Transcription factor OsbZIP10 modulates rice grain quality by regulating OsGIF1

Area of Science:

• Plant Molecular Biology
• Agricultural Science
• Genetics

Background:

• Optimizing rice (Oryza sativa L.) grain filling is crucial for seed yield and quality.
• Transcription factors (TFs) are key regulators of gene networks during grain filling.
• Understanding upstream regulators of key grain filling genes like OsGIF1 is essential.

Purpose of the Study:

• To identify transcription factors regulating the rice grain filling gene OsGIF1.
• To investigate the role of OsbZIP10 in rice grain filling and quality.
• To explore the genetic variation of OsbZIP10 and its association with grain quality traits.

Main Methods:

• Gene knockout and overexpression in rice.
• Multi-omics analyses (transcriptomics, proteomics, etc.).
• Haplotype analysis and association studies.

Main Results:

• OsbZIP10 acts as a transcriptional activator of OsGIF1.
• OsbZIP10 knockout lines exhibit altered grain filling, reduced amylose content (AC), and improved eating/cooking quality.
• OsbZIP10 targets multiple genes involved in grain filling, including OsAGPS1 and reactive oxygen species homeostasis.
• Distinct OsbZIP10 haplotypes in japonica and indica rice are associated with AC, and haplotype manipulation can alter AC.

Conclusions:

• The OsbZIP10-OsGIF1 module is significant for determining rice grain quality.
• OsbZIP10 plays a vital role in regulating grain filling and quality traits.
• Genetic engineering of OsbZIP10 offers a potential strategy for developing rice with tailored seed attributes.