Transcriptome Analyses in a Selected Gene Set Indicate Alternative Oxidase (AOX) and Early Enhanced Fermentation as...

Area of Science:

• Plant Biology
• Molecular Biology
• Genetics

Background:

• Plants require rapid acclimation to survive environmental stress.
• Salt stress significantly impacts crop yield and necessitates understanding plant molecular responses.
• Early cellular reprogramming mechanisms are vital for stress tolerance in plants.

Purpose of the Study:

• To investigate genes involved in early cell reprogramming in rice under salt stress.
• To compare molecular responses between a salt-tolerant (Pokkali) and a salt-susceptible (IR29) rice genotype.
• To elucidate early molecular mechanisms underlying rice salinity tolerance.

Main Methods:

• Analysis of transcriptomic data for selected genes within 24 hours of salt exposure.
• Evaluation of genes involved in ROS avoidance, ATP production, and antioxidant systems.
• Comparison of gene expression patterns between contrasting rice genotypes.

Main Results:

• The salt-tolerant genotype (Pokkali) showed higher AOX (ROS balancing) and ADH (alcohol fermentation) gene expression.
• The salt-susceptible genotype (IR29) exhibited higher UCP and PTOX transcript levels, indicating increased oxidative stress.
• Pokkali upregulated genes in the AsA-GSH cycle for ascorbate recovery, while IR29 showed early but ineffective antioxidant responses.

Conclusions:

• AOX and ADH play critical roles in early cell reprogramming for salt stress tolerance by controlling mitochondrial ROS.
• Early and efficient ROS management is key to conferring salinity tolerance in rice.
• Findings support gene engineering strategies for developing salt-tolerant rice varieties.