Effect of Fat Content on Rice Taste Quality through Transcriptome Analysis

Area of Science:

• Agricultural Science
• Plant Molecular Biology
• Food Science

Background:

• Lipid content and fatty acid composition in rice grains are crucial for eating quality.
• Understanding the genetic basis of lipid metabolism is essential for rice quality improvement.

Purpose of the Study:

• To investigate the relationship between fat content and eating quality in rice.
• To identify key genes involved in rice lipid metabolism and their impact on eating quality.

Main Methods:

• Development and analysis of 94 homozygous recombination inbred lines (RILs).
• RNA sequencing to identify differentially expressed genes in high-fat (FH) versus low-fat (FL) rice lines.
• Liquid chromatography to quantify fatty acid levels.
• Comparative genomic analysis of candidate genes.

Main Results:

• A positive association was found between fat content and eating quality in rice.
• 619 differentially expressed genes were identified, enriched in metabolic pathways including fatty acid metabolism.
• Genes related to fatty acid synthesis were upregulated, while degradation genes were downregulated in high-fat grains.
• Palmitic and oleic acid levels were significantly higher in FH grains.
• Two genes, Os07g0417200 and Os12g0102100, were identified as key regulators of lipid metabolism and unsaturated fatty acid synthesis.

Conclusions:

• Lipid metabolism significantly influences rice eating quality.
• Os07g0417200 and Os12g0102100 are critical genes for enhancing rice lipid content and improving taste.
• These findings provide a theoretical foundation for breeding rice varieties with improved nutritional and sensory qualities.