Identification and characterization of Capsicum mutants using, biochemical, physiological, and single sequence repeat...

Area of Science:

• Plant genetics and breeding
• Agricultural science
• Molecular biology

Background:

• Mutation breeding is crucial for developing desirable crop traits.
• Chemically induced mutagenesis offers a method to generate genetic variation.
• Understanding macromolecular variations in induced mutants is key for crop improvement.

Purpose of the Study:

• To identify and characterize crop mutants with altered traits using molecular markers.
• To assess the genetic diversity and potential of induced mutants in Capsicum annuum L.
• To evaluate the utility of these mutants in mutation breeding programs.

Main Methods:

• Induced mutagenesis using alkylating agents and heavy metals.
• Morphological, quantitative, and biochemical trait analysis.
• Molecular marker analysis including Single Sequence Repeats (SSRs).
• Statistical analyses: Unweighted Pair Group Arithmetic Mean Method (UPGMA), Correlation, Principal Component Analysis (PCA), and Hierarchical Cluster Analysis (HCA).

Main Results:

• Chemically induced mutagenesis generated mutants with altered morphological, quantitative, and biochemical traits.
• Mutant lines showed enhanced mean values in quantitative traits and useful mutations in phytochemicals and nutrient profiles.
• SSR analysis revealed significant genetic diversity among mutant lines, with 44 alleles observed.
• UPGMA, PCA, and HCA demonstrated genetic divergence and heterogeneity among mutants, with specific pairings showing maximum and minimum dissimilarity.

Conclusions:

• Induced beneficial mutations can enhance genetic variability in chili genotypes.
• Mutant lines exhibit potential for crop improvement programs by broadening the genetic base of Capsicum annuum L.
• The developed mutants are suitable for indirect selection in breeding programs due to demonstrated genetic diversity.