Genetic mapping for grain quality and yield-attributed traits in Basmati rice using SSR-based genetic map

Area of Science:

• Plant genetics
• Agricultural science
• Molecular breeding

Background:

• Rice grain quality and shape are crucial for market value and global food demand.
• Improving these traits in Basmati rice requires understanding the genetic basis of kernel elongation and quality.
• Existing genetic information for these traits is limited, necessitating molecular marker approaches.

Purpose of the Study:

• To detect and map quantitative trait loci (QTLs) associated with grain quality and yield in Basmati rice.
• To identify genetic markers for marker-assisted selection (MAS) to enhance kernel elongation and nutritional quality.
• To analyze the genetic inheritance, including epistatic interactions, of these important traits.

Main Methods:

• A recombinant inbred line (RIL) population of 130 lines was developed from a cross between Basmati 370 and Pusa Basmati 1121.
• A genetic map was constructed using 70 polymorphic simple sequence repeat (SSR) markers covering 689.3 cM across 12 rice chromosomes.
• Quantitative trait loci (QTLs) for nine yield and quality traits were mapped using the RIL population.

Main Results:

• A total of 20 QTLs were identified for nine yield and quality traits.
• Significant variation and transgressive segregation were observed for grain quality traits in the RIL population.
• Epistatic interactions were detected for grain quality traits, indicating complex genetic control.

Conclusions:

• The identified QTLs and associated flanking markers provide valuable genetic resources for Basmati rice improvement.
• Marker-assisted selection (MAS) can be effectively employed using this information to enhance kernel elongation and nutritional grain quality.
• This study contributes to a deeper understanding of the genetic architecture underlying important rice grain traits.