Temporal transcriptomic differences between tolerant and susceptible genotypes contribute to rice drought tolerance

Area of Science:

• Plant Science
• Genomics
• Molecular Biology

Background:

• Drought tolerance is crucial for crop survival and involves temporally activated mechanisms.
• Understanding the temporal dynamics of the rice transcriptome under drought stress is limited.

Purpose of the Study:

• To investigate the temporal transcriptomic dynamics in rice genotypes with varying drought tolerance (DT) under field drought conditions.
• To identify key biological processes and genes contributing to drought tolerance in rice.

Main Methods:

• Transcriptomic analysis of 12 rice genotypes under natural drought.
• Differential gene expression analysis to compare tolerant and susceptible genotypes.
• Gene coexpression network analysis to identify hub genes.

Main Results:

• Tolerant rice genotypes exhibited fewer differentially expressed genes (DEGs) with a higher proportion of upregulated DEGs.
• Significant differences in temporally activated biological processes, including metabolism and histone deacetylation, were observed between tolerant and susceptible genotypes.
• A trade-off between drought tolerance and productivity was noted, with tolerant genotypes maintaining a better balance.

Conclusions:

• The study provides insights into the temporal transcriptomic responses of rice to drought.
• Identified specific biological processes and potential hub genes that contribute to enhanced drought tolerance in rice.
• Strengthened system-level understanding of rice drought tolerance mechanisms.