Development of a Brazilian maize core collection

Area of Science:

• Agriculture
• Genetics
• Plant Breeding

Background:

• Developing a core collection is crucial for efficient management and utilization of maize genetic resources.
• Brazilian maize collections require optimized sampling strategies to capture maximum genetic diversity.

Purpose of the Study:

• To evaluate different methods for developing a Brazilian maize core collection.
• To identify the most efficient sampling strategy for maximizing genetic diversity within the collection.

Main Methods:

• Survey of active maize collection using passport information, characterization, and evaluation data.
• Division of accessions by geographic region and kernel type.
• Evaluation of multiple sampling methods, including constant sampling and a multivariate strategy (dispersion graphs, principal components, Tocher method).

Main Results:

• Constant sampling significantly altered accession frequency.
• The multivariate strategy proved efficient in identifying divergent genotypes.
• The multivariate strategy induced greater alterations in trait variance, irrespective of sampling intensity.

Conclusions:

• The multivariate sampling strategy is effective for developing a Brazilian maize core collection.
• The active maize collection contains satisfactory genetic information.
• Optimized sampling enhances the utility of maize genetic resources for breeding programs.