The Wx/SSIIa and GS3/GW7 Alleles, Both Individually and in Combination, Can Significantly Distinguish Rice Germplasm...

Area of Science:

• Agricultural Science
• Plant Genetics
• Food Science

Background:

• Rising living standards increase demand for high-quality rice.
• Understanding gene interactions is crucial for improving rice quality traits.

Purpose of the Study:

• To investigate the effects of major grain quality genes on rice appearance and eating quality.
• To develop and apply allele-specific markers for stacking desirable gene alleles.

Main Methods:

• Developed five allele-specific markers for Waxy (Wx), Starch synthase II-a (SSIIa), grain size 3 (GS3), and grain width 7 (GW7) genes.
• Stacked desirable alleles at these loci in 156 rice germplasm.
• Evaluated the effects of individual and combined alleles on quality traits.

Main Results:

• Wx-In1 significantly impacts amylose content and gel consistency; SSIIa-Ex8 primarily affects alkali spreading value.
• Chalkiness is influenced by Wx-In1 > SSIIa-Ex8 > Wx-Ex10.
• GS3-Ex2 significantly impacts chalkiness and synergizes with GW7-Pro; GW7-Pro influences amylose content.

Conclusions:

• Allele-specific markers facilitate stacking desirable genes for enhanced rice quality.
• Specific gene loci have distinct and synergistic effects on rice quality traits.
• This research provides a foundation for marker-assisted breeding to improve rice quality.