Functional Genomics of Sulfur Metabolism in Rice: Insights From Transgenic and MicroRNA-Based Strategies

Area of Science:

• Plant Biology
• Molecular Genetics
• Agricultural Science

Background:

• Sulfur (S) is an essential macronutrient crucial for plant growth, redox homeostasis, stress adaptation, and immunity.
• Sulfur deficiency is a growing concern in rice (Oryza sativa) cultivation, necessitating a deeper understanding of its metabolic regulation.

Purpose of the Study:

• To synthesize current knowledge on sulfur metabolism in rice, focusing on functional genomics and transgenic approaches.
• To elucidate the roles of sulfate transporters, assimilation enzymes, and metabolites in sulfur homeostasis and stress responses.
• To highlight the significance of the miR395 regulatory module in coordinating sulfur assimilation and allocation.

Main Methods:

• Review of recent advances in functional genomics, including transgenic and microRNA-based studies.
• Analysis of gene functions related to sulfur uptake, transport, and assimilation.
• Examination of sulfur-containing metabolites like glutathione and their regulatory roles.

Main Results:

• Sulfur metabolism is intricately linked with redox signaling, stress tolerance, and plant immunity in rice.
• The miR395 regulatory module plays a conserved role in posttranscriptional regulation of ATP sulfurylase genes, controlling sulfur assimilation.
• Sulfur metabolism functions as a dynamic regulatory network, not merely a linear pathway.

Conclusions:

• Functional genomics provides critical insights into sulfur metabolism, its integration with plant defense, and its impact on stress resilience.
• Further research into sulfur metabolism is essential for enhancing sulfur use efficiency and developing sustainable rice production strategies.