Genetic relationships within the genus Beta determined using both PCR-based marker and DNA sequencing techniques

Area of Science:

• Botany
• Molecular Biology
• Genetics

Background:

• The genus Beta includes wild beet species with complex evolutionary relationships.
• Understanding the phylogeny of wild beets is crucial for conservation and breeding efforts.

Purpose of the Study:

• To infer the phylogeny of 11 wild beet taxa using molecular data.
• To compare the effectiveness of ITS1 sequencing and RAPD analysis in resolving phylogenetic relationships within the genus Beta.

Main Methods:

• DNA was extracted from 11 wild beet species/subspecies across four sections.
• Internal Transcribed Spacer 1 (ITS1) regions of nuclear ribosomal DNA were sequenced.
• Random Amplified Polymorphic DNA (RAPD) analysis was performed on multiple accessions.
• Phenetic and phylogenetic analyses were conducted on both datasets.

Main Results:

• Both ITS1 sequencing and RAPD analysis consistently identified three major groups within the genus Beta.
• Section Beta formed one distinct group.
• Section Procumbentes formed a separate, highly distinct group.
• Sections Nanae and Corollinae clustered together, forming a third group that was phylogenetically closer to section Beta than to section Procumbentes.
• RAPD analysis provided insights into within-section interspecies relationships that aligned with previous findings, whereas ITS1 data did not always show this consistency.

Conclusions:

• ITS1 sequencing and RAPD analysis are valuable tools for elucidating the phylogeny of the genus Beta.
• The study confirms the distinctness of section Procumbentes and the close relationship between sections Nanae and Corollinae.
• Phylogenetic relationships inferred from RAPD data may offer a more detailed view of within-section relationships compared to single-locus ITS1 sequence data in this genus.