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Analysis of drought-responsive signalling network in two contrasting rice cultivars using transcriptome-based
Pratikshya Borah1, Eshan Sharma2, Amarjot Kaur2
1Interdisciplinary Centre for Plant Genomics, University of Delhi South Campus, New Delhi - 110021, India.
Scientific Reports
|February 10, 2017
Summary
Indian rice cultivars possess natural drought tolerance. This study identifies key genes and pathways in drought-tolerant rice, Dhagaddeshi, offering insights for crop improvement.
Area of Science:
- Plant Biology
- Genetics
- Agricultural Science
Background:
- Traditional Indian rice cultivars display inherent drought tolerance.
- Genetic variations contribute to this resilience, crucial for food security.
Purpose of the Study:
- To compare physiological and transcriptome differences between drought-tolerant (Dhagaddeshi, DD) and susceptible (IR20) rice cultivars under drought stress.
- To identify candidate genes and molecular pathways involved in drought tolerance.
Main Methods:
- Microarray analysis to identify differentially expressed genes (DEGs) in DD vs. IR20 under drought.
- Physiological assessments including cell membrane stability and abscisic acid (ABA) accumulation.
- Bioinformatic analysis of metabolic pathways and co-localization of DEGs with quantitative trait loci (QTLs).
- Quantitative PCR (qPCR) for gene expression validation and functional validation of OsFBK1.
Main Results:
- DD exhibited higher cell membrane stability and differential ABA accumulation compared to IR20.
- Microarray identified unique DEGs in DD under drought stress.
- Analysis revealed interplay of ABA-dependent, secondary, and redox metabolic networks in DD.
- Candidate genes, including those linked to qDTY1.1, were identified.
- Previously uncharacterized genes (OsWRKY51, OsVP1) and OsFBK1 were identified and validated for drought tolerance.
Conclusions:
- Drought tolerance in DD involves complex interactions of ABA signaling, osmotic adjustment, and detoxification pathways.
- Identified candidate genes, particularly those linked to known QTLs, hold potential for marker-assisted breeding in rice.
- Functional validation of OsFBK1 demonstrates its role in enhancing drought tolerance across different rice cultivars and in Arabidopsis.
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