Inheritance of RAPDs in F1 hybrids of corn.

Area of Science:

• Plant genetics
• Molecular markers
• Corn breeding

Background:

• Random amplified polymorphic DNA (RAPD) markers are widely used in plant genetics.
• Understanding genetic variation in corn (Zea mays) is crucial for breeding programs.
• Diallel analysis provides insights into the genetic control of traits.

Purpose of the Study:

• To analyze genetic polymorphism using RAPD markers in corn F1 hybrids and their parental inbreds.
• To evaluate the inheritance patterns of RAPD fragments in corn.
• To assess the reliability and applicability of RAPD analysis in corn genetics.

Main Methods:

• Analysis of 16 corn F1 hybrids and five parental inbreds using a partial diallel design.
• Scoring of 140 DNA fragments generated by 21 random primers.
• Categorization of fragments into nonpolymorphic, unambiguously polymorphic (presence/absence), and quantitatively polymorphic (intensity variation).

Main Results:

• Out of 140 fragments, 20.7% were nonpolymorphic, 37.1% unambiguously polymorphic, and 42.1% quantitatively polymorphic.
• Complete dominance was observed in 95.2% of unambiguous polymorphisms and 88.1% of quantitative polymorphisms in F1 hybrids.
• Partial dominance was detected in 3.2% of unambiguous and 5.0% of quantitative polymorphisms.

Conclusions:

• RAPD analysis can detect specific types of experimental errors.
• Uniparental inheritance appears to be infrequent in the studied corn genotypes.
• The application of RAPD analysis in corn genetics should be carefully considered based on its specific uses.