at the early, middle and late stage of fruit.

Additional file 2

: Fig. S2. Differentially expressed vol diagram. The Y-axis shows the log2 FPKM values, FPKM (Fragments Per Kilobase of exon model per Million mapped reads) values, X-axis shows log2 fold change. Red, green and black indicate up, down and unchanged expression, respectively (Fold change≥1,p-value<0.05).

Additional file 3

: Table S1. Statistics of differentially expressed genes in response to PBZ.

Additional file 4

: Table S2. The number of differential expressions annotated genes in the database.

Additional file 5

: Table S3. The list of differentially expressed genes.

Additional file 6

: Table S4. The list genes of GO enrichment.

Additional file 7

: Table S5. The list of genes enriched on the KEGG pathway.

Additional file 8

: Table S6. Identification genes involved in the bulged surface of pear fruit.

Additional file 9

: Table S7 Primers used to perform qRT-PCR of selected candidate genes.

Additional file 10

: Table S8. Quantitative RT-PCR method.

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Ding, B., Liu, T., Hu, C. et al. Comparative analysis of transcriptomic profiling to identify genes involved in the bulged surface of pear fruit (Pyrus bretschneideri Rehd. cv. Yuluxiangli). Physiol Mol Biol Plants 27, 69–80 (2021). https://doi.org/10.1007/s12298-021-00929-z

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