RAPD analysis of jasmine rice-specific genomic structure

Area of Science:

• Plant genetics
• Molecular biology
• Agricultural science

Background:

• Jasmine rice (Oryza sativa L. subsp indica) is a popular aromatic rice variety.
• Understanding its genomic structure is crucial for breeding and conservation efforts.
• Previous studies have explored rice genetics, but specific genomic markers for jasmine rice require further investigation.

Purpose of the Study:

• To analyze the genomic structure specific to jasmine rice using random amplified polymorphic DNA (RAPD) markers.
• To evaluate genetic distances and construct a phylogenetic tree for various rice varieties, including jasmine rice.
• To identify specific DNA fragments that distinguish jasmine rice from other rice types.

Main Methods:

• Genomic DNA extraction from 29 rice seed samples, encompassing jasmine rice, its derivatives, nonaromatic Thai rice, and japonica rice.
• Random Amplified Polymorphic DNA (RAPD) profiling to assess polymorphism and genetic diversity.
• Phylogenetic analysis based on band sharing to construct a genetic relationship tree.
• Cloning, sequencing, and specific primer-based PCR amplification of unique RAPD fragments.

Main Results:

• RD15, CNTLR85033, and CNT87040 showed the closest genetic proximity to 'KDML105' jasmine rice.
• Four RAPD fragments were identified as key markers distinguishing jasmine rice from other varieties.
• Sequencing revealed a 454 bp fragment similar to a putative Cf2/Cf5 disease resistance gene intron and a 1,107 bp fragment similar to a wall-associated kinase (wak) gene sequence.
• Specific primer PCR confirmed the reliability of the RAPD findings.

Conclusions:

• RAPD analysis effectively elucidated the genomic structure of jasmine rice.
• The identified DNA fragments provide valuable molecular markers for jasmine rice identification and breeding.
• The similarity of identified fragments to disease resistance and kinase genes suggests potential functional roles in jasmine rice.