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Genomic survey of high-throughput RNA-Seq data implicates involvement of long intergenic non-coding RNAs (lincRNAs) in cytoplasmic male-sterility and fertility restoration in pigeon pea

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Abstract

Background

Long-intergenic non-coding RNAs (lincRNAs) originate from intergenic regions and have no coding potential. LincRNAs have emerged as key players in the regulation of various biological processes in plant development. Cytoplasmic male-sterility (CMS) in association with restorer-of-fertility (Rf) systems makes it a highly reliable tool for exploring heterosis for producing commercial hybrid seeds. To date, there have been no reports of lincRNAs during pollen development in CMS and fertility restorer lines in pigeon pea.

Objective

Identification of lincRNAs in the floral buds of cytoplasmic male-sterile (AKCMS11) and fertility restorer (AKPR303) pigeon pea lines.

Methods

We employed a computational approach to identify lincRNAs in the floral buds of cytoplasmic male-sterile (AKCMS11) and fertility restorer (AKPR303) pigeon pea lines using RNA-Seq data.

Results

We predicted a total of 2145 potential lincRNAs of which 966 were observed to be differentially expressed between the sterile and fertile pollen. We identified, 927 cis-regulated and 383 trans-regulated target genes of the lincRNAs. Gene Ontology (GO) and Kyoto Encyclopedia of Genes and Genomes (KEGG) enrichment analysis of the target genes revealed that these genes were specifically enriched in pathways like pollen and pollen tube development, oxidative phosphorylation, etc. We detected 23 lincRNAs that were co-expressed with 17 pollen-related genes with known functions. Fifty-nine lincRNAs were predicted to be endogenous target mimics (eTMs) for 25 miRNAs, and found to be associated with pollen development. The, lincRNA regulatory networks revealed that different lincRNA-miRNA-mRNA networks might be associated with CMS and fertility restoration.

Conclusion

Thus, this study provides valuable information by highlighting the functions of lincRNAs as regulators during pollen development in pigeon pea and utilization in hybrid seed production.

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Data availability

Publically available datasets were analyzed in this study. This data can be found here: National Centre for Biotechnology Information (NCBI) SRA database (SRX3740150, SRX3740151, SRX3740153 and SRX3740152). Following is the reviewer’s link as generated by NCBI http://www.ncbi.nlm.nih.gov/sra/SRX3740153[accn]; http://www.ncbi.nlm.nih.gov/sra/SRX3740152[accn]; http://www.ncbi.nlm.nih.gov/sra/SRX3740151[accn]; http://www.ncbi.nlm.nih.gov/sra/SRX3740150[accn].

Abbreviations

AL:

ALFIN-LIKE

ARF:

Auxin responsive factor

BG:

β-Glucosidase

bp:

Base pair

cDNA:

Complementary DNA

CMS:

Cytoplasmic male-sterility

CNCI:

Coding non-coding index

COG:

Clusters of Orthologous Groups

COLDAIR:

Cold assisted intronic noncoding RNA

COOLAIR:

Cold induced long antisense intragenic RNA

CPC:

Coding potential calculator

DE:

Differentially expressed

EMS:

Excess microsporocytes

ERF:

Ethylene-responsive factor

eTMs:

Endogenous target mimics

FC:

Fold change

FDR:

False discovery rate

FLC:

Flowering locus C

FPKM:

Fragments per kilo base per million

GMS:

Genic male-sterility

GNL1:

GNOM-LIKE1

GNL2:

GNOM-LIKE2

GO:

Gene Ontology

GST:

Glutathione S-transferase

IPS1:

Induced by phosphate starvation

KEGG:

Kyoto encyclopedia of genes and genomes

LDMAR:

Long day specific male fertility associated RNA

lincRNA:

Long-intergenic non-coding RNAs

lncRNAs:

Long non-coding RNAs

LRR-RPK:

Leucine-rich repeat receptor protein kinase

miRNAs:

MicroRNAs

NCBI:

National centre for biotechnology information

ncRNAs:

Non-coding RNAs

Nr:

NCBI non-redundant protein

nt:

Nucleotide(s)

ORF:

Open reading frame

PCR:

Polymerase chain reaction

PHD:

Plant HomeoDomain

pol II:

RNA polymerase II

pol III:

RNA polymerase III

pol IV:

RNA polymerase IV

pol V:

RNA polymerase V

PPR:

Pentatricopeptide-repeat protein

qRT-PCR:

Quantitative real-time PCR

Rbohs:

Respiratory burst oxidase homologs

Rf:

Restorer-of-fertility

ROS:

Reactive oxygen species

rRNAs:

Ribosomal RNAs

siRNAs:

Small interfering RNAs

sncRNAs:

Small non-coding RNAs

snoRNAs:

Small nucleolar RNAs

SPL:

Squamosa promoter-binding-like

TF's:

Transcription factors

tRNAs:

Transfer RNAs

UBC:

Ubiquitin-conjugating enzyme

References

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Acknowledgements

The authors are grateful to the Director, ICAR- National Institute for Plant Biotechnology (NIPB), New Delhi, India for providing the facilities. The authors also thank the other members of our research groups and collaborators for technical assistance and discussions.

Funding

This work was supported by grants from Department of Science & Technology (DST), New Delhi, India under Women Scientist Scheme-A (WOS-A) and ICAR-National Institute for Plant Biotechnology, New Delhi, India.

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Authors and Affiliations

Authors

Contributions

SS: methodology, formal analysis, investigation, fund acquisition and writing (original draft). AD: methodology, software, formal analysis, reviewing and editing. TK: reviewing and editing. GR: resources. SS: reviewing and editing. KG: conceptualization, methodology, funding acquisition and supervision. All authors read and approved the final manuscript.

Corresponding author

Correspondence to Kishor Gaikwad.

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The authors declare that they have no competing financial interests to declare.

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Saxena, S., Das, A., Kaila, T. et al. Genomic survey of high-throughput RNA-Seq data implicates involvement of long intergenic non-coding RNAs (lincRNAs) in cytoplasmic male-sterility and fertility restoration in pigeon pea. Genes Genom 45, 783–811 (2023). https://doi.org/10.1007/s13258-023-01383-9

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