Genome-Wide Association Study and Candidate Gene Identification for Girth Traits in Rubber Tree

Area of Science:

• Plant Genetics
• Tree Physiology
• Agricultural Science

Background:

• Rubber tree (Hevea brasiliensis) girth is crucial for economic value and latex production.
• Existing genetic knowledge is insufficient for effective molecular breeding programs targeting girth.

Purpose of the Study:

• Identify genetic loci and candidate genes associated with rubber tree girth.
• Provide theoretical support for genetic enhancement of rubber tree growth traits.

Main Methods:

• Phenotypic data analysis
• Population genetic structure analysis
• Genome-wide association analysis (GWAS) on 138 rubber tree accessions

Main Results:

• Identified 7 and 23 significant SNPs associated with girth.
• Discovered 27 candidate genes, including 4 directly related to girth.
• GO and KEGG analyses revealed involvement in metabolic regulation, signal transduction, and biosynthesis pathways.

Conclusions:

• Novel SNP markers and genes identified complement existing genetic resources.
• Findings refine breeding strategies for elite rubber tree genotype selection.
• Contributes to enhanced rubber production through genetic improvement.