Genetic diversity in soybean genotypes using phenotypic characters and enzymatic markers

Area of Science:

• Agronomy
• Plant Breeding
• Genetics

Background:

• Understanding genetic diversity is crucial for effective soybean breeding programs.
• Phenotypic traits and enzymatic markers provide complementary insights into genetic variation.
• Assessing diversity across different technology levels (e.g., RR, IPRO) informs breeding strategies.

Purpose of the Study:

• To evaluate the genetic diversity of soybean cultivars using phenotypic and enzymatic markers.
• To determine the relative contribution of agronomic traits to genetic divergence.
• To analyze diversity in relation to technological advancements (RR, IPRO) and breeding programs.

Main Methods:

• Field experiments evaluated agronomic traits: grain yield, plant height, lodging, etc.
• Enzymatic markers (dehydrogenase alcohol, esterase, SOD, peroxidase) were analyzed via electrophoresis.
• Genetic diversity was assessed using Euclidean distance, Jaccard coefficient, and UPGMA clustering.

Main Results:

• Phenotypic data grouped cultivars into two clusters, with cultivar 97R73 RR being distinct.
• Grain yield was the primary contributor (>90%) to genetic divergence.
• Enzymatic markers resulted in six distinct groups, differentiating cultivars like CG 8166 RR, FPS Jupiter RR, and BRS MG 780 RR.
• Cultivars with RR technology exhibited greater genetic divergence compared to conventional and IPRO types.

Conclusions:

• Phenotypic traits, particularly grain yield, are significant indicators of genetic diversity in soybean.
• Enzymatic markers offer higher resolution for discriminating soybean genotypes.
• The RR technology is associated with increased genetic divergence, suggesting its impact on breeding pools.