Genetic Diversity among Tropical Provitamin A Maize Inbred Lines and Implications for a Biofortification Program

Area of Science:

• Plant genetics
• Agricultural science
• Maize breeding

Background:

• Understanding genetic diversity in elite breeding materials is crucial for effective maize improvement.
• Provitamin A biofortification in maize aims to enhance nutritional value and address vitamin A deficiency.

Purpose of the Study:

• To assess the genetic diversity and relationships among 63 inbred lines selected for high provitamin A content.
• To inform parent selection strategies for current and future maize biofortification breeding programs.

Main Methods:

• Genotyping of 63 maize inbred lines using 137 single nucleotide polymorphism (SNP) markers.
• Analysis of genetic diversity, genetic distance, kinship, and population structure.

Main Results:

• Detected 272 alleles with a gene diversity of 0.36.
• Average genetic distance was 0.36; 56% of line pairs showed distances between 0.30-0.40.
• Population structure analysis identified seven major genetic groups, correlating with pedigree and breeding origin.

Conclusions:

• The majority of provitamin A inbred lines are genetically unique.
• Molecular grouping and pedigree analysis provide valuable insights for selecting parents for hybrid development and future breeding initiatives.