Genetic diversity in cultivated groundnut based on SSR markers

Area of Science:

• Agricultural Science
• Genetics
• Plant Breeding

Background:

• Peanut (Arachis hypogaea L.) is a vital crop for edible oil and protein.
• Identifying genetic diversity in peanut resources is crucial for cultivar development and accession evaluation.

Purpose of the Study:

• To assess the genetic variation within and among four botanical varieties of cultivated peanut.
• To evaluate the effectiveness of SSR markers in discriminating peanut accessions and understanding genetic differentiation.

Main Methods:

• Utilized thirty-four SSR markers to analyze genetic variation in 96 peanut accessions (24 per variety).
• Assessed polymorphism levels, calculated genetic differentiation indices, and determined intra-variety genetic distances.
• Constructed dendrograms based on genetic distances to visualize relationships among varieties.

Main Results:

• Ten to sixteen SSR primer pairs exhibited polymorphism among the tested accessions.
• A high maximum differentiation index (0.992) indicated significant genetic differentiation.
• Intra-variety genetic distances varied, with var. fastigiata showing the highest average (0.59) and var. hirsuta the lowest (0.17).

Conclusions:

• Abundant intra-variety SSR polymorphism exists in cultivated peanut.
• SSR markers are effective for discriminating individual peanut accessions.
• The findings support the feasibility of developing genetic maps and implementing marker-assisted selection for peanut improvement.