Abstract
Peanut is one of the most valuable legumes, grown mainly in arid and semi-arid regions, where its production may be hindered by the lack of water. Therefore, breeding drought tolerant varieties is of great importance for peanut breeding programs around the world. Unlike cultivated peanuts, wild peanuts have greater genetic diversity and are an important source of alleles conferring tolerance/resistance to abiotic and biotic stresses. To decipher the transcriptome changes under drought stress, transcriptomics of roots of highly tolerant Arachis duranensis (ADU) and moderately susceptible A. stenosperma (AST) genotypes were performed. Transcriptome analysis revealed an aggregate of 1465 differentially expressed genes (DEGs), and among the identified DEGs, there were 366 single nucleotide polymorphisms (SNPs). Gene ontology and Mapman analyses revealed that the ADU genotype had a higher number of transcripts related to DNA methylation or demethylation, phytohormone signal transduction and flavonoid production, transcription factors, and responses to ethylene. The transcriptome analysis was endorsed by qRT-PCR, which showed a strong correlation value (R2 = 0.96). Physio-biochemical analysis showed that the drought-tolerant plants produced more osmolytes, ROS phagocytes, and sugars, but less MDA, thus attenuating the effects of drought stress. In addition, three SNPs of the gene encoding transcription factor NFAY (Aradu.YE2F8), expansin alpha (Aradu.78HGD), and cytokinin dehydrogenase 1-like (Aradu.U999X) exhibited polymorphism in selected different genotypes. Such SNPs could be useful for the selection of drought-tolerant genotypes.
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Abbreviations
- ABA:
-
Abscisic Acid
- ABFs:
-
ABA response element-binding factors
- APX:
-
Ascorbate Peroxidase
- CAT:
-
Catalase
- cDNA:
-
Complementary DNA
- DEGs:
-
Differentially expressed genes
- DGRs:
-
Drought Response Genes
- DHAR:
-
Dehydroascorbate Reductase
- EL:
-
Electrolytic Leakage
- FDR:
-
False Discovery Rate
- FPKM:
-
Fragments per kb per million fragments
- GLCAKG:
-
Glucosyluronic Acid Kinase
- GO:
-
Gene Ontology
- GPX:
-
Glutathione Peroxidase
- GSH:
-
Reduced Glutathione
- KEGG:
-
Kyoto Encyclopedia of Genes and Genomes
- MDA:
-
Malondialdehyde
- NCBI:
-
National Center for Biotechnology Information
- OP:
-
Osmotic Potential
- PAL:
-
Phenylalanine Ammonia Lyase
- POX:
-
Peroxidase
- PP2C:
-
Protein Phosphatase 2C
- qRT-PCR:
-
Quantitative real-time PCR
- RNA-seq:
-
RNA sequence
- ROS:
-
Reactive Oxygen Species
- RWC:
-
Relative Water Content
- SA:
-
Salicylic Acid
- SNRK2:
-
SNF1-related kinase
- SOD:
-
Superoxide Dismutase
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Acknowledgements
We acknowledge the ICAR Directorate of Groundnut Research, Junagadh, Gujarat, India, for providing wild-type peanut seeds and also the Department of Biotechnology, Junagadh Agricultural University, Junagadh (Gujarat) for providing the resources, laboratory facilities and infrastructure required for the experiments.
Funding
This study is funded by the Department of Agricultural Biotechnology, Junagadh Agricultural University, Junagadh, Gujarat.
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FJ: sample collection, executed laboratory procedures of the project, and prepared the initial draft of the manuscript; RH: project administration, performed data analysis, data visualization, diagram preparation, as well as writing, review, and editing the manuscript; ZGH: assisted in improving the manuscript and data analysis as well as diagram preparation; AV: guided throughout the experiment: MJ: executed laboratory procedures of the project.
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Highlights
• Transcriptome analysis revealed an aggregate of 1,465 DEGs and among the identified DEGs there were 366 single nucleotide polymorphisms (SNPs).
• These DEGs were mostly involved in DNA methylation or demethylation, phytohormone signal transduction, and flavonoid production.
• The bHLH, NAC, and WRKY transcription factor families were the most overexpressed TFs respectively, indicating that, these TFs most likely played an important role in dealing with water deficiency stress in plants.
• Three SNPs of the gene encoding transcription factor NFAY (Aradu.YE2F8), expansin alpha (Aradu.78HGD) and cytokinin dehydrogenase 1-like (Aradu.U999X) exhibited polymorphism in the different selected genotypes.
• Twenty unigenes involved in responses to drought stress were validated using qRT-PCR.
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Thoppurathu, F.J., Ghorbanzadeh, Z., Vala, A.K. et al. Unravelling the treasure trove of drought-responsive genes in wild-type peanut through transcriptomics and physiological analyses of root. Funct Integr Genomics 22, 215–233 (2022). https://doi.org/10.1007/s10142-022-00833-z
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DOI: https://doi.org/10.1007/s10142-022-00833-z