Abstract
Expression pattern of aluminum (Al) tolerance genes is one of the major determinants of Al avoidance/tolerance within plant cultivars. We have performed transcriptome analysis of two contrasting (Al-tolerant, Disang; Al-sensitive, Joymati) cultivars of India’s North Eastern region, an indica rice diversity hotspot, on exposure to excess Al3+ treatment in acidic condition. Co-expression analysis and SNPs enrichment analysis proposed the role of both trans-acting and cis-acting polymorphisms in Al signaling in the Al-tolerant cultivar. We proposed ten major genes, including arginine decarboxylase, phytase, and beta-glucosidase aggregating factor as candidates responsible for Al tolerance based on transcriptome analysis. Al3+ stress led to changes in the alternative splicing profile of the Al-tolerant cultivar. These studies demonstrated the transcriptional variations affiliated to Al avoidance/tolerance in contrasting indica rice of North East India and provided us with several candidate genes responsible for Al tolerance.
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Data availability
The datasets used and examined in the course of current study are available online in NCBI SRA database accession PRJNA675468 (https://www.ncbi.nlm.nih.gov/sra/PRJNA675468)
Abbreviations
- Al:
-
Aluminum
- SNPs:
-
Single nucleotide polymorphism
- RNA-Seq:
-
mRNA sequencing
- DR:
-
Disang rice
- JR:
-
Joymati rice
- FPKM:
-
Fragments per kilobase per million
- IR:
-
Intron retention
- AA:
-
Alternate 3′-acceptor
- AD:
-
Alternate 5′-donor
- ES:
-
Exon skip**
- DEGs:
-
Differentially expressed genes
- GO:
-
Gene ontology
- SEA:
-
Singular enrichment analysis
- ELP:
-
Expression level polymorphism
- AS:
-
Alternative splicing
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Acknowledgments
The authors sincerely thank the Regional Agricultural Research Station, Akbarpur (Karimganj), India, and Regional Rainfed Lowland Rice Research Station (RRLRRS) Gerua, Guwahati, Assam, India, for providing us with rice seeds. BS acknowledges the Science Education and Research Board (SERB) for National Post-Doctoral Fellowship (PDF/2018/003216).
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S.K.P and H.K conceived and designed the study. J.P.A and B.S performed experimental works. K.K and Y.K performed RNA-Seq data processing, transcriptome analysis, and interpretation of the data. K.K, J.P.A, B.S, and S.K.P wrote the manuscript. All authors read and approved the final manuscript.
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Awasthi, J.P., Kusunoki, K., Saha, B. et al. Comparative RNA-Seq analysis of the root revealed transcriptional regulation system for aluminum tolerance in contrasting indica rice of North East India. Protoplasma 258, 517–528 (2021). https://doi.org/10.1007/s00709-020-01581-2
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DOI: https://doi.org/10.1007/s00709-020-01581-2